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Thread: Fuel Problem COS-3 E40

  1. #1

    Default Fuel Problem COS-3 E40

    We Are having a problem with a 06 GTO going lean for some odd reason and we are having trouble finding out why its doing it....the car is a 6.0 stock bottem end with ETP LS1 Heads,Cam,APS Twin Fuel Pump,60LB injectors,Aeromotive aeromotive regulator and a F1 A Procharger.

    We was making about 5 PSI at 5800 and everything was fine so we changed the pully to make some more boost and now whenever we hit about 5000-5200 rpm no matter how high we make the boost ve numbers it will allways go lean in the same spot. We are watching fuel pressure and not seeing a drop so we are a little confused.

    Could someone please take a look the file and see if we are over looking something?

    Thanks ,Bill
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    Last edited by Forcefedperformance; July 22nd, 2008 at 10:53 AM.

  2. #2
    Lifetime Member GMPX's Avatar
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    Bill,

    Have you logged what the Airflow g/cyl is at this point? If 'for some reason' it is dopping a lot you will see the lean spike and probably timing go up too.
    Log the PID GM.APCYL_E40_DMA

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3

    Default

    Your right our APC was droping...but why?

    Here is the data log for that car.
    Attached Files Attached Files

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