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O2 sensor covered in carbon

This is a discussion on O2 sensor covered in carbon within the External Engine forums, part of the LSx Technical Help Section category; I just replaced both front o2 sensors on my LS1. It has headers, no catalytic converters. The old O2 sensors ...

  1. #1
    Junior Member
    Join Date
    Jun 2015

    2000 Trans Am

    O2 sensor covered in carbon

    I just replaced both front o2 sensors on my LS1. It has headers, no catalytic converters. The old O2 sensors were COVERED with carbon. I assume from the car running rich. What other things could
    Be damaged from the car loading up? Anything else I should clean or replace? It's running good now, but I don't want to ruin my new o2's if there is existing build up somewhere else. Thanks!

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Ugy Lower Corner of AL

    Navy Blue Metallic
    98 T/A w/ mods, 97 FBVert

    How long has it been since a tune up?

    Cleaning the MAF would also help as well as the TB where the IAC is. In the TB on the intake side you will see the IAC port, a lot of times it gets gum up with oil blowby. It doesn't hurt to pull it off and with carb cleaner clean it good.

  3. #3
    Former Mopar Man 2002ssslp's Avatar
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    Jun 2011
    Branchville, NJ

    Silver & Blue
    02 Camaro SS, 04 GTO

    Don't forget to change the plugs as well.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  4. #4
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    An exhaust leak above the O2 senders can induce a false lean condition and result in over fueling. Another possibility is leaky fuel injectors that are dumping more fuel than called for into the cylinders. Crusty air filter is another possibility. Get a read on the spark plugs and then let's go from there.

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