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Thread: odd STFT issue (tune and log attached)

  1. #1
    Tuner in Training
    Join Date
    May 2012
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    odd STFT issue (tune and log attached)

    Have a 2001 corvette. BTR S3 cam swap. Fueling in open loop is looking pretty good on the wideband. When I turn closed loop on STFT B1 goes VERY rich...all the way to the point of adding 50% fuel and wideband shows 10. Run it in open loop and it's around 13.5-14.5 on the wide band.

    02 sensor issue?

    Tune and OL and CL logs attached. Disreguard the wideband AFR in the logs. I don't have the data going back to HP tuners. Watching on my external wideband.
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Well, I see that even in closed loop the sensor are not even switching lean or rich of stoich. They are just kinda stuck around 600mv.

    Are you actually enabling STFT and turning back on the closed loop function in the file, then flashing that.

    Or are you just clicking closed loop with the VCM controls??
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  3. #3
    Tuner in Training
    Join Date
    May 2012
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    Yes changing CL vs ECT back from 250F to stock. I am thinking they are bad o2 sensors or wiring issue. Going to dig into that today and replace.