Eric, You are one of the best there is. Awesome vid. I have a question. My 2000 Honda city, 1.5exi has been misfiring very much when it gets heated up. Only 3 injectors are firing. Spark plugs, plug wires, fuel filter, fuel tank replaced, no luck. Ecu says no trouble codes. Could it be the main relay. Yes the car starts without any issues, but there is heavy misfire. Help would be greatly appreciated. :)
Thanks for this video, just did it about 2 hours ago, i tested the pump jumping terminals 5-7 and it was working, got the relay checked and fixed like the video and that's it! Its been like 2 years with this hot day's starting problem, hope this lasts forever.
Anyway, thanks ETCG more videos on ACCORD 90-93 would be great!
Nice tip, but just a tip about soldering - you shouldn't be holding the tip on the part while it warms up (you'll damage the part) and you shouldn't be creating a bead and making it blend down - that's a good way of creating another bad joint that will fail again. Let the iron warm up to full temp, apply it to the pin until it melts the existing solder, then feed more solder into the melt pool (not onto the iron tip). HTH
Hey Eric, just pulled it out (main relay), and noticed that brownish residue. It is especially around one of the soldered points. What is this residue, and does it affect the relay operation? Thanks
Eric, I LOVE YOU!!!! After seeing this video my husband took the relay off my 91 accord and replaced it and it cranked right up! My car has been sitting in the yard for i know six months. Thank you so, so much!
I have a 98 civic dx and its been sitting there for 2 months now, it cranks but doesn't start it never had anything wrong with it, i parked one day in the parking lot then when i came back it wouldn't start!... we changed this, the whole distributor, the rotor, and still nothing... this mechanic came to my house and put this little machine in the fuse things and it gave no codes! he said the starter engine is fine, but the distributor isn't recieving electricity I WANT TO DIIIIEEEEEE!!!! :( :(
I have a 98 civic dx and its been sitting there for 2 months now, it cranks but doesn't start it never had anything wrong with it, i parked one day in the parking lot then when i came back it wouldn't start!... we changed this, the whole distributor, the rotor, and still nothing... this mechanic came to my house and put this little machine in the fuse things and it gave no codes! he said the starter engine is fine, but the distributor isn't recieving electricity I WANT TO DIIIIEEEEEE!!!! :( :(
Thanks Eric this did the trick on my Honda CRX race car. A little bit more info these are called dual relays on old Bosh FI systems, it is the interface between the car and the FI system one relay puts pwr to the fuel pump the other to the ECU (hence Dual relay/main relay) my car had no ecu codes, no spark.
Dude man your a life saver, My car hasn't started for a month and after I saw this video and checked my main relay and wiggled it a bit it started right up. I had cracks in the Main Relay that prevented spark to my car. Keep up the good work man and thanks again for this video.
@EricTheCarGuy Eric please please help.. I have this problem, with my h22 accord. I just did this swap myself. Okay when I put my car in 1st gear it cuts out the all the lights flash and the engine runs like crap and eventually stalls when I let the clutch out more. But when i put it in reverse it has all the power there and no problem. What could this be? Can any one help?!? I checked all grounds they are all tight. I have no clue what the problem is.
I had my accord with a local mechanic for no start for 3 days and they changed "Ignitor" and "Reprogrammed" the key but they could not make it start. Bill was pilling over 300 already and still no start. So, I checked this video and went to the mechanic and told him to check main fuel relay...which I force them to do, then you know what...exactly!!!! - bad main fuel relay it is. Now I have doubt that they charge me for things that I really didn't need. Thanks Eric, you are such a help.
@archetype001 Yea, this is pretty basic and should be common knowledge, not to mention it doesn't sound like they checked for spark or fuel properly, I'd look for another shop.
@EricTheCarGuy Yes, they lied me about checking main fuel relay on phone. So, I'm pretty pissed about that. Definitely I will be looking for other shop next time. Thanks Eric.
You ought to edit the video and add a mention of a flux pen in it. I do tons of hobby electronic repairs and I found that with bad solder joints, get a flux pen and apply a generous amount to the old solder, then simply heat it up and it will rejoin the connection as if you went and removed the old solder and applied new solder. (for those that don't know, flux helps make the solder liquid which is why solder is hollow inside, containing flux)
@MrLagunero15 The only way to know is to check for power and ground at the fuel pump connector itself as you crank the engine, if you have power and ground and the pump doesn't run the pump is bad. FYI OE Honda pumps hardly ever go bad in my experience.
Thanks for video it explains my current situation. Unfortunately my '92 Civic is in the shop as I write this. Had a problem for 7-8 weeks intermittently (start/stall, stall when driving but restart okay). Spent too much money at one garage where they couldn't pinpoint a problem and it continued. Finally went to dealership and they are fixing it but costly. As a female without mechanical background I appreciate your thorough explanation with examples.
@oscarswallow It may not be this relay however as it could also be the electrical portion of the ignition switch that could also cause that symptom. This only works if the car does not have fuel pressure. Thanks for the comment and good luck.
@EricTheCarGuy I think you are right. Honda said they fixed the problem but less than a week later the problem returned. Brought it back to dealership and now they say the diagnostics for older models aren't as accurate as newer models but it could be ignitor problem, distributor (had that replaced at that dealership in Sept. 2010 so no longer under warranty), or an ECU issue but Honda no longer manufactures that part but they could get a used one for $200 (I'm in Canada). Car is still there.
After three days of trying to find out why my car cranks but do not start I started troubleshooting the basics, in this case ignition and fuel pressure. Since I am not a mechanic, I check the fuel pressure and got nothing so I change the fuel pump with a new one. That didn't fix it. Came to you-tube and found your video and decided to check the main relay, found that one connection was bad I solder it as per the video. The car is back up and running....Thank you so much for the video.
Hey Eric you helped me a lot in the past, check this out! I start my car and it cuts right off, however if i use the automatic starter it stays on... until i hit the break or put the hand break down... (94 accord ex coupe)
@MarkMortem09 Honda's are famous for ignition switch problems and you describe the classic symptoms. You don't need to replace the entire switch just the electrical portion fastened to the back of the lock assembly.
erice i have question about the relay ?where is the main relay on87 honda accord lxi i see there are sume relays in the fuse box but none wold say for fuel pump
@zolo2029 The 87's didn't have issues with main relays like the later models did, to be honest I don't remember where that's located anyway. Be sure the issue is with fuel pressure and not something else.
I have a del sol 95 an put a b18b with the motor harness an ecu it turns but no fuel or spark check the relay an switch it but same thing don't know y
@wrx531daniel531 If you don't have spark it has nothing to do with the relay. Given that you have done a significant modification you might want to go back and check all the work you did to make sure everything is connected correctly. Good luck.
My Legend's relay finally failed., so I opted to repair it - works like new. I'm not sure if it's been mentioned, but the old solder should be removed with solder wick or a solder sucking device. Adding new solder to the old is not advisable. Also, to properly create a new, clean, non-"ball" solder joint, the tip of the iron (preferably a chisel tip) should be touching the circuit board pad and the lead/pin of the component. Solder should rarely be applied directly to the iron.
@EricTheCarGuy np. I've learned a lot from your videos, so I'm glad I could contribute something. One thing to add regarding the relay soldering: I decided to do all the solder joints, not just the cracked ones (I had a few cracks forming), to prevent future issues. To remove the solder, the iron should be nice and hot then it should dialed down when applying new solder (adjustable temp iron is best).
@hoopfan71 It would have helped if I wasn't using my 'broke ass' soldiering iron, it really needs a new tip, when it's new it gets nice and hot. Thanks for your comments.
@surfsinge Good luck but just make sure your car isn't starting because of a fuel pressure issue, if you don't have ignition soldering the relay won't help.
@EricTheCarGuy hey eric i have a 1996 cadillac deville it cranks but dont start im wondering if its because the service ignetion system light is on or what, do you think thats the problem?
I had an old Honda, 70's vintage, that would suddenly die in the rain, then next day it always started. Dash lights stayed on, and it would sputter a little and die in a few seconds, sometimes a little better with gas pumping. The prior owner had replaced the coil and wires, with no luck. It happened only once a year or so, and I honestly lived with it until I sold it years later. Of course with an intermittent problem, diagnosis was a problem. Sounds like this was the diagnosis -- do you agree?
@spelunkerd No as the old 70's Honda's used mechanical fuel pumps without main relays and the only thing the computer did was activate the air control valves for the carburetor. it sounds like something was getting wet that shouldn't have though.
Hi Eric ! So I tried this main relay thing this weekend with the soldering. Was working fine yesterday, and this morning it rained and car is back to same problems even after soldering the main relay. Symtoms are: Turn key, power lights are on, engine light comes on, then few seconds it goes away, I can hear the fuel injection noise, then when I turn the key to start cranking, power completely dies! and after a few tries of this, the power will not even come back on. Battery is new. any ideas?
@EricTheCarGuy i have no power wire going to my fuel pump when the relay is hooked up but if i jump the wires like the book says i have a power wire the relay is a new one i just got from the store this morning
@kandiceconley As I suggested in the last comment I don't feel your problem has anything to do with the main relay if your engine won't even crank, I suggest you watch the video that I suggested about diagnosing a starter problem and go from there.
@EricTheCarGuy Hey Eric... determined that my no start is probably the relay. We pulled it today and I can't see with the naked eye a crack in the joints, but I am going to solder them anyway. What gauge solder do you use, and what type? Resin coated, 60%-40% and do you de-solder the joints ever, before starting a new bead? We know this is a fuel problem, as we squirted butterfly with some starting fluid and it ran for a moment., and replaced a bad low battery. Any thoughts?
@rollingbunny I did do a video on how to check the fuel pressure quickly, I recommend you watch that first and verify that a lack of fuel pressure is what is causing the no start. I just used regular solder, in fact you could probably just remelt the stuff that is already there.
I just want to say that I am currently trying this method out for my car. Although I can't really find any solder joints that are cracked or anything like that. Im just going to solder the rougher looking joints and pray that it works. Anyways, thanks for the video! Its really helped. I think.
@Smokebomb91 Don't bother if you have fuel pressure, you should check to see if you don't have fuel pressure first and if you don't then try this, if you have fuel pressure you can look elsewhere for the no start. I've done a video on checking for fuel pressure if that helps.
@EricTheCarGuy Luckily I got it fixed that day with the relay switch. Thanks for replying though. I'll probably be checking your page for solutions to my problems from now on. haha. You seem to be pretty knowledgeable about civics and I don't know much of anything. haha
Thanks for the quik responce Eric. I did check the timing and it looks to be on the money. There are no codes on the ecu or anything. The car was running great and I go to start it and it ran great for 5 mins the just died. I tryed giving it gas while it was dieing and nothing, My pugs are wet of gas so I no its getting in there, checked the pressure and is good. spark is there. Compression checked to night. Would the car die if lost compression? or could a fuel injector be the problem? thanks
@EricTheCarGuy Spelling on a comment it is not necessary. The method is to heat the point you are going to solder then apply the solder at the other end thus giving you a better solder connection. No need to get angry. Youtube has a lot of tips. I am simply pointing out you are doing it wrong if you did it correctly the device with you are repairing will last longer and no unnecessary heat will be coursed by this method thus less harmful to the board.
Hey Eric, I have a quik question, my civic is doing the same thing not starting. It has spark and it has plenty of fuel pressure. Would the main relay still cause it not to start if I still have them both? Does the relay controll something else that would make it not start? Im about to pull it out now anyway to check it out. Thanks in advance for the help.
@djblisir No, if you have fuel pressure the main relay is not the problem. Since you have spark and fuel the next thing to check is to see if the engine is in time or if there is some other mechanical issue.
hi eric need help..lol i have a 1991 honda accord..good distributer...good coil,,good wires..good cap and rotor,,seems to have intermintend spark,,mostly no spark we are stumped..thxs powwer to coill checked a few times..good igniter in distribiter too spark not comin directly out of coil most times?? have tried 3 coils all same
@jasondog37wolf It might be the parts you are using or a connection issue somewhere, you need to find out what you are missing during the no spark condition. See the video I did on diagnosing a no spark condition for that test.
@EricTheCarGuy thxs...ill explain a bit more,,this is a derby car lol im runnin a gas tank with a fuel pump directly hooked up to a switch..on or off..not controlled by the key,,i thought i might have a bad main relay a few weeks ago cause no fuel pump was workin off key..does main relay have to do wit spark too?? thxs,,also i forgot to mention we put the distribter from the derby car 1991 accord into my 1992 accord daily driver lol and she fired up?? we are stumped...
ihave a question ihave a 1991 accord EX wagon auto, like 2 days ago im at a red light and the car started bogging down n it died. . it didn't want to start after a few tries with the key then went to the gas station around the corner to see what was going on and it died again. it will have problems starting up. (i will have to turn the key almost twice.) alot is saying that there is no spark. . bad distributor and ICM. i hope they are right. i hope to here an answer soon
@585Lowrider I hope they aren't as replacing an OE distributor with an aftermarket one is a mistake in my opinion, also Honda ECU's hardly ever go bad on their own, it's usually some outside damage that causes them to fail if they do at all. You might want to take is somewhere else as to me it doesn't sound like they are familiar with working on Honda's.
@EricTheCarGuy I have confirmed that there is spark. .Although, No fuel pressure at the fuel line coming off the filter. . . Fuel pump is done. maybe a clogged filter..but im going to buy a whole new fuel pump. .I also did some research about fuel pump symptoms. . One of them was it can cause an engine to stall.. It may turn on and run but not for long unless u put it in nuetral at a red light keep the RPM high n not let it stall. . And this is what exactly happen to me. hope this works
Guys if you go this route pleas de-solder the board first. You can get a solder pump from any electronic store for really cheap. Just heat up the old solder on the board and remove it. Then replace it with new solder.That way you get a clean solder joint. Also if yo utake out the whole piece, drill a few small holes on the sides and on the front of the housing so heat can escape. Make the holes about the same size as the numbers on the front of the housing.
@Mataleaoexpert I'm not saying that wouldn't be a more thorough job but in my experience it's really not necessary as I've repaired hundreds of these this way and none have come back.
Great idea pulling the guts out of the relay vs. trying to remove the entire relay. I swapped the new guts into the old body. It made a 2-hours job into a 10 minute one.
i have a 1986 honda accord Lxi. it starts up in the morning no problem but when i get about 5 min down the street it will shut off at every stop sign or light. So i end up cranking the car back up noticing the rpm is going from 1 to 3 for no reason. my car usually only stopped when my Ac was on, so i dont drive with it on any more but now its still shutting off. Before this happened i unplugged the wires to my main fan because it would kill my battery when i would go to the store
@MrGLENWOOD2 It sounds like you may have more than one issue. Start with any check engine lights you might have, if you don't have any look to the general things like tune up items and vacuum leaks. Good luck.
@EricTheCarGuy thanks, i just looked up the vacuum leak issue. i just noticed that the cap to my distributor is falling off. so thats what has been causing some of the issue right there.
Thanks Eric, I re-soldered the relay under the dash on my daughters 93 accord that had a d4 flashing light. The car would not start when the D4 ight was flashes. I removed the relay from under the dash on the drivers side and un-soldered using a solder sucker and re-soldered all the connections. It's been over a month ago since I made the repair and haven't had the problem since the repair. Great listing. Thanks for sharing. Big help.
@mnbhable I'm a little confused as the D4 is for the transmission and has nothing to do with this relay. The only thing I can think of is a problem with the PRNDL switch not registering that it was in park causing it not to start, the main relay would have nothing to do with that.
ok so i have a 95 civic with a 98 integra gsr swap one day i was out in my car started it up and in like a min it turned off by itself tried again and same thing took it to the shop and timing is good fuel pressure is good and also getting spark now just cant figure out why it wont start it cranks but thats about it noticed that the intake manifold has like a dark black residue built up in it almost like tar can you please help me out?
@airgul24 If you have any check engine lights start with that but to be honest when you modify something like that it could be any number of things. If you have spark and fuel as you crank I might look to see if you have a large vacuum leak or something. I would also check to see if the plugs were wet with fuel which would indicate a flooded condition.
I know this to be a fix. I have used it many times on friends Hondas.
The only criticism (and no disrespect intended) I have is that Eric the Car Guys soldering is really bad. His repair is what makes this happen in the first place. Before anyone tries this, they should watch some soldering videos.
@hs100 Everybody says that about my soldering in this video but honestly I've not had a problem with them coming back. Thanks for your input and for your comment.
@Eric TheCarGuy I have a 99 honda accord that starts up fine in 100+ weather but after 20 twenty mintues of driving it turns off. I could be at a light or driving 40mph the car will just turn off. I have to wait a couple of mintues before the car will turn on again then it will die and I have to wait again. At night it works fine and not once has it turned off. Can the MFR be the cause of this issue? Thanks.
@HJCartman You need to find out what is missing during the no start to make that determination, if you don't have fuel during the no start then I would recommend starting with the main relay but if you don't have spark you need to explore that instead, watch the No Spark diagnosis for more info on that.
I just recently bought a 1993 honda accord lx .Superb vehicle , one problem after it rains it doesnt start :( . But then when its sunny it will run like a beast. Do you think the main relay would have anything to do with it ?
@FlamingUppercut Nope, I would be checking the ignition for voltage leaks, see the video that I did on voltage leaks to help you find them if you have them.
I have a 1991 honda prelude 2.0 si. Recently my car won't start when it's been heated up but will start just fine if it's been sitting for a few hours. The other day while i was driving it i randomly lost all power. Do you think that it might be the main relay?
@spdwyer06 If you don't have fuel pressure that is the first place I would start but with a no start condition the first step is to find out what is missing, spark, fuel, or an engine mechanical issue.
@1daniray I'm very happy to have saved you from buying a fuel pump, Honda fuel pumps hardly ever go bad and the aftermarket replacements aren't nearly as good. Thanks for the comment.
@EricTheCarGuy, Wow man you are f@$&ing awesome I just re-soldered and hooked it up and like magic now I have feul pressure too bad that now my battery is too weak
@EricTheCarGuy , Just took her out and after three weeks of no driving she wanted to just go. I repaired a total of four solder points. Didn't take to long either Thanks again.
Eric, Can you please explain what is the role of the main relay? Is it the same as the fuel relay or is it something else? And how does it cause the car not to start?
@opsvideo2008 Other cars may use a different set up. Relays are used to control high amp circuits with low current switches, the fuel pump is a high amp circuit so it uses a relay to protect the low voltage side. It's function is to turn on the fuel pump but in addition it also powers other circuits during ignition run, hence the reason it's called a "Main Relay" and not "Fuel Pump Relay".
Three weeks ago my 94 accord ex stopped turning on so I changed the starter, then the ignition switch then it wont start unless I jump the starter.WTF. Now its acting like the fuel pump is out but when I was getting towed I dumped it in sec and she started, let it run for 15. The next day nothing. Can you help EricTheCarGuy Thanks
@turbomx66 Stop replacing parts, that's not diagnosing anything just making your wallet lighter. I've done videos on starter diagnosis that I suggest you watch. You didn't specify if it was a crank no start or a no start no crank, if it's a crank no start you need to find out what is missing when it's not starting, spark, fuel, or both. Once you do that you can begin to find the problem. Good luck.
@EricTheCarGuy--It has no fuel coming in, so that is why I thought at first it was the fuel pump. But after watching your video I removed my main relay and it looks like that is my problem it looks like the second one you showed. And it was doing the crank and no start. Thank you and I will keep you posted, I still have to go to get the soldering equipment.
@turbomx66 Honda fuel pumps hardly ever go bad, if you fix the relay and you still don't have fuel pressure just make sure you check for power and ground at the fuel pump connector before you replace it. Most fuel pressure problems are solved by repairing the main relay however.
@Dillonj177 Unless it has an aftermarket fuel pump already in it it's probably not the fuel pump if it's not starting because of a lack of fuel pressure. Honda fuel pumps hardly ever go bad.
I had just bought a 93 del sol from my friend about two weeks ago and after about 20 min running i shut off the car and wouldnt start again. long story short, i watched this video, resoldered the joints and voila!!! started right up... no problems since. Thanks again!!!!
hey my girlfriend has a 92 accord that i believe is having fuel issues. the fuel pump was replaced a few months ago and now the car works then wont work. When i took out the main relay i noticed no sign of cracked sotter, is there something else that could be wrong with the main relay other than cracked sotter??
@GanjaGuy36 In 15 years of working on Hondas I've replaced 2 fuel pumps and both of those were aftermarket. If you don't check for power and ground at the fuel pump connector before you replace the pump your probably doing the wrong thing. You may not see signs of a main relay problem but if you have a fuel pressure issue on a Honda the main relay is always the first place to start as I've replaced more of those than I can count.
Thanks for the tip, we just went ahead and bought one for my son's 95 Accord. It was only about 50.00 and fixed the problem right away. It took about 10 min to replace. Thanks again!
So... just FYI, the Main Relay from my 01 Accord 4CLY2DR looked pretty different. The replacement that I purchased wouldn't fit into the housing of the original. Ended up simply taping it under the dash for security. The stock board had a small area where it appeared that some weathering may have occurred... but nothing that seemed an easy fix with a bit of solder. I still have the old component if anyone wants me to post some pics. Will park the car in the heat tomorrow to test new one.
yep , i had same problem, it was just what you said it was thanks , he put a new one in and im good to go, although i have yet to put it to the test , i ll report back if it doesnt start.
@ggonz003 Yea, first check to see if you don't have fuel pressure before you condemn a main relay, if you have fuel pressure the main relay is not the problem and you need to look elsewhere for the cause of the no start.
My 93 accord wont start, the other day it would just keep turning over but wouldnt start. then later on it did which led me to believe it was the main relay, but yesterday after driving and going to class then i came out and it wouldnt start. it wouldnt turn over or nothing. it was just a click sound as i turned the key, just one click sound.
@llincoln2479 I recommend you watch the video that I did Starter Diagnosis 101. Also in the future don't condemn a main relay unless you don't have fuel pressure, if you have fuel pressure the main relay is not the problem.
i found the problem when i was moving some wires around looking for the relay switch before you responded to my post. well i moved the wires to a brown plug above my fuse box the fan came on and i held it there and it cranked the plug had melted and lost contact i believe. but do you have any idea what this plug may got to and where i can get another. above the fuse box on the right its brown
@TheHondaguy18 Probably the only place you will find one is in a new wiring harness, sometimes they sell connectors separately but not often, you may want to check in a salvage yard and cut one off and splice it in. Good luck.
Thanks again, Eric! I had a crank, no start problem that ended up being just this. The hardest part of the job was just finding the bugger hiding under the cruise control box. This makes 4 I owe ya. =)
Hey, Eric, I have a 94 Civic that I have been 'putting up with' for about a year. It starts all the time when it is hot out but when there is humidity or it has rained recently, it takes up to 5 min for the main relay to open and I can start the car. I'm getting ready to get out the Haines and try to replace it. Think that it is the main relay? Thanks!
@samcuao Unless you don't have fuel pressure the main relay has nothing to do with it. Given that the problem occurs during high humidity I would look to the ignition system. Be sure you diagnose what you are missing when the car is not starting before you commit to buying any parts.
i have a 94 honda accord ex 5 spd and i was driving down the interstate and the car just shut off. pulled to the side tried to crank it and it wouldnt ever start wouldnt even click. it doesnt have fuel pressure. my head lights will come on though. any suggestions hope you can reply asap. oh yeah when i bought it in order to turn my radio on i have to turn the lights on if that has any thing to do with it. thx
@TheHondaguy18 Sounds like you may have an electrical issue(s) which makes it impossible for me to say really. You might check the ignition switch since it's not cranking at all, it is common for Honda ignition switches to cause a problem similar to yours. You don't need to replace the entire switch but rather just the electrical portion.
Thanks, Eric! You saved me a bundle. It sure was the MainRelay on my '90CRX. Starts every time now. But, the car is throwing oil up onto the underside of the hood (only while driving) near the driver's headlight. Seems like a lot of oil, but can go weeks without adding. Any thoughts?
ok my civic is got a new battery showing 12.86 volts im getting power to the front fuse box and to the starter. well it wont start now. i got really dim lights and when i turn the key to on(ll) there is no dash lights that come on or anything
@Kayla557 I don't believe your problem has anything to do with the main relay. You might want to check the operation of the ignition switch, you might also watch the video I did, Starter Diagnosis 101.
@EricTheCarGuy ok i watched that video. today i tried to start my car and i have no head lights or dash lights. i do have have the normal lights that come on when i turn the key to the on(ll). when i go to turn my key my mail relay was clicking well i tried to sodder the joints and now when you turn the key on it makes a nosie all the time dont go off till you turn the key off. and when i go to start the car is does nothing i think the lights that come on go out when i turn the key to start it
@Kayla557 It doesn't sound like the main relay has anything to do with your problem. I would be looking for an issue with the ignition switch as I mentioned in my last comment. I would also check the battery and it's connections.
So my 2000 Accord was having problems starting after sitting in the Vegas heat. My husband researched and figured out it was the relay, but we were planning to just buy a new one. Well after finding this video he tried soldering it and it worked! He did it last weekend and my car has started up right away every time with no issues ever since. Thank you for the tip!
hey thanx for this video..hope u can check out my video and give me your opinion im thinking its my main relay ..ill have to check that out when i get paid tomorrow
@icemangixxer The main relay is located under the dash on the drivers side normally, just make sure you don't have fuel pressure when your trying to start it, if you have fuel pressure the main relay is not the problem.
@EricTheCarGuy If the main relay is the issue, is there only supposed to NOT be fuel pressure when the car won't start? So later when all has cooled down and the car starts, obviously there is going to be fuel pressure, right?
@zloungeact Your question confuses me sorry but if you have a no start on a Honda and you know you don't have fuel pressure the first place to look would be the main relay.
@jcb1972 Part of it is, it also powers up the computer circuit if I'm not mistaken. It's called a main relay because it controls more than just the fuel pump.
Eric, You are one of the best there is. Awesome vid. I have a question. My 2000 Honda city, 1.5exi has been misfiring very much when it gets heated up. Only 3 injectors are firing. Spark plugs, plug wires, fuel filter, fuel tank replaced, no luck. Ecu says no trouble codes. Could it be the main relay. Yes the car starts without any issues, but there is heavy misfire. Help would be greatly appreciated. :)
hustlestar46 1 week ago
Thanks for this video, just did it about 2 hours ago, i tested the pump jumping terminals 5-7 and it was working, got the relay checked and fixed like the video and that's it! Its been like 2 years with this hot day's starting problem, hope this lasts forever.
Anyway, thanks ETCG more videos on ACCORD 90-93 would be great!
Dantelchico 1 week ago
holy $#!% it worked!! my car is finally up and running normally again!!! thanks eric!
ingasumadre510 2 weeks ago
Nice tip, but just a tip about soldering - you shouldn't be holding the tip on the part while it warms up (you'll damage the part) and you shouldn't be creating a bead and making it blend down - that's a good way of creating another bad joint that will fail again. Let the iron warm up to full temp, apply it to the pin until it melts the existing solder, then feed more solder into the melt pool (not onto the iron tip). HTH
CoyoteBoyUK 3 weeks ago
ERIC help me asap K i have not checkd tha main relay yet but man will it pop the fuel fuse under the hood to ? every time you turn the key on?
SkiTle 3 weeks ago
Hey Eric, just pulled it out (main relay), and noticed that brownish residue. It is especially around one of the soldered points. What is this residue, and does it affect the relay operation? Thanks
CurlyPinion 4 weeks ago
Good one.
binnsh 1 month ago
TRON bikes race on that thing
boolshmool 1 month ago
"A common problem with Honda's is the main relay"
I've googled, read plenty of threads, and after watching your video. I'm convinced this is the problem with my '90 EX Accord, Coupe. Automatic.
Thanks for your video. Guys like you are why internet is so handy and amazing. thank youuuuuuuuuu :)
BurningFliesAlive 1 month ago
Eric, I LOVE YOU!!!! After seeing this video my husband took the relay off my 91 accord and replaced it and it cranked right up! My car has been sitting in the yard for i know six months. Thank you so, so much!
lrsmif 1 month ago
This has been flagged as spam show
I have a 98 civic dx and its been sitting there for 2 months now, it cranks but doesn't start it never had anything wrong with it, i parked one day in the parking lot then when i came back it wouldn't start!... we changed this, the whole distributor, the rotor, and still nothing... this mechanic came to my house and put this little machine in the fuse things and it gave no codes! he said the starter engine is fine, but the distributor isn't recieving electricity I WANT TO DIIIIEEEEEE!!!! :( :(
ivalid1my1ass 1 month ago
I have a 98 civic dx and its been sitting there for 2 months now, it cranks but doesn't start it never had anything wrong with it, i parked one day in the parking lot then when i came back it wouldn't start!... we changed this, the whole distributor, the rotor, and still nothing... this mechanic came to my house and put this little machine in the fuse things and it gave no codes! he said the starter engine is fine, but the distributor isn't recieving electricity I WANT TO DIIIIEEEEEE!!!! :( :(
ivalid1my1ass 1 month ago
@ivalid1my1ass had the same problem try changing the main relay and the ignition switch.i have a feeling is the ignition switch.
lok0605 2 weeks ago
Thanks Eric this did the trick on my Honda CRX race car. A little bit more info these are called dual relays on old Bosh FI systems, it is the interface between the car and the FI system one relay puts pwr to the fuel pump the other to the ECU (hence Dual relay/main relay) my car had no ecu codes, no spark.
davegt27 2 months ago
@davegt27 Thanks for your input and for your comment.
EricTheCarGuy 2 months ago
Dude man your a life saver, My car hasn't started for a month and after I saw this video and checked my main relay and wiggled it a bit it started right up. I had cracks in the Main Relay that prevented spark to my car. Keep up the good work man and thanks again for this video.
KuBurd1 2 months ago 2
@KuBurd1 You're most welcome, thanks for the comment.
EricTheCarGuy 2 months ago
yup... just replaced the relay on my 90 accord...it was a BITCH...
TheWyatt007 2 months ago
@TheWyatt007 Next time just pull the 'guts' out instead of trying to unbolt it.
EricTheCarGuy 2 months ago
@EricTheCarGuy Eric please please help.. I have this problem, with my h22 accord. I just did this swap myself. Okay when I put my car in 1st gear it cuts out the all the lights flash and the engine runs like crap and eventually stalls when I let the clutch out more. But when i put it in reverse it has all the power there and no problem. What could this be? Can any one help?!? I checked all grounds they are all tight. I have no clue what the problem is.
kingofbass63 6 days ago
I had my accord with a local mechanic for no start for 3 days and they changed "Ignitor" and "Reprogrammed" the key but they could not make it start. Bill was pilling over 300 already and still no start. So, I checked this video and went to the mechanic and told him to check main fuel relay...which I force them to do, then you know what...exactly!!!! - bad main fuel relay it is. Now I have doubt that they charge me for things that I really didn't need. Thanks Eric, you are such a help.
archetype001 2 months ago
@archetype001 Yea, this is pretty basic and should be common knowledge, not to mention it doesn't sound like they checked for spark or fuel properly, I'd look for another shop.
EricTheCarGuy 2 months ago
@EricTheCarGuy Yes, they lied me about checking main fuel relay on phone. So, I'm pretty pissed about that. Definitely I will be looking for other shop next time. Thanks Eric.
archetype001 2 months ago
You ought to edit the video and add a mention of a flux pen in it. I do tons of hobby electronic repairs and I found that with bad solder joints, get a flux pen and apply a generous amount to the old solder, then simply heat it up and it will rejoin the connection as if you went and removed the old solder and applied new solder. (for those that don't know, flux helps make the solder liquid which is why solder is hollow inside, containing flux)
TheInitialForce 3 months ago
@TheInitialForce
Sorry I meant to say that is why solder WIRE is hollow inside, containing flux
TheInitialForce 3 months ago
@TheInitialForce I won't reedit the video but it sounds like that would make for a great NEW video. Thanks for your suggestion.
EricTheCarGuy 2 months ago
@EricTheCarGuy the main relay on my 89 civic clicks but fuel pump doesnt prime, could it be bad relay or bad fuel pump
MrLagunero15 3 months ago
@MrLagunero15 The only way to know is to check for power and ground at the fuel pump connector itself as you crank the engine, if you have power and ground and the pump doesn't run the pump is bad. FYI OE Honda pumps hardly ever go bad in my experience.
EricTheCarGuy 2 months ago
Thanks for video it explains my current situation. Unfortunately my '92 Civic is in the shop as I write this. Had a problem for 7-8 weeks intermittently (start/stall, stall when driving but restart okay). Spent too much money at one garage where they couldn't pinpoint a problem and it continued. Finally went to dealership and they are fixing it but costly. As a female without mechanical background I appreciate your thorough explanation with examples.
oscarswallow 3 months ago
@oscarswallow It may not be this relay however as it could also be the electrical portion of the ignition switch that could also cause that symptom. This only works if the car does not have fuel pressure. Thanks for the comment and good luck.
EricTheCarGuy 3 months ago
@EricTheCarGuy I think you are right. Honda said they fixed the problem but less than a week later the problem returned. Brought it back to dealership and now they say the diagnostics for older models aren't as accurate as newer models but it could be ignitor problem, distributor (had that replaced at that dealership in Sept. 2010 so no longer under warranty), or an ECU issue but Honda no longer manufactures that part but they could get a used one for $200 (I'm in Canada). Car is still there.
oscarswallow 3 months ago
Hi Eric,
After three days of trying to find out why my car cranks but do not start I started troubleshooting the basics, in this case ignition and fuel pressure. Since I am not a mechanic, I check the fuel pressure and got nothing so I change the fuel pump with a new one. That didn't fix it. Came to you-tube and found your video and decided to check the main relay, found that one connection was bad I solder it as per the video. The car is back up and running....Thank you so much for the video.
grullonbb 3 months ago
@grullonbb You're most welcome. Thanks for the comment.
EricTheCarGuy 3 months ago
need a soldering wick & flux to remove the old solder then alittle flux and add some new solder.
you know that way was horrible.
SuperDeluxe80 3 months ago
@SuperDeluxe80 I realize I should have done a better job of soldering however I haven't had one come back yet. Thanks for your input.
EricTheCarGuy 3 months ago
Hey Eric you helped me a lot in the past, check this out! I start my car and it cuts right off, however if i use the automatic starter it stays on... until i hit the break or put the hand break down... (94 accord ex coupe)
MarkMortem09 3 months ago
@MarkMortem09 Honda's are famous for ignition switch problems and you describe the classic symptoms. You don't need to replace the entire switch just the electrical portion fastened to the back of the lock assembly.
EricTheCarGuy 3 months ago
erice i have question about the relay ?where is the main relay on87 honda accord lxi i see there are sume relays in the fuse box but none wold say for fuel pump
can any body help me u can call 319 430 1900
zolo2029 3 months ago
@zolo2029 The 87's didn't have issues with main relays like the later models did, to be honest I don't remember where that's located anyway. Be sure the issue is with fuel pressure and not something else.
EricTheCarGuy 3 months ago
i have a honda accord 91 i have been looking for that main ralay i found one that says main but its gray is that the same one?
efrain17221 3 months ago
@efrain17221 It's under the dash on the drivers side and is often grey or black.
EricTheCarGuy 3 months ago
I have a del sol 95 an put a b18b with the motor harness an ecu it turns but no fuel or spark check the relay an switch it but same thing don't know y
wrx531daniel531 3 months ago
@wrx531daniel531 If you don't have spark it has nothing to do with the relay. Given that you have done a significant modification you might want to go back and check all the work you did to make sure everything is connected correctly. Good luck.
EricTheCarGuy 3 months ago
My Legend's relay finally failed., so I opted to repair it - works like new. I'm not sure if it's been mentioned, but the old solder should be removed with solder wick or a solder sucking device. Adding new solder to the old is not advisable. Also, to properly create a new, clean, non-"ball" solder joint, the tip of the iron (preferably a chisel tip) should be touching the circuit board pad and the lead/pin of the component. Solder should rarely be applied directly to the iron.
hoopfan71 4 months ago
@hoopfan71 Thanks very much for that tip and for your comment.
EricTheCarGuy 4 months ago
@EricTheCarGuy np. I've learned a lot from your videos, so I'm glad I could contribute something. One thing to add regarding the relay soldering: I decided to do all the solder joints, not just the cracked ones (I had a few cracks forming), to prevent future issues. To remove the solder, the iron should be nice and hot then it should dialed down when applying new solder (adjustable temp iron is best).
hoopfan71 4 months ago
@hoopfan71 It would have helped if I wasn't using my 'broke ass' soldiering iron, it really needs a new tip, when it's new it gets nice and hot. Thanks for your comments.
EricTheCarGuy 3 months ago
thank eric
i am pete salvatori form san diego
i hope i have the courage to go out there and get under the dash
borrow a sordering iron and flux
GOD bless you
surfsinge 4 months ago
@surfsinge I think you'll do fine, good luck.
EricTheCarGuy 4 months ago
i hope ou kno a used relay cost 20 bucks new 40 buck
VTECkid53 4 months ago
dear eric ia m pete from san diego
i'll try this relay solder plan
GOD bless you thank you
wish me luck
stay dirty have fun
surfsinge 4 months ago
@surfsinge Good luck but just make sure your car isn't starting because of a fuel pressure issue, if you don't have ignition soldering the relay won't help.
EricTheCarGuy 4 months ago
@EricTheCarGuy hey eric i have a 1996 cadillac deville it cranks but dont start im wondering if its because the service ignetion system light is on or what, do you think thats the problem?
thebabydeno 4 months ago
I had an old Honda, 70's vintage, that would suddenly die in the rain, then next day it always started. Dash lights stayed on, and it would sputter a little and die in a few seconds, sometimes a little better with gas pumping. The prior owner had replaced the coil and wires, with no luck. It happened only once a year or so, and I honestly lived with it until I sold it years later. Of course with an intermittent problem, diagnosis was a problem. Sounds like this was the diagnosis -- do you agree?
spelunkerd 4 months ago
@spelunkerd No as the old 70's Honda's used mechanical fuel pumps without main relays and the only thing the computer did was activate the air control valves for the carburetor. it sounds like something was getting wet that shouldn't have though.
EricTheCarGuy 4 months ago
Hi Eric ! So I tried this main relay thing this weekend with the soldering. Was working fine yesterday, and this morning it rained and car is back to same problems even after soldering the main relay. Symtoms are: Turn key, power lights are on, engine light comes on, then few seconds it goes away, I can hear the fuel injection noise, then when I turn the key to start cranking, power completely dies! and after a few tries of this, the power will not even come back on. Battery is new. any ideas?
6tea9 5 months ago
@6tea9 Doesn't sound like it has anything to do with a main relay. I think you might benefit form the Starter Diagnosis 101 video.
EricTheCarGuy 5 months ago
@EricTheCarGuy i have no power wire going to my fuel pump when the relay is hooked up but if i jump the wires like the book says i have a power wire the relay is a new one i just got from the store this morning
kandiceconley 5 months ago
@kandiceconley As I suggested in the last comment I don't feel your problem has anything to do with the main relay if your engine won't even crank, I suggest you watch the video that I suggested about diagnosing a starter problem and go from there.
EricTheCarGuy 5 months ago
Pantera, I'm Broken??? Hell yeah...
brandon804va 5 months ago
what grade solder
jayguy173 5 months ago
I was having a rouugh two weeks without a car. me being broke, and your help made my car work. so thank you. much appreciated
KidInWhiteKlouds 5 months ago
@KidInWhiteKlouds I'm happy to help, thanks for your comment.
EricTheCarGuy 5 months ago
@EricTheCarGuy No problem.
KidInWhiteKlouds 5 months ago
@EricTheCarGuy Hey Eric... determined that my no start is probably the relay. We pulled it today and I can't see with the naked eye a crack in the joints, but I am going to solder them anyway. What gauge solder do you use, and what type? Resin coated, 60%-40% and do you de-solder the joints ever, before starting a new bead? We know this is a fuel problem, as we squirted butterfly with some starting fluid and it ran for a moment., and replaced a bad low battery. Any thoughts?
rollingbunny 5 months ago
@rollingbunny I did do a video on how to check the fuel pressure quickly, I recommend you watch that first and verify that a lack of fuel pressure is what is causing the no start. I just used regular solder, in fact you could probably just remelt the stuff that is already there.
EricTheCarGuy 5 months ago
I just want to say that I am currently trying this method out for my car. Although I can't really find any solder joints that are cracked or anything like that. Im just going to solder the rougher looking joints and pray that it works. Anyways, thanks for the video! Its really helped. I think.
Smokebomb91 5 months ago
@Smokebomb91 Don't bother if you have fuel pressure, you should check to see if you don't have fuel pressure first and if you don't then try this, if you have fuel pressure you can look elsewhere for the no start. I've done a video on checking for fuel pressure if that helps.
EricTheCarGuy 5 months ago
@EricTheCarGuy Luckily I got it fixed that day with the relay switch. Thanks for replying though. I'll probably be checking your page for solutions to my problems from now on. haha. You seem to be pretty knowledgeable about civics and I don't know much of anything. haha
Smokebomb91 5 months ago
Thanks for the quik responce Eric. I did check the timing and it looks to be on the money. There are no codes on the ecu or anything. The car was running great and I go to start it and it ran great for 5 mins the just died. I tryed giving it gas while it was dieing and nothing, My pugs are wet of gas so I no its getting in there, checked the pressure and is good. spark is there. Compression checked to night. Would the car die if lost compression? or could a fuel injector be the problem? thanks
djblisir 5 months ago
@djblisir It sounds like it flooded, you may have lost spark momentarily so you might want to check out the ignition system.
EricTheCarGuy 5 months ago
why or how is it even cracked? manufacturing defect?
asiangunner901 5 months ago
@asiangunner901 That's pretty much it, some refer to this as a 'cold solder joint failure'.
EricTheCarGuy 5 months ago
Who bought you how to solder. You fail.
GMELECTRONICS365 5 months ago
@GMELECTRONICS365 Nobody bought me how to solder. You spell worse than me.
EricTheCarGuy 5 months ago
@EricTheCarGuy Spelling on a comment it is not necessary. The method is to heat the point you are going to solder then apply the solder at the other end thus giving you a better solder connection. No need to get angry. Youtube has a lot of tips. I am simply pointing out you are doing it wrong if you did it correctly the device with you are repairing will last longer and no unnecessary heat will be coursed by this method thus less harmful to the board.
GMELECTRONICS365 5 months ago
Hey Eric, I have a quik question, my civic is doing the same thing not starting. It has spark and it has plenty of fuel pressure. Would the main relay still cause it not to start if I still have them both? Does the relay controll something else that would make it not start? Im about to pull it out now anyway to check it out. Thanks in advance for the help.
djblisir 5 months ago
@djblisir No, if you have fuel pressure the main relay is not the problem. Since you have spark and fuel the next thing to check is to see if the engine is in time or if there is some other mechanical issue.
EricTheCarGuy 5 months ago
hi eric need help..lol i have a 1991 honda accord..good distributer...good coil,,good wires..good cap and rotor,,seems to have intermintend spark,,mostly no spark we are stumped..thxs powwer to coill checked a few times..good igniter in distribiter too spark not comin directly out of coil most times?? have tried 3 coils all same
jasondog37wolf 5 months ago
@jasondog37wolf It might be the parts you are using or a connection issue somewhere, you need to find out what you are missing during the no spark condition. See the video I did on diagnosing a no spark condition for that test.
EricTheCarGuy 5 months ago
Comment removed
jasondog37wolf 5 months ago
@EricTheCarGuy thxs...ill explain a bit more,,this is a derby car lol im runnin a gas tank with a fuel pump directly hooked up to a switch..on or off..not controlled by the key,,i thought i might have a bad main relay a few weeks ago cause no fuel pump was workin off key..does main relay have to do wit spark too?? thxs,,also i forgot to mention we put the distribter from the derby car 1991 accord into my 1992 accord daily driver lol and she fired up?? we are stumped...
jasondog37wolf 5 months ago
ihave a question ihave a 1991 accord EX wagon auto, like 2 days ago im at a red light and the car started bogging down n it died. . it didn't want to start after a few tries with the key then went to the gas station around the corner to see what was going on and it died again. it will have problems starting up. (i will have to turn the key almost twice.) alot is saying that there is no spark. . bad distributor and ICM. i hope they are right. i hope to here an answer soon
585Lowrider 5 months ago
@585Lowrider I hope they aren't as replacing an OE distributor with an aftermarket one is a mistake in my opinion, also Honda ECU's hardly ever go bad on their own, it's usually some outside damage that causes them to fail if they do at all. You might want to take is somewhere else as to me it doesn't sound like they are familiar with working on Honda's.
EricTheCarGuy 5 months ago
@EricTheCarGuy I have confirmed that there is spark. .Although, No fuel pressure at the fuel line coming off the filter. . . Fuel pump is done. maybe a clogged filter..but im going to buy a whole new fuel pump. .I also did some research about fuel pump symptoms. . One of them was it can cause an engine to stall.. It may turn on and run but not for long unless u put it in nuetral at a red light keep the RPM high n not let it stall. . And this is what exactly happen to me. hope this works
585Lowrider 5 months ago
@585Lowrider Don't put a fuel pump in it, replace or repair the main relay and then see if you have fuel pressure. Honda fuel pumps rarely go bad.
EricTheCarGuy 5 months ago
Guys if you go this route pleas de-solder the board first. You can get a solder pump from any electronic store for really cheap. Just heat up the old solder on the board and remove it. Then replace it with new solder.That way you get a clean solder joint. Also if yo utake out the whole piece, drill a few small holes on the sides and on the front of the housing so heat can escape. Make the holes about the same size as the numbers on the front of the housing.
Mataleaoexpert 5 months ago
@Mataleaoexpert I'm not saying that wouldn't be a more thorough job but in my experience it's really not necessary as I've repaired hundreds of these this way and none have come back.
EricTheCarGuy 5 months ago
Great idea pulling the guts out of the relay vs. trying to remove the entire relay. I swapped the new guts into the old body. It made a 2-hours job into a 10 minute one.
kc7ekk 5 months ago
i have a 1986 honda accord Lxi. it starts up in the morning no problem but when i get about 5 min down the street it will shut off at every stop sign or light. So i end up cranking the car back up noticing the rpm is going from 1 to 3 for no reason. my car usually only stopped when my Ac was on, so i dont drive with it on any more but now its still shutting off. Before this happened i unplugged the wires to my main fan because it would kill my battery when i would go to the store
MrGLENWOOD2 5 months ago
@MrGLENWOOD2 It sounds like you may have more than one issue. Start with any check engine lights you might have, if you don't have any look to the general things like tune up items and vacuum leaks. Good luck.
EricTheCarGuy 5 months ago
@EricTheCarGuy thanks, i just looked up the vacuum leak issue. i just noticed that the cap to my distributor is falling off. so thats what has been causing some of the issue right there.
MrGLENWOOD2 5 months ago
@MrGLENWOOD2 Good find, thanks for the update.
EricTheCarGuy 5 months ago
Thanks Eric, I re-soldered the relay under the dash on my daughters 93 accord that had a d4 flashing light. The car would not start when the D4 ight was flashes. I removed the relay from under the dash on the drivers side and un-soldered using a solder sucker and re-soldered all the connections. It's been over a month ago since I made the repair and haven't had the problem since the repair. Great listing. Thanks for sharing. Big help.
mnbhable 6 months ago
@mnbhable I'm a little confused as the D4 is for the transmission and has nothing to do with this relay. The only thing I can think of is a problem with the PRNDL switch not registering that it was in park causing it not to start, the main relay would have nothing to do with that.
EricTheCarGuy 6 months ago
ok so i have a 95 civic with a 98 integra gsr swap one day i was out in my car started it up and in like a min it turned off by itself tried again and same thing took it to the shop and timing is good fuel pressure is good and also getting spark now just cant figure out why it wont start it cranks but thats about it noticed that the intake manifold has like a dark black residue built up in it almost like tar can you please help me out?
airgul24 6 months ago in playlist cARS
@airgul24 If you have any check engine lights start with that but to be honest when you modify something like that it could be any number of things. If you have spark and fuel as you crank I might look to see if you have a large vacuum leak or something. I would also check to see if the plugs were wet with fuel which would indicate a flooded condition.
EricTheCarGuy 6 months ago
I know this to be a fix. I have used it many times on friends Hondas.
The only criticism (and no disrespect intended) I have is that Eric the Car Guys soldering is really bad. His repair is what makes this happen in the first place. Before anyone tries this, they should watch some soldering videos.
hs100 6 months ago
@hs100 Everybody says that about my soldering in this video but honestly I've not had a problem with them coming back. Thanks for your input and for your comment.
EricTheCarGuy 6 months ago
This was soooooooooooooooooooooooooooo helpulf!
playamis 6 months ago
@playamis I'm happy to help, thanks for the comment.
EricTheCarGuy 6 months ago
You might want to clean and tin that solder tip and then you can solder properly so it doesn't happen again.
wjsj69 6 months ago
@wjsj69 Your absolutely right, in fact I'm just going to replace it. Thanks for the comment.
EricTheCarGuy 6 months ago
Is that you covering Pantera - I'm broken in the beginning? Anyway, cool and helpful videos! Maybe I can learn a thing or two.
derleo89 6 months ago
@Eric TheCarGuy I have a 99 honda accord that starts up fine in 100+ weather but after 20 twenty mintues of driving it turns off. I could be at a light or driving 40mph the car will just turn off. I have to wait a couple of mintues before the car will turn on again then it will die and I have to wait again. At night it works fine and not once has it turned off. Can the MFR be the cause of this issue? Thanks.
HJCartman 6 months ago
@HJCartman You need to find out what is missing during the no start to make that determination, if you don't have fuel during the no start then I would recommend starting with the main relay but if you don't have spark you need to explore that instead, watch the No Spark diagnosis for more info on that.
EricTheCarGuy 6 months ago
I just recently bought a 1993 honda accord lx .Superb vehicle , one problem after it rains it doesnt start :( . But then when its sunny it will run like a beast. Do you think the main relay would have anything to do with it ?
FlamingUppercut 6 months ago in playlist Honda Engine Reapir
@FlamingUppercut Nope, I would be checking the ignition for voltage leaks, see the video that I did on voltage leaks to help you find them if you have them.
EricTheCarGuy 6 months ago
@EricTheCarGuy Alright , well ill check that out soon enough . Would that mean i would have to get a new distributor and plug wires ?
FlamingUppercut 6 months ago
I have a 1991 honda prelude 2.0 si. Recently my car won't start when it's been heated up but will start just fine if it's been sitting for a few hours. The other day while i was driving it i randomly lost all power. Do you think that it might be the main relay?
spdwyer06 6 months ago
@spdwyer06 If you don't have fuel pressure that is the first place I would start but with a no start condition the first step is to find out what is missing, spark, fuel, or an engine mechanical issue.
EricTheCarGuy 6 months ago
you are awesome, just re-soldered mine and I love you, it worked, you just saved me so much money, thought it was my fuel pump....Ray and Danell Lugo
1daniray 6 months ago
@1daniray I'm very happy to have saved you from buying a fuel pump, Honda fuel pumps hardly ever go bad and the aftermarket replacements aren't nearly as good. Thanks for the comment.
EricTheCarGuy 6 months ago
@EricTheCarGuy, Wow man you are f@$&ing awesome I just re-soldered and hooked it up and like magic now I have feul pressure too bad that now my battery is too weak
turbomx66 6 months ago
@turbomx66 Glad I was able to help. Now get that battery charged up and go for a spin.
EricTheCarGuy 6 months ago
@EricTheCarGuy , Just took her out and after three weeks of no driving she wanted to just go. I repaired a total of four solder points. Didn't take to long either Thanks again.
turbomx66 6 months ago
Eric, Can you please explain what is the role of the main relay? Is it the same as the fuel relay or is it something else? And how does it cause the car not to start?
Is it the same set-up for othert cars? Thanks.
opsvideo2008 6 months ago
@opsvideo2008 Other cars may use a different set up. Relays are used to control high amp circuits with low current switches, the fuel pump is a high amp circuit so it uses a relay to protect the low voltage side. It's function is to turn on the fuel pump but in addition it also powers other circuits during ignition run, hence the reason it's called a "Main Relay" and not "Fuel Pump Relay".
EricTheCarGuy 6 months ago
@EricTheCarGuy Thanks for your explaination. I really appreciate it.
opsvideo2008 6 months ago
Three weeks ago my 94 accord ex stopped turning on so I changed the starter, then the ignition switch then it wont start unless I jump the starter.WTF. Now its acting like the fuel pump is out but when I was getting towed I dumped it in sec and she started, let it run for 15. The next day nothing. Can you help EricTheCarGuy Thanks
turbomx66 6 months ago
@turbomx66 Stop replacing parts, that's not diagnosing anything just making your wallet lighter. I've done videos on starter diagnosis that I suggest you watch. You didn't specify if it was a crank no start or a no start no crank, if it's a crank no start you need to find out what is missing when it's not starting, spark, fuel, or both. Once you do that you can begin to find the problem. Good luck.
EricTheCarGuy 6 months ago
@EricTheCarGuy--It has no fuel coming in, so that is why I thought at first it was the fuel pump. But after watching your video I removed my main relay and it looks like that is my problem it looks like the second one you showed. And it was doing the crank and no start. Thank you and I will keep you posted, I still have to go to get the soldering equipment.
turbomx66 6 months ago
@turbomx66 Honda fuel pumps hardly ever go bad, if you fix the relay and you still don't have fuel pressure just make sure you check for power and ground at the fuel pump connector before you replace it. Most fuel pressure problems are solved by repairing the main relay however.
EricTheCarGuy 6 months ago
2morrow im buying a 92 honda accord and the dude told me it needed a fuel pump i hope this if the problem
Dillonj177 6 months ago
@Dillonj177 Unless it has an aftermarket fuel pump already in it it's probably not the fuel pump if it's not starting because of a lack of fuel pressure. Honda fuel pumps hardly ever go bad.
EricTheCarGuy 6 months ago
@TheABCWarrior Awesome. I've worked on a couple of Sterlings that were also Honda based, strange machines indeed. Thanks for the comment.
EricTheCarGuy 6 months ago
I had just bought a 93 del sol from my friend about two weeks ago and after about 20 min running i shut off the car and wouldnt start again. long story short, i watched this video, resoldered the joints and voila!!! started right up... no problems since. Thanks again!!!!
Zadonaicam 6 months ago
@Zadonaicam I'm glad I was able to help, thanks for the comment.
EricTheCarGuy 6 months ago
hey my girlfriend has a 92 accord that i believe is having fuel issues. the fuel pump was replaced a few months ago and now the car works then wont work. When i took out the main relay i noticed no sign of cracked sotter, is there something else that could be wrong with the main relay other than cracked sotter??
GanjaGuy36 7 months ago
@GanjaGuy36 In 15 years of working on Hondas I've replaced 2 fuel pumps and both of those were aftermarket. If you don't check for power and ground at the fuel pump connector before you replace the pump your probably doing the wrong thing. You may not see signs of a main relay problem but if you have a fuel pressure issue on a Honda the main relay is always the first place to start as I've replaced more of those than I can count.
EricTheCarGuy 7 months ago
Thanks for the tip, we just went ahead and bought one for my son's 95 Accord. It was only about 50.00 and fixed the problem right away. It took about 10 min to replace. Thanks again!
markberube1 7 months ago
So... just FYI, the Main Relay from my 01 Accord 4CLY2DR looked pretty different. The replacement that I purchased wouldn't fit into the housing of the original. Ended up simply taping it under the dash for security. The stock board had a small area where it appeared that some weathering may have occurred... but nothing that seemed an easy fix with a bit of solder. I still have the old component if anyone wants me to post some pics. Will park the car in the heat tomorrow to test new one.
kingdonkeytron 7 months ago
yep , i had same problem, it was just what you said it was thanks , he put a new one in and im good to go, although i have yet to put it to the test , i ll report back if it doesnt start.
ltigre2031 7 months ago
@ltigre2031 Glad it worked out, thanks for the comment.
EricTheCarGuy 7 months ago
@ggonz003 It's actually the electrical portion of the ignition switch they are referring to I believe and that is a common problem on some Honda's.
EricTheCarGuy 7 months ago
@ggonz003 Yea, first check to see if you don't have fuel pressure before you condemn a main relay, if you have fuel pressure the main relay is not the problem and you need to look elsewhere for the cause of the no start.
EricTheCarGuy 7 months ago
My 93 accord wont start, the other day it would just keep turning over but wouldnt start. then later on it did which led me to believe it was the main relay, but yesterday after driving and going to class then i came out and it wouldnt start. it wouldnt turn over or nothing. it was just a click sound as i turned the key, just one click sound.
llincoln2479 7 months ago
@llincoln2479 I recommend you watch the video that I did Starter Diagnosis 101. Also in the future don't condemn a main relay unless you don't have fuel pressure, if you have fuel pressure the main relay is not the problem.
EricTheCarGuy 7 months ago
i found the problem when i was moving some wires around looking for the relay switch before you responded to my post. well i moved the wires to a brown plug above my fuse box the fan came on and i held it there and it cranked the plug had melted and lost contact i believe. but do you have any idea what this plug may got to and where i can get another. above the fuse box on the right its brown
TheHondaguy18 7 months ago
@TheHondaguy18 Probably the only place you will find one is in a new wiring harness, sometimes they sell connectors separately but not often, you may want to check in a salvage yard and cut one off and splice it in. Good luck.
EricTheCarGuy 7 months ago
Thanks again, Eric! I had a crank, no start problem that ended up being just this. The hardest part of the job was just finding the bugger hiding under the cruise control box. This makes 4 I owe ya. =)
salpta 7 months ago
@salpta Yea they are up in there. Well done and thanks for the comment.
EricTheCarGuy 7 months ago
Hey, Eric, I have a 94 Civic that I have been 'putting up with' for about a year. It starts all the time when it is hot out but when there is humidity or it has rained recently, it takes up to 5 min for the main relay to open and I can start the car. I'm getting ready to get out the Haines and try to replace it. Think that it is the main relay? Thanks!
samcuao 7 months ago
@samcuao Unless you don't have fuel pressure the main relay has nothing to do with it. Given that the problem occurs during high humidity I would look to the ignition system. Be sure you diagnose what you are missing when the car is not starting before you commit to buying any parts.
EricTheCarGuy 7 months ago
i have a 94 honda accord ex 5 spd and i was driving down the interstate and the car just shut off. pulled to the side tried to crank it and it wouldnt ever start wouldnt even click. it doesnt have fuel pressure. my head lights will come on though. any suggestions hope you can reply asap. oh yeah when i bought it in order to turn my radio on i have to turn the lights on if that has any thing to do with it. thx
TheHondaguy18 7 months ago
@TheHondaguy18 Sounds like you may have an electrical issue(s) which makes it impossible for me to say really. You might check the ignition switch since it's not cranking at all, it is common for Honda ignition switches to cause a problem similar to yours. You don't need to replace the entire switch but rather just the electrical portion.
EricTheCarGuy 7 months ago
@EricTheCarGuy I'm guessing this would work on the Acura Vigor '92 too? Hope you can get back to me ASAP! Thanks!
Skimmitar88 7 months ago
@Skimmitar88 It sure would, Acura's are Honda's after all.
EricTheCarGuy 7 months ago
@Skimmitar88 Make sure you don't have fuel pressure first, if you do the main relay is NOT the problem.
EricTheCarGuy 7 months ago
@EricTheCarGuy How would I test this?
Skimmitar88 7 months ago
@Skimmitar88 Watch the video I posted on Checking Fuel Pressure.
EricTheCarGuy 7 months ago
Thanks, Eric! You saved me a bundle. It sure was the MainRelay on my '90CRX. Starts every time now. But, the car is throwing oil up onto the underside of the hood (only while driving) near the driver's headlight. Seems like a lot of oil, but can go weeks without adding. Any thoughts?
waiting4guffman 7 months ago
@waiting4guffman Check the power steering pump for leaks as that may be the real source of the oil leak.
EricTheCarGuy 7 months ago
ok my civic is got a new battery showing 12.86 volts im getting power to the front fuse box and to the starter. well it wont start now. i got really dim lights and when i turn the key to on(ll) there is no dash lights that come on or anything
Kayla557 7 months ago
@Kayla557 I don't believe your problem has anything to do with the main relay. You might want to check the operation of the ignition switch, you might also watch the video I did, Starter Diagnosis 101.
EricTheCarGuy 7 months ago
@EricTheCarGuy ok i watched that video. today i tried to start my car and i have no head lights or dash lights. i do have have the normal lights that come on when i turn the key to the on(ll). when i go to turn my key my mail relay was clicking well i tried to sodder the joints and now when you turn the key on it makes a nosie all the time dont go off till you turn the key off. and when i go to start the car is does nothing i think the lights that come on go out when i turn the key to start it
Kayla557 7 months ago
@Kayla557 It doesn't sound like the main relay has anything to do with your problem. I would be looking for an issue with the ignition switch as I mentioned in my last comment. I would also check the battery and it's connections.
EricTheCarGuy 7 months ago
So my 2000 Accord was having problems starting after sitting in the Vegas heat. My husband researched and figured out it was the relay, but we were planning to just buy a new one. Well after finding this video he tried soldering it and it worked! He did it last weekend and my car has started up right away every time with no issues ever since. Thank you for the tip!
supabrat 7 months ago
@supabrat Comments like this bring a big smile to my face, thanks for posting.
EricTheCarGuy 7 months ago
This has been flagged as spam show
hey thanx for this video..hope u can check out my video and give me your opinion im thinking its my main relay ..ill have to check that out when i get paid tomorrow
stuntnwidhammerz 7 months ago
How do I tell which relay is which? I have a 96 Accord.
icemangixxer 7 months ago
@icemangixxer The main relay is located under the dash on the drivers side normally, just make sure you don't have fuel pressure when your trying to start it, if you have fuel pressure the main relay is not the problem.
EricTheCarGuy 7 months ago
@EricTheCarGuy If the main relay is the issue, is there only supposed to NOT be fuel pressure when the car won't start? So later when all has cooled down and the car starts, obviously there is going to be fuel pressure, right?
zloungeact 7 months ago
@zloungeact Your question confuses me sorry but if you have a no start on a Honda and you know you don't have fuel pressure the first place to look would be the main relay.
EricTheCarGuy 7 months ago
"Main relay" = Fuel pump relay?
jcb1972 8 months ago
@jcb1972 Part of it is, it also powers up the computer circuit if I'm not mistaken. It's called a main relay because it controls more than just the fuel pump.
EricTheCarGuy 8 months ago