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exhaust smoke after lt and catback install

This is a discussion on exhaust smoke after lt and catback install within the External Engine forums, part of the LSx Technical Help Section category; after installing my headers ory and catback i am getting exhaust smoke. It shows up about 2-3 minutes after startup ...

  1. #1
    Junior Member
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    Nov 2005
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    Michigan
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    30
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    Chameleon
    1999 Trans Am

    exhaust smoke after lt and catback install

    after installing my headers ory and catback i am getting exhaust smoke. It shows up about 2-3 minutes after startup and continues and is a light gray color. Is this just the oil from the mandrel bending stil burning off or is the computer dumping a bunch of extra fuel in the engine due to my not having the rear o2s tuned out yet, or could I have the front o2 insufficient switching errors from the o2s being to far downstream to heat up properly that i have heard people have had
    Last edited by bigcraig987; 09-12-2006 at 09:18 AM.

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Aug 2005
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    2,835

    Met. Sunset Orange
    01 SS

    Yes your car will run a lil rich until you get it tunned but nothing too worry about. Your rear 02 sensors dont serve any purpose but too tell the comp. that your cats are working. I personaly had my front 02's foul out after a few miles of driving due too the ceramic flakin off and contaminating the sensors. Switched them out and was good too go. I would worry about it too much but on the same token is it realy bad or barley noticeable? Could be from another issue and now your noticing it.
    J
    2001 SS, Its not the car its the Driver that matters....

  3. #3
    Member DemonSpeed's Avatar
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    Pewter Metallic
    1999 Trans Am

    does your exhaust smell like gas now? and how long has it been smoking, if its been awhile we can rule out the oil on the pipes
    LS6 Engine swap, Custom Predator Tune, Lid, SLP Cold Air, Ram Air H.O. Hood, Hooker Long Tubes, !Cats, 3" True Duals w/Dynomax Bullets, Performabuilt stage 2 w/3600 stall, B&M Trans. Cooler, Moser 12 Bolt w/ 3.73's

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