Results 1 to 5 of 5

Thread: Help with part-throttle surge/drivability problem (2008 L61)

  1. #1
    Advanced Tuner CatnipG5Bandit's Avatar
    Join Date
    Apr 2013
    Location
    El Paso, TX
    Posts
    297

    Help with part-throttle surge/drivability problem (2008 L61)

    I've had this surge for a while and just lived with it. I don't want to anymore. It is a part-throttle surge around 1400-1700RPM both around 25-30mph and around 40-45mph. It seems to happen worse when letting off the throttle once I reach the desired vehicle speed. Anyone have ideas? My MAF is dialed in well. Down to +/-1%. I have already tried things and here's what hasn't worked.

    OL vs CL. Open loop does nothing to remedy.
    O2 switching voltages. Didn't expect it to do anything but tried anyway. Have since put it back to stock.
    Removed 2-3* timing from surge problem area rpm/airflow
    Throttle follower values.

    Attached is a config and a log. The MAF error isn't perfect on this log but it shows the rpm surge better than any of the other logs I have. I logged tons of table display stuff too. Is this mechanical???
    Attached Files Attached Files
    2008 Pontiac G5 2.2L (main oil seal became a crunchy Autumn leaf, RIP)
    2016 Fiesta 1.0L Ecoboost - Project "not-so-detestable"

  2. #2
    Advanced Tuner CatnipG5Bandit's Avatar
    Join Date
    Apr 2013
    Location
    El Paso, TX
    Posts
    297
    SOLVED SOLVED SOLVED!

    It was the shitty stock TCC duty cycling.
    2008 Pontiac G5 2.2L (main oil seal became a crunchy Autumn leaf, RIP)
    2016 Fiesta 1.0L Ecoboost - Project "not-so-detestable"

  3. #3
    Great job!

  4. #4
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    1
    Hey did you just replace the solenoid?

  5. #5
    Advanced Tuner CatnipG5Bandit's Avatar
    Join Date
    Apr 2013
    Location
    El Paso, TX
    Posts
    297
    Nope. Trans to this day is 100% from the factory except the tune. All I did was set PWM TCC duty cycle to 100% max and 90% min and disabled lockup in third gear because it snaps your neck if you leave lockup enabled in third.
    2008 Pontiac G5 2.2L (main oil seal became a crunchy Autumn leaf, RIP)
    2016 Fiesta 1.0L Ecoboost - Project "not-so-detestable"