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Anyone ever get black exhaust for a second?

This is a discussion on Anyone ever get black exhaust for a second? within the Internal Engine forums, part of the LSx Technical Help Section category; Anyone ever get black exhaust for a second when you nail it and hit the gas with Headers,Flow through cats, ...

  1. #1
    Face Man Patsy57's Avatar
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    2002 WS6 TA

    Anyone ever get black exhaust for a second?

    Anyone ever get black exhaust for a second when you nail it and hit the gas with Headers,Flow through cats, and cat back?

  2. #2
    Senior Member Zboner's Avatar
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    Black
    99 SS

    yes

  3. #3
    Face Man Patsy57's Avatar
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    Quote Originally Posted by Zboner View Post
    yes
    reason?

  4. #4
    Senior Member Zboner's Avatar
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    Black
    99 SS

    is it not carbon build up?

  5. #5
    wheelin' and dealin' BlueBomber's Avatar
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    NBM
    01 SS M6

    ya id like to know as well, I get that every once in a while @ WOT. Only problem is I dont have nearly all those mods. I figured it was either my pcv system or shitty ass rings goin bye bye...

  6. #6
    Face Man Patsy57's Avatar
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    Quote Originally Posted by Zboner View Post
    is it not carbon build up?
    yea you are probably correct on that one. I need to sea foam my car! Damn stuff cant find it anywhere!

  7. #7
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    sounds like you're just a little rich to me.

  8. #8
    Life's short, drive FAST 2kbluws6's Avatar
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    Blue
    2000 Pontiac WS6

    black exhaust is fuel...blue is oil and white is coolant... It is sorta common when it runs a lil thick at WOT.

  9. #9
    Member BlueMagicSS's Avatar
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    Candy Blue
    2000 Camaro SS

    It's dumping fuel for some reason or other.... no ses lights??? bad tune???

  10. #10
    Face Man Patsy57's Avatar
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    Quote Originally Posted by BlueMagic08 View Post
    It's dumping fuel for some reason or other.... no ses lights??? bad tune???
    Probably needs a good tune. Gonna seafoam it and then hit the dyno.

  11. #11
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    Red
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    Before I had my car tuned it would puff a little black smoke when you first got on it. After LS1 speed tuned it, its a better now.
    1998 Camaro SS Hard Coupe Bright Red #1593
    Mods: Lots!!, still my daily driver except for winter
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  12. #12
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    White Bird, Red Camaro
    91' Bird, 02' Camaro

    Just the signiture of a rich condition...Wide Open Throttle induced. Depends on how the factory tuned it.

  13. #13
    Sarge for AAG Emperor hutch1999's Avatar
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    06 HD Softail
    1998 Trans Am m6

    sounds like your running rich like me...

  14. #14
    The Bandit Wesman's Avatar
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    SGM
    1998 Trans Am WS6

    A small puff of black smoke when you go wide open throttle is normal on any performance engine with high flow cats or without cats at all. When you go WOT, the ECM goes into open loop, so it ignores the signals from the O2's as to whether its running rich or lean. It goes by predetermined values, which are always on the rich side. It is much better to run rich rather than lean under heavy or wide open throttle. Getting the car tuned should definitely help, since it will be adding closer to the proper amount of fuel when you go WOT.

    I've seen stock cars, with cats, puff black smoke when accelerating. My friend had an '05 Cobalt SS Supercharged, and whenever he'd take off hard from a stop, a small black puff would come from the exhaust. They are tuned rich from the factory to be on the safe side.

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