Auto Repair & Maintenance : Signs of Intake Manifold Leaks

[iimzwing]

@carp60rd

that could be a head gasket leak

[Dystral]

Reading Pa rocks! Lived there in the 70's

[fireicer]

nice advise thank you.

[nookncrannydayton]

good info

nook n cranny dayton

[TheLebnoah]

when do i have to get the heads precision sanded at a machine shop...would that even be nessecary...and how long does the gasket and sealant on the edges have to sit b4 i use the vehicle again?

[panzerveps]

@TheLebnoah you can use your motor after a couple of hours, but it's not recommended to go all out in everything from a couple of days to 2 weeks.

There should be some info on the package of the gasket and sealant.

Locktite says 2 weeks for their products.

[3rdSuspension]

WTF was this!! dumb ass... stay of instructional videos!

[TeDuaMalakie]

thank you comrade ! 

[MegaTmarshall]

Why not just watch your tach vary in rpm's at idle? An intake manifold leak should go hand in hand with a typical vacuum leak and the engine rpm's will not remain steady if a leak is present. If you don't have a tach, you could also connect a vacuum gauge to monitor an inconsistent manifold vacuum pressure at idle. You might also want to check for signs of engine oil in your coolant and vice versa. This is just a different approach to identifying the same problem.

[Mondafied]

LOL, he has Pennsylvanian Accent.

[digitalmixer]

2002 tahoe v8 4.8lt ls vortex

when taking out the intake to get to the knock sensors how do you relieve the fuel injectors so they dont spray gas at you is there a tool or a way,so that doesnt happen

[mirc225]

@digitalmixer ur releive fuel pressure usually by pulling the fuel pump fuse while ur engine is runing.. let it die.. and then try to turn it back up it.. usually it wont because all the fuel pressure is gone because the fuel pump is not pumping any fuel.. just make sure to have some type of shope rag on top of it jus in case it does leak.. good luck

[GMCownsall]

@digitalmixer vortec* sorry i just really hate it when ppl misspell vortec

[digitalmixer]

how do you get to the knock sensors on a 2002 tahoe ls and re place them can you show me how to do it please

[TheGreatCorneliuski]

I've used Quickstart to check for leaks. But it is dangerous. One time I had cleaner in flames but lucky it evaporated right away. You have to have a ready water hose with valve for fire hazard jobs like the fuel pump.

[MininakaHai]

Actually, if you take off the oil cap while the engine is running and the engine automatically shuts off, BINGO!

[mgmjferg89]

i only saw one reply so i responded to that, ford didnt use plastic gaskets, but thats not whats bad on my ride, the actual intake has gone bad. 108,000 miles and its finally there. the plastic tube that goes from my intake to the heater core has a crack at the base of it, leaking coolant down the side to cyl 4 like i mentioned. i've got a new intake sittin at home ready to go, but the same pipe is still plastic, even though the front thermostat coolant passage is now aluminum

[mysubsbang]

maybe there is a way to remove this plastic tube if there is find a copper pipe instead of plastic to put in its place. only bad thing to that if your in a cold envirenment never let it freeze itll break to lol but it should handle the heat better and not crack so soon.

[mgmjferg89]

uhm i have a 4.6 mercury grand marquis. they started to put the 4.6 in lincolns, then crown vics and mgms then cougars and tbirds THEN mustangs.....you must not have read that right... u said there were signs to a manifold leak on regular cars. the 4.6 has a completely plastic intake that cracks and leaks within the coolant passages. MY SIGN ON MY LEAK is its dripping out of the crack onto my #4 spark plug, filling the tunnel and shorting out the current causing a misfire...intake manifold LEAK

[mysubsbang]

it would be a 4.3. a 4.6 is fords new smaller v8 they put in stangs.

[matthagedon]

Personally I would not want to introduce any moisture into the combustion chamber. Water doesn't compress :(

[mysubsbang]

i am a real mechanic as well man good words of wisdom water in combustion chamber very bad idea

[mglrida89]

@mysubsbang i got a question if i may lol my car didnt start bcuz theres water got in to my intake manifold somehow and i took it a part cleaned it.would there be any other damages caused by the water???

[mysubsbang]

did you remove the spark plugs and or replaced them?? possiby water logged there if you did not.

[mglrida89]

i didnt remove either replace any spark plugs but the car just started and i saw "hot and rusty water" leaking out between the bbk throttle body and the intake manifold...im just wondering why???

[mysubsbang]

make a video of whats going on explain and show whats leaking and we can all take turns telling you what it is. some one ill haveexperianced it and tell you the right specific problem.

[cougar1233]

I'm losing antifreeze, about 3 ounces per day from the radiator. My car is 10 years old and has 78,000 miles. It's ford 3.8 liter V6 mustang. The mechanic at the dealership said he said it was leaking antifreeze by the timing cover. He told me it was an intake manifold gasket leak. My car doesn't hesistate, misfire or anything like that. I don't know whether to believe him or not. I'm going to another mechanic for a second opinion. Any ideas are appreciated.

[aikaha]

On my car my water pump is right next to my timing cover, could be your water pump.

[cougar1233]

To aikaha: You have no idea how right you are. Found a new mechanic. Turned out to be my water pump and radiator. Replaced both. So far no antifreeze leaks. Only been a few days since the repair, though.  I have my fingers crossed.

[mysubsbang]

my bad man i shoulda read further along lol

[jasonman1515]

when you have the mustang on, do you see white smoke coming out of the exhaust pipe.

[mgmjferg89]

i've gotta 4.6 in my grand marquis but my intake is leaking from a crack in one of the tubes. you could just be leaking out of the gasket that surrounds the coolant rather than the valve chambers

[mysubsbang]

i think my lumina is leaking like this lol nothing in the engine yet all leaking outside of it so far but soon i am replacing it i have to lol.

[mysubsbang]

probably your water pump ford didnt use plastic intake gaskets.

[stevencprince]

I confer with lillie. Use a gas based scout as opposed to liquid based, since gases will burn out or travel out much faster than liquids... I know I don't want any foreign liquids in my engine...

[Lillie1986]

Actualy I find the best way to find a leak is to use startergas and spray it around the edges of the intake manifold. If the engine changes in revs you know its leaking cause itll suck the startergas in. Its really fast

[michaelheiland123654]

What happen if you have a intake manifold leak and dont fix it?

[Lillie1986]

The car will feel powerless and will hesistate when revving it. It will also increase in idlingspeed the bigger the leak gets. If the leak is big enough it will also make a small hissing sound and youll hear it right away.

[mysubsbang]

eventual the intake will fully blow and leak coolant into your engine siezing it.