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Thread: 07 turbo Tahoe problem

  1. #1
    Potential Tuner
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    Feb 2015
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    07 turbo Tahoe problem

    Any help is greatly appreciated! The problem is that the truck is running strong right after it was tuned.... The problem is that when I put fuel in it, it acts as though it was never tuned for around 5+ minutes of driving time, then it goes back to normal A/F readings in boost, but loses power? And the truck readjusts the fuel tables all on its own? Is there something that needs to be disabled with the flex fuel settings/tables?

  2. #2
    Tuner
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    I would start by checking the evap system. The physical/electrical system not the tuning parameters.

  3. #3
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    It's not the evap system, because I took the gas cap off and it doesn't do it.... Only when any amount of fuel is added. I'm thinking it has something to do with the flex fuel system/tables? Maybe the tuner left something enabled that he was supposed to disable?

  4. #4
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    What do you mean by it "readjusts the fuel tables all on its own" ??
    Post a log and tune if you want help

    VCM Suite V3+ GETTING STARTED THREADS / HOW TO's

    Tuner by night
    CPX Tuning
    2005 Corvette, M6
    ECS 1500 Supercharger
    AlkyControl Meth, Monster LT1-S Twin, NT05R's
    ID1000's, 220/240, .598/.598, 118 from Cam Motion

    2007 Escalade, A6
    Stock

  5. #5
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    The first time I got it tuned at 8-9psi the truck made 450Hp/500TQ, then when I went back to get it tuned for the meth kit I put on the truck only made 384Hp on the dyno before any tuning and the tuner said the fuel tables were all off. He asked me if I had messed with the tune? I informed him of what the truck was doing everytime I would put fuel in it, and he kinda looked at me like I was crazy! Haha. When I left the shop a few days ago the truck made 480/505 with the meth and everything was good until I put gas in.... And I could tell a significant loss in power. I'm positive it has something to do with the whole flex fuel tables/system that the ecu uses to figure out the timing and fueling? Here's a article I found

    http://www.gm-trucks.com/forums/topi...ueling-events/

  6. #6
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    Then post the tune and log. It's simple enough to disable it or to log what it's doing to figure it out.
    Post a log and tune if you want help

    VCM Suite V3+ GETTING STARTED THREADS / HOW TO's

    Tuner by night
    CPX Tuning
    2005 Corvette, M6
    ECS 1500 Supercharger
    AlkyControl Meth, Monster LT1-S Twin, NT05R's
    ID1000's, 220/240, .598/.598, 118 from Cam Motion

    2007 Escalade, A6
    Stock

  7. #7
    Potential Tuner
    Join Date
    Feb 2015
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    I'll be back through Lubbock in a few days, so I'll post up the results then.