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Thread: black smoke

  1. #1

    Default black smoke

    ok so I've noticed over the past couple of months when ever I really get in my truck it puts out a cloud of black smoke and then goes back to normal. it dont do it when i'm parked, driving normal, and it only puts out that one poof and that's it. I've been told it's running to rich but I have no codes on or nothing so what could it be. thanks for any help
    03 silverado ls model x-cab z71 w/ 5.3l.
    black lo pro toolbox
    ruff country leveling kit
    285/70/17 tera tracs
    stock 17's that are rhino lined
    5% tint

  2. #2
    murdog94's Avatar
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    Feb 2008
    Cloquet, Minnesota, United States
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    Carbon.. It will run rich at start up as the motor is basically "choked" to start then as the EFI takes over and leans out there is no need for the rich condition.
    I would try a seafoam treatment (there are a ton of topics threads on the forum) and see if that helps to clean out the carbon out of the top end of the motor as well as the catalist...


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3


    ive tried seafoam before never really helped, but ill see what i can read on it

  4. #4


    doesn't hurt to try an injector cleaner as well

  5. #5


    yeah ima look into some of them cleaners and if they dont work i guess start checkibng sensors

  6. #6


    well ive have yet to get anything figured out, ive tried running different stuff throught it and nothing. I had a guy at work tell me other day that it might be my egr valve is clogged up or just going bad....anyone know anything bout that?????

  7. #7


    Have you tried the new Seafoam kit for cleaning the intake manifold? Check out the video on Seafoams website.

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