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Thread: Misfire code at WOT

  1. #1
    Potential Tuner
    Join Date
    Jun 2014
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    4

    Misfire code at WOT

    Scan_Run_1-5-24-2014.hpl

    I'll admit I'm a newb when it comes to the technical details of tuning. Does anyone have any suggestions based on the file? I'm not sure what is going on here but the knock sensor is going off under hard acceleration and it smells rich at idle. If more information is needed, let me know. Sorry the file is so long, I don't know of any way to clip it to relevant parts.

    The car:
    2002 Trans Am LS1
    6-speed manual

    As far as mods go:
    Unknown cam (the previous owner had it installed)
    SLP y-pipe
    Short-tube headers
    No cats (there wasn't a place for them in the y-pipe)
    Not sure what muffler it has but it is aftermarket

    I can't currently drive it on the public roads but would like to tune it for daily driving.

  2. #2
    Tuner Pur_SSyn's Avatar
    Join Date
    May 2007
    Location
    Kitchener, Ontario
    Posts
    73
    Best to post your tune; there's not enough info with just the scan file.
    2013 GTM Gen.1
    Modified LQ9 w/G96.00

  3. #3
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,214
    Log current misfire counts to see which cylinder is misfiring. Looking at your scan, it appears that a cylinder on bank 2 (pass side) is misfiring as the O2 mv is spiking lean. No cats=exhaust stink.

    Russ Kemp

  4. #4
    Potential Tuner
    Join Date
    Jun 2014
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    I'll have to wait till the weekend to get more data. How can I dump the tune info? (I haven't figured out all the logging features yet.)

  5. #5
    Potential Tuner
    Join Date
    Jun 2014
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    Here is the VCM download.
    full_download_initial.hpt
    I seem to remember one of the O2 sensors on the pass side being missing (but then again I mentioned it to the last place I took it to have work done and thought they put one in). Is there any easy way to tell this based on the recordings?

  6. #6
    Potential Tuner
    Join Date
    Jun 2014
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    4
    Also is it possible to identify a cam based on the tune and logs?