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Thread: Why no STFT or LTFT data in charts when logging?

  1. #1

    Why no STFT or LTFT data in charts when logging?

    I have a cammed LS1 swapped into an RX7. I got this tune as a mail order base tune and am proceeding now to dial it in. It is an SD tune and from what I can tell is not being forced into open loop, but I am not getting any fuel trim data in my charts, all fuel trims are stuck at zero, so are the histograms, and 02 voltage is flat at ~443mV. Does this indicate I have an 02 sensor problem that might be causing this? Am I missing something in the tune?

    I get all the fuel trim info and varying 02 voltage when I plug into my 09 CTS-V.

    The VE is still a work in progress, I was screwing around with logging here.

    I have attached my tune, config and a log. I hope I attached them correctly.

    Thanks for any help or tips you can provide!

    rx7_log_2.hpl
    rx7_corrected_inj_flow_base_pe_modded overall ve.hpt
    Default Wideband.cfg
    Last edited by LargeOrangeFont; 11-21-2013 at 07:32 PM.

  2. #2
    If your O2 voltage is flatlining at or around 44x mV, that strongly suggests an open circuit on the O2s which will cause a Gen 3 to remain in Open Loop.

  3. #3
    Advanced Tuner Pro Street's Avatar
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    Did you figure this out?
    I have a 5.3 swap into a 1995 Pickup. Had the harness custom built and same guy sent me the 0411 pcm and he had flashed a 2002 5.3 pickup tune into it. Runs and drives fine but will not go into closed loop and O2's are stuck at .447 STFT and LTFT are 0%
    Any help?
    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

  4. #4
    Advanced Tuner Pro Street's Avatar
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    Forgot to post my tune!
    3.73 to 3.42.hpt
    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
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by Pro Street View Post
    Forgot to post my tune!
    3.73 to 3.42.hpt
    Do you have any logs to post? Any DCT codes? Re-enable P0135 and 0155 (SES checked and MIL on Second Error), Any codes now? Check wiring from PCM to O2's. Tune shows CL enabled so O2's s/b toggling or at least moving a bit as well.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

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  6. #6
    Advanced Tuner Pro Street's Avatar
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    Thanks for the info! I will enable P0135 and P0155 and give that a shot. Also I will get a log when I get the intake manifold back on later today.
    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

  7. #7
    Advanced Tuner Pro Street's Avatar
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    Here is a log and tune!

    2nd log.hpl
    3.73 to 3.42.hpt
    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

  8. #8
    Advanced Tuner Pro Street's Avatar
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    Quote Originally Posted by Pro Street View Post
    Here is a log and tune!

    2nd log.hpl
    3.73 to 3.42.hpt
    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