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Thread: Misfires please help. 2006 grand prix gxp 5.3 LS4

  1. #1
    Tuner in Training
    Join Date
    Jun 2009
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    Misfires please help. 2006 grand prix gxp 5.3 LS4

    I replaced spark plugs, wires. check gap.
    torque down plugs.

    i don't notice problem. but when scanning I am getting misfires . less than 25 mph..

    I can post the last scan. small file if someone is willing to help diagonose issue.

    do I have a bad sensor? , no driveability. issues. and no codes so far. besides evap failure.

  2. #2
    Senior Tuner
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    Jun 2005
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    Mobile, AL & Colorado Springs, CO
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    And what sparkplugs did you go to?
    RWTD
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  3. #3
    Tuner in Training
    Join Date
    Jun 2009
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    25
    NGK Iridium/ MSD wire set. 8.5 super conductor.