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Thread: Check engine

  1. #1
    Join Date
    Aug 2017

    Check engine

    I have a 99 4,8 silverado that has a check engine light that I think was thrown when I installed long tube headers on the truck , I have no cats and I'm wondering how to get rid off the check engine light to pass emissions , I bought a o2 sim and it didn't get rid of it .

  2. #2
    Join Date
    Aug 2011
    New Port Beach, CA.
    nelson performance tune and check for exhaust leaks at heads
    6.0 MAX Blown

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