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Thread: Closed loop not enabling, O2 sensor at fault (I think)

  1. #1
    Tuner in Training
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    Closed loop not enabling, O2 sensor at fault (I think)

    I swapped a 5.3/4l60e into a 68 chevy short step side and deleted vats, rear O2s, that kind of thing. It started up and ran just fine, got my wideband, hooked it up and started tuning it and it never would go closed loop. I don't know what year the engine/trans is from but the wiring harness I got had the wrong connectors for the O2 sensors. I cut and soldered in the sensor plugs off the engine into the harness and I think this might be where my problem lies. I'm not getting much fluctuation at all in the O2 sensor voltage, and if I force it closed loop it just runs more and more rich until it dies. Any ideas?

    In the second log I posted I forced it into closed loop, that is where it went crazy rich.

    Oh, and I have a PLX wideband with the narrowband simulator running bank 1, but it seems to be doing the exact same thing as bank 2.
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  2. #2
    Tuner in Training
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    I forgot to add my config, if it is needed here it is.
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  3. #3
    Senior Tuner SultanHassanMasTuning's Avatar
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    must be that your coolant and air temp are not reaching the needed value to go from open to closed

    also why do you have really high timing at idle, you O2 need to heat up for them to work.
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  4. #4
    Advanced Tuner Pro Street's Avatar
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    I am having the same problem with a 5.3 swap into a 1995 pickup. Did you get this figure.
    2018 GMC Denali A8 6.2L
    2016 CTS-V
    2016 C7 Z06 A8
    2016 C7 Z06/Z07 A8 vert
    2015 Chevy SS 6.2 LS3 A6
    1996 Impala SS LT1 CAI
    1995 Chevy 1500 5.3 CAI Z06 cam
    1957 Chevy vert

  5. #5
    Advanced Tuner Pro Street's Avatar
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    Quote Originally Posted by Pro Street View Post
    I am having the same problem with a 5.3 swap into a 1995 pickup. Did you get this figure.
    Fixed it! Called the guy that made my harness and supplied my pcm. He said I had the wrong O2's. Told me the one's to get and it is working great now!!!
    2018 GMC Denali A8 6.2L
    2016 CTS-V
    2016 C7 Z06 A8
    2016 C7 Z06/Z07 A8 vert
    2015 Chevy SS 6.2 LS3 A6
    1996 Impala SS LT1 CAI
    1995 Chevy 1500 5.3 CAI Z06 cam
    1957 Chevy vert