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Thread: computer question

  1. #1 computer question 
    Car Enthusiast CF Newbie
    Join Date
    Jan 2009
    Vehicle Profile:
    Grand Prix GT
    I have recently tracked an issue with my 18X reference signal on my 97 GP GT.
    When scanning the vehicle with KOEO,my 3X ref. is 0,and my 18X has shown
    values of 218368 numerous times after letting the engine rest for several
    minutes.Since the engine is not running,I'm thinking the 18X should also be
    displaying 0.The 18X is used for spark and injector timing below 1200 RPM.
    The engine misfires below 1200,but as soon as the speed is raised above
    1200 RPMs all misfires stop.I checked all wires from the CKP to the ICM,
    and PCM for the 18X shorts in those.
    Unplugged pin #4 (18X signal wire) at PCM and rescanned,still shows a value
    with engine not running. Thinking about having pcm re-flashed,but may possibly
    replace it. Does anyone know if this needs replacement or if a re-flash would
    do the trick? I really don't think there should be any value other than "0",
    when engine is not rotating.
    Last edited by gpgt97; 05-17-2011 at 08:53 PM.
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  2. #2  
    not the type of computer i was thinking......
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