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Thread: P59 PCM Not Adding Timing For Flex Fuel

  1. #1

    P59 PCM Not Adding Timing For Flex Fuel

    I did not notice any timing advance with E67%. I thought I would have seen at least 5* additional. Any ideas why?
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  2. #2
    Senior Tuner Frost's Avatar
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    I'd try a different OS. It looks right "on paper".
    Steve Williams
    TunedbyFrost.com


  3. #3
    Switched to 2006 Silverado OS and all is working as it should. Lucky I had the 06 Manual File to swap over as well

  4. #4
    Advanced Tuner
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    Jun 2004
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    Quote Originally Posted by 30thta436 View Post
    Switched to 2006 Silverado OS and all is working as it should. Lucky I had the 06 Manual File to swap over as well
    I ran into this once as well. Post up the 06 auto and manual files you have that you switched to, I want to look through my stuff and figure out what it was
    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

  5. #5
    Advanced Tuner
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    May 2014
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    You need user defined parameters to define and set something reasonable in the "spark blend factor" table.