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Thread: G8 ECU, how can you have triple fuel on one bank with 0 fuel trims

  1. #1
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    G8 ECU, how can you have triple fuel on one bank with 0 fuel trims

    Running 17 ms at idle on bank 1 and 5 ms on other bank, at 0 fuel trim short and long terms. How can it be affecting fuel on one bank vs another still in openloop and no fuel trims? If you start it up they are even for first second or so, then as it runs the pulsewidth gets higher and higher vs the other bank on Bank1 till the point you can hear it misfire and sounds like it drops the cylinders in that bank.
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  2. #2
    Advanced Tuner Atomic's Avatar
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    big exhaust leak on that side...

  3. #3
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    at 0 fuel trim... meaning the fuel trims are 0, not adding subtracting any fuel to any bank. Open loop still, cold.
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  4. #4
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    Have a longer log, this is just 21 seconds on a cold start.
    Does it straighten out?
    For kicks did you reset fuel trims before hand?

  5. #5
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    No it doesnt straighten out until you go WOT and get into PE mode, it was set to enable at 3000 rpm stock on this file and soon as it gets there the drivers bank goes to normal with a tenth ms or so of passenger and motor sounds clean. Yep, cleared fuel trims was first button I hit. Longer data looks the same, doesnt do anything differently. The other thing it was doing was setting a P0333 code knock sensor bank 2, but turned all timing retard out of it and deleted code just to see what it did and no change to the fueling issue. Not sure what knock sensor acting fool too, but thats secondary issue to this?
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  6. #6
    in the scanner if you reset fuel trims while the engine is running does it fix it?
    I count sheep in hex...

  7. #7
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    Nope
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  8. #8
    post your tune, this is very weird!
    I count sheep in hex...

  9. #9
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    Are you sure you disabled the trims?
    2010 Camaro SS M6. Stock Bottom End, Heads/Cam/Intake/Headers/Exhaust.
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