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Thread: Black Smoke...

  1. #1

    Angry Black Smoke...

    Hi Guys,

    So i have a 2001 GMC Sonoma with a 4.3 V6. That is now sluggish on take off and blowing black wet smoke out the tailpipe. The code scanner is saying it detected a random misfire has anyone had this problem before??

  2. #2


    Black smoke is usually a sign of incomplete combustion. Could be from a poor, or no, spark; could be from too much fuel in the fuel/air ratio.

    If the code reader is saying you have a mis-fire, that's the place to start.
    Are the plugs old?
    What are the condition of the plug wires?
    Condition of distributor cap (I think the '01 used a cap)?

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3


    Thanks RayVoy,

    I will have to defiantly check those out Monday morning

  4. #4


    So this morning it had a new code P0327 Knock Sensor 1 Circuit Low Input (Bank 1) sounds like im going to have to replace the Knock Sensor... Has Anyone replaced the knock sensor yet and how hard is it to do??

    Truck has no Mods and 250,000 Miles
    Last edited by LawteyFL; 10-22-2012 at 10:45 AM.

  5. #5


    If I were you , I'd put a fuel pressure gage on it first. Key it on and check the pressure, then make sure it holds pressure when off. It sounds to me like your fuel pressure regulator is leaking pressure and fuel into the intake.
    Good Luck and God Bless
    Remember that if you're not part of the solution, then you're part of the problem!

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