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Thread: Odd reduced engine power, '17 Chevy SS, no codes

  1. 10-09-2020 #1
    GrannySShifting
    GrannySShifting is offline
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    Odd reduced engine power, '17 Chevy SS, no codes

    Started doing this and it was a long day so Im just missing something dumb Im sure. Just idling, driving, WOT whatever it randomly pops Reduced Engine Power - but doesnt actually reduce any power? Ended up turning misfires completely off on the chance it was popping up a couple here or there even after I had numbed them down but ended up same thing. Stock throttle body, not tripping past any airflow limits sitting still obviously

    Other thing I just noticed going through log was random knock retard that just held and didnt decay in a no load situation - all burst knock is turned off already
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
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  2. 10-11-2020 #2
    Asd_srt
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    I had my ls3 C6 going into REP without codes. It was caused by engine tq mgmt settings in the tune. I changed them back and it never happened again.

    Disable Tq limit 2 tab under engine-tq mgmt-general- tip in limiting. See if that helps.

    Also set brake tq mgmt to disable, set those settings back to stock but just disable the tab. (engine-tq mgmt-general).
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  3. 10-13-2020 #3
    GrannySShifting
    GrannySShifting is offline
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    Quote Originally Posted by Asd_srt View Post
    I had my ls3 C6 going into REP without codes. It was caused by engine tq mgmt settings in the tune. I changed them back and it never happened again.

    Disable Tq limit 2 tab under engine-tq mgmt-general- tip in limiting. See if that helps.

    Also set brake tq mgmt to disable, set those settings back to stock but just disable the tab. (engine-tq mgmt-general).
    It seemed to be caused by removing speed limiter settings. Put all back to stock and OK?
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
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  4. 10-23-2020 #4
    Brianw36
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    Quote Originally Posted by GrannySShifting View Post
    It seemed to be caused by removing speed limiter settings. Put all back to stock and OK?
    I have this issue with a 2016 camaro ss. My speed limits are not maxed out. What values did you put back to stock? This rep dummy light is so annoying. Nothing is reduced just a light. Mine has even happened before even starting car.
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  5. 10-26-2020 #5
    GrannySShifting
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    Quote Originally Posted by Brianw36 View Post
    I have this issue with a 2016 camaro ss. My speed limits are not maxed out. What values did you put back to stock? This rep dummy light is so annoying. Nothing is reduced just a light. Mine has even happened before even starting car.
    Compare to stock file and reset everything back to OEM
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
    Reply With Quote Reply With Quote
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