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Thread: 2004 grand prix non supercharged

  1. #1
    Tuner in Training
    Join Date
    Jul 2013
    Posts
    18

    2004 grand prix non supercharged

    i was hoping somebody could look at these logs and tell me if they see any reason the car is knocking soooo much
    its totally nuts how much knock i get...car is a stock 04 grandprix...totally stock

    thx in advance
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,564
    The NA motor are known for have tons of KR stock, it just something they do.

    Though seeing above 10 is kinda worry some.

    Things that can help are:

    91+ gas, it helps more than you think.

    New spark plugs, don't run anything but iridiums or copper plugs.

    Clean the MAF sensor and throttle body real well with the correct cleaners.

    Use a whole can of seafoam in the gas tank to help clean the injectors out.

    Make sure motor mounts are still in good shape, you don't want anything moving to cause false knock.



    Mods you can do to help even more:

    3in downpipe will do tons to help it.

    A powerlog front manifold will help too, or you could buy headers.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.