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Thread: 5.3 BTR stage2 truck cam. STFT and O2's all over the place

  1. #1
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    Mar 2022
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    5.3 BTR stage2 truck cam. STFT and O2's all over the place

    Folks newish to HP tuners. I am working on a 5.3 out of a 2002 1500 411 PCM

    The truck will idle I have disabled PE and just trying to dial in the maf right now. My STFT is all over the place and the narrow band voltage is also swinging between the banks

    Tune and log file attached

    I don't want to chase my tail tuning if the O2's are Causing issues. they are a bit pain in the ares to get to. The motor is in a YJ jeep crawler

    lila-test-1.hpt stft only.hpl

    Thank you for the help

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Are you sure the o2 sensors are not crossed in the harness?

    One bank is full lean and the other is full rich, that usually happens when the harness is routed wrong.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
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    Mar 2022
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    i will go check tonight, I did not put this thing together just trying to help out my son and his GF I will need to look at the wiring

    Thank you

  4. #4
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    Mar 2022
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    Yup you were correct thank you very much

    Checked the wiring schematic and low and behold they were swapped. changed them and poof it actually runs and drives still needs some tweaks but its enough to get it on the trailer for Best of the West tomorrow in Bend OR