I had F-150 same problem with code P0174 and P0171 so I test still fail misfare so I put new bank 2 sensor 1 both are new and flow air are new. same problem say misfire somewhere..??
You said the coil on #2 was only getting 10 KV where it's suppose to get 30 KV. what's a KV? A kilo volt? And I guess #2 had 2 problems with the misfire, both the coil AND the injector?
+1 chrytech93 I find fuel trim confusing and complicated, because it's a secondary reaction to a sensor. Even the description lean vs rich seems to be a misnormer, when you're only measuring oxygen, and extra fuel is a secondary computer reaction. But the real reason I don't like it is that you need a labscope to find out how the computer is responding. Without a scope the diagnosis would have been almost as fast. Thanks for posting these videos, Duane.
I like how duane emphasized that new spark plugs and wires is only bring the maintenance interval up to par and then continuing with his diagnosis if necessary.
If the car is not due for plugs and wires, and you change them without testing it, then that can be considered throwing parts at the engine.
Way to go Duane, I like how you explained your approach, very professional in my opinion.
I have the same exact car only in MT and it's a 2000 year model. My Rav4 has over 200,000 miles and I just recently had a random misfire that was due to cheap spark plugs and original (old) wires. Great video but I would have liked to see how you managed to get in there and remove all the injectors from the fuel rail in that tight space.
I know what you said in the video, but I'm kinda-sorta thinkin along the same lines as chrytech93, although he and I part ways in that I actually DO use fuel trims for diagnosing misfires, especially on Fords. It seems like a lot of misfires I've had, the fuel trims were way up due to what seemed to be PCM default action. The O2 sensor has no way to sense unburned fuel, at least none that I'm aware of, so it seems to me that a no-spark miss COULD throw off fuel trim. What do you think about this
@dmorley100 looking at fuel trims, can you distinguish a spark miss from a fuel miss?Like you said, it seems like the pcm always spikes trims as a default action.Not trying to question you, but if can learn something new that could help me that'd be awesome.
@chrytech93 I may have to stretch this out over more than 1 comment. Actually, I've been doin some thinkin on this since this came up, and in most cases, I think you kinda-sorta can. Now the Rav 4 in this video is gonna be an obvious exception to what I'm about to say, but it seems to me most of the time when the PCM ups the fuel trim in response to a misfire of any type, it only bumps it up some.
@dmorley100 It's usually not gonna be an extreme addition cause one, you still gotta think about catalyst protection in this whole deal, and two, in the case of a spark misfire, some of the unburned gas may actually burn while going down the exhaust causing the O2 sensor reading to not go all the way lean while the miss is occuring, whereas in a fuel misfire this wouldn't happen cause there's nothing there to burn.
Hey duane don't forget when it comes to fuel trims the O2's only read OXYGEN.if you have a bad coil then that cylinder is just an air pump.Without combustion you are having large amounts of oxygen going through the o2 sensor whether its coil or an injector not working.I never use fuel trims for misfires.I keep it simple, start w spark, fuel and compression.I have found many toyotas with bad injectors.I'm a chrysler tech though and most of our miss probs come down to spark.very good videos though
@chrytech93 If you have a lack of spark, and that injector is still firing, that cylinder is not an air pump. There may not be any combustion, but you will will have excessive hydrocarbons from the unburnt fuel. That will peg the 02 and you will see fuel trims in a negative value. Now you are correct on the air pump if an injector is bad, but not lack of spark.
@CoolasIce2 ? How would you know if it sprays fuel? If there is power at the harness as the test light diode indicated, what would applying 12 volts to the fuel injector accomplish? I'm not following you.
I compliment you on catching the Coil, as it was firing fine on a lean mixture, but would have failed with dense mixture. So after a new injector you would have found bad coil with lean short term trim.
I compliment you on catching the Coil, as it was firing fine on a lean mixture, but would have failed with dense mixture. So after a new injector you would have found bad coil with lean short term trim.
As usual another great video.
repairdroid77 1 week ago
Awesome work, I learnt alot from this :D ! Keep it up!
vidmanproductions 7 months ago
Duane, can you post a short video of the condition of those spark plugs with 160,000+ miles? Great video!
sbakar 10 months ago 3
I had F-150 same problem with code P0174 and P0171 so I test still fail misfare so I put new bank 2 sensor 1 both are new and flow air are new. same problem say misfire somewhere..??
MILLSAWS 10 months ago
VERUS!!
MeowJW 10 months ago
this is like csi mechanic
ThisUserNameShudWork 11 months ago
you are officialy my grandpa my favorite one ivelearned more from you than anyone else
gus0440446 11 months ago
love your videos...another good site is eric the car guy....also what is the name of that tester u used for the injector sound keep up the good work
cbobcbob100 11 months ago
hi im a upcoming tech i love your videos can u please tell me you bought that spark tester
tamar168 11 months ago
Funny how the scanner didn't pick up on the injector going high resistance. Very helpful post.
monkeytutz2 1 year ago
WOW learned alot in just the first 2 mins. Thank you
calmini4x4 1 year ago
i have a duramax fuel systems problem has anyone had their block fill with diesel and what would cause that
tatonka6969 1 year ago
@tatonka6969 Sounds like a classic case of bad (leaking) injectors. Commom problem on Duramax's. Replace them all at the same time.
dmorley100 1 year ago
@dmorley100 we found a bad return line under the valve cover
tatonka6969 1 year ago
You said the coil on #2 was only getting 10 KV where it's suppose to get 30 KV. what's a KV? A kilo volt? And I guess #2 had 2 problems with the misfire, both the coil AND the injector?
Michiganborn1969 1 year ago
Thank you very much for your videos! We greatly appreciate them.
regnice01 1 year ago
really good diag tips. A great video!
metalxesp 1 year ago
how much is that CAT scan?
murdertriplexx 1 year ago
this guy is the man!
MrSoundQndn 1 year ago
Subscribed.........Eric sent me.
skipwadoo 1 year ago
Two point twenty-two kilo ohms.
Thats almost 1.21 jiggawatts!
mitchellsoree 1 year ago
+1 chrytech93 I find fuel trim confusing and complicated, because it's a secondary reaction to a sensor. Even the description lean vs rich seems to be a misnormer, when you're only measuring oxygen, and extra fuel is a secondary computer reaction. But the real reason I don't like it is that you need a labscope to find out how the computer is responding. Without a scope the diagnosis would have been almost as fast. Thanks for posting these videos, Duane.
spelunkerd 1 year ago
This has been flagged as spam show
I like how duane emphasized that new spark plugs and wires is only bring the maintenance interval up to par and then continuing with his diagnosis if necessary.
If the car is not due for plugs and wires, and you change them without testing it, then that can be considered throwing parts at the engine.
Way to go Duane, I like how you explained your approach, very professional in my opinion.
mss829 1 year ago
Comment removed
mss829 1 year ago
Comment removed
mss829 1 year ago
I have the same exact car only in MT and it's a 2000 year model. My Rav4 has over 200,000 miles and I just recently had a random misfire that was due to cheap spark plugs and original (old) wires. Great video but I would have liked to see how you managed to get in there and remove all the injectors from the fuel rail in that tight space.
trunitemare 1 year ago
could u show me the graph of fuel injector on scaner pls
krmaryum 1 year ago
I know what you said in the video, but I'm kinda-sorta thinkin along the same lines as chrytech93, although he and I part ways in that I actually DO use fuel trims for diagnosing misfires, especially on Fords. It seems like a lot of misfires I've had, the fuel trims were way up due to what seemed to be PCM default action. The O2 sensor has no way to sense unburned fuel, at least none that I'm aware of, so it seems to me that a no-spark miss COULD throw off fuel trim. What do you think about this
dmorley100 1 year ago
@dmorley100 looking at fuel trims, can you distinguish a spark miss from a fuel miss?Like you said, it seems like the pcm always spikes trims as a default action.Not trying to question you, but if can learn something new that could help me that'd be awesome.
chrytech93 1 year ago
@chrytech93 I may have to stretch this out over more than 1 comment. Actually, I've been doin some thinkin on this since this came up, and in most cases, I think you kinda-sorta can. Now the Rav 4 in this video is gonna be an obvious exception to what I'm about to say, but it seems to me most of the time when the PCM ups the fuel trim in response to a misfire of any type, it only bumps it up some.
dmorley100 1 year ago
@dmorley100 It's usually not gonna be an extreme addition cause one, you still gotta think about catalyst protection in this whole deal, and two, in the case of a spark misfire, some of the unburned gas may actually burn while going down the exhaust causing the O2 sensor reading to not go all the way lean while the miss is occuring, whereas in a fuel misfire this wouldn't happen cause there's nothing there to burn.
dmorley100 1 year ago
Hey duane don't forget when it comes to fuel trims the O2's only read OXYGEN.if you have a bad coil then that cylinder is just an air pump.Without combustion you are having large amounts of oxygen going through the o2 sensor whether its coil or an injector not working.I never use fuel trims for misfires.I keep it simple, start w spark, fuel and compression.I have found many toyotas with bad injectors.I'm a chrysler tech though and most of our miss probs come down to spark.very good videos though
chrytech93 1 year ago 4
@chrytech93 If you have a lack of spark, and that injector is still firing, that cylinder is not an air pump. There may not be any combustion, but you will will have excessive hydrocarbons from the unburnt fuel. That will peg the 02 and you will see fuel trims in a negative value. Now you are correct on the air pump if an injector is bad, but not lack of spark.
mikeyred78 8 months ago
Excellent video - very thorough!
sbakar 1 year ago
great vidos,10+
marcopolotm 1 year ago
Great videos. How about leaving all injectors connected to the fuel rail and hooking up 12V to the injector and see if it sprays fuel.
CoolasIce2 1 year ago
@CoolasIce2 ? How would you know if it sprays fuel? If there is power at the harness as the test light diode indicated, what would applying 12 volts to the fuel injector accomplish? I'm not following you.
studpuppy69 1 year ago
@studpuppy69 i should have said to remove the entire fuel rail and injectors to see the spray pattern if any
.
CoolasIce2 1 year ago
great great thanks a lot for your videos
rodrigoelgu 1 year ago
Great videos.
I like the fact that you don't assume that everybody has top of the line tools, you always give ways of testing with more common tools.
jvsee12345 1 year ago
This has been flagged as spam show
thumbs up like always
cipim3 1 year ago
You have the Best Trouble Shooting Vids. !!!!!!!!
Keep them Coming !!!!
OAK91161 1 year ago
The evidence point out that Mr. Injector is GUILTY!
:) Awesome job!
areskzc 1 year ago
I love your vids. It's stuff I know but since I don't have a big fancy scanner like that it's cool to see it in use and how you read it!!
2LateIWon 1 year ago
Thanks Duane!Your videos have made me a better Technician.You run a Professional outfit with a knowledgable staff.GREAT WORK!Keep em coming(videos).
94vettelover2 1 year ago
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I compliment you on catching the Coil, as it was firing fine on a lean mixture, but would have failed with dense mixture. So after a new injector you would have found bad coil with lean short term trim.
Avinash1943 1 year ago
I compliment you on catching the Coil, as it was firing fine on a lean mixture, but would have failed with dense mixture. So after a new injector you would have found bad coil with lean short term trim.
Avinash1943 1 year ago
THANK YOU
michaelovitch 1 year ago
God bless you My friend. Keep going uploading more vídeos!!
xtremecampos 1 year ago
Great video, great logic of finding!
I wish there were mechanic like you nearby
elic123456 1 year ago
good work
coolzaid001 1 year ago
Nice video as always, i like the stethescope method never new that. thanks!
Diesel1Dee 1 year ago
Comment removed
theinfosearcher 1 year ago