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Anonymous
Anonymous asked in Cars & TransportationMaintenance & Repairs · 1 decade ago

What Is Causing White Smoke Pluming From Exhaust?

Well first off, I had a leaky fuel rail. 2 injectors had defective O-rings. When I ran the engine for 30 seconds, the fuel leaked out of the injectors and sat there until I pulled out the fuel rail & injectors. I assume the gas then fell back down where the injectors sat. I fixed the O-rings and then put the fuel rail and all back in and started my car (with that possible extra gas inside the chamber). That is when I noticed a great amount of white smoke coming out of my exhaust. I turned off the engine 10 seconds later after starting it. Should I drive around my house for a few minutes and see if it dissipates and then give an update as to whether something elses occurs.

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  • 1 decade ago
    Favorite Answer

    if it didn't happen before you did that it's probably just excess fuel not burning completely coming out in the exhaust run if for a little bit and see if it clears up listening for unusual noises the whole time.

    unburned gas will produce white smoke. excessive gas burning produces black smoke, oil burning produces bluish smoke and coolant will also produce white smoke. seeing as he didn't have the problem before and he just did work to the injectors and got excess fuel in the ports it did not burn it all off when he started the car. so disregard all this stuff about head gaskets and everything else unless you run your car for a while and it still does it then you may want to check that.

    Source(s): I'm a mechanic
  • Anonymous
    5 years ago

    You did not mention anything about the air temperature before you got into the car. Was it nippy, frosty, or hotter than the place "downstairs"? If you can see your breath, you are going to see the car"s breath. This is condensation from moisture inside the exhaust pipe/muffler. That is why exhaust systems rust out. It takes about 5 miles of driving to get all the moisture out of your exhaust. Watch other car tailpipes (it is much easier than watching your own as you drive) Some will smoke a whitish grey and some will smoke blue(oil burner), some black(choke is stuck on or diesel under load so the black is excess fuel burning in the exhaust pipe instead of the engine, and some won't show anything as the engines are warmed up long enough so that the moisture is out(but the cars are still giving off harmful CO2 and poisonous CO at the same rate as the visible smoke ones. Old car or brand new, if you burn fuel you pollute.

  • V2K1
    Lv 6
    1 decade ago

    There are two sources of white vapour coming out the tailpipe:

    -- Water vapour (normal -- goes away after warmup)

    -- Coolant (not normal-- doesn't go away)

    If you have continuous white smoke, I'd suspect the head gasket is toast.

    HTH

    V

  • 1 decade ago

    could just be unburned fuel i would drive it around alittle to see if it stops. white smoke is usually water in the cylinder but some times fuel can look white coming out of the engine. if it was not doing it till you replace the oring i would bet that is what it is.

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  • Anonymous
    1 decade ago

    Usually white smoke is a blown head gasket.

  • Anonymous
    1 decade ago

    White smoke-coolant, water

    Blue Smoke-Oil

    Best bet, look for a new car because it sounds like a head gasket.

  • 1 decade ago

    if its thick white smoke check your oil its definitely oil? if the oil is ok than start the car and leave it for ten mins n c if its reducing but dont drive it if u do u might gonna blow ur engine off.if still nothing happens thank u head gaskit is gone.hope u find it helpful

  • 1 decade ago

    that would be a good idea but dont drive it just let it run and listen for any unusual noises white smoke is normally oil or antifreeze in the cylinder but if all else fails run a compression test

  • 1 decade ago

    Fuel would not be white smoke. Thats coolant. Smell the smoke and if it smells sweet then its coolant. Oil is a darker smoke that almost looks blue.

  • Anonymous
    1 decade ago

    kba1a is correct, you have a blown head gasket. Don't drive it. Unburned gas will produce black smoke, oil will produce bluish black smoke and water will produce white "smoke" (steam).

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