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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
    Senior Tuner
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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
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    You need user defined parameters to define and set something reasonable in the "spark blend factor" table.

  6. #6
    Quote Originally Posted by aaronc7 View Post
    You need user defined parameters to define and set something reasonable in the "spark blend factor" table.
    How would I define my own "spark blend factor"?

  7. #7
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    Quote Originally Posted by 30thta436 View Post
    How would I define my own "spark blend factor"?
    I think he means the spark blend table is not populated in that particular one where it has alcohol content on one axis 0% 25% 50% 75% 100% and you set blend factor (I make it 0.0 at 25% content so on small amounts it does nothing, .4 or so at 50%, and 1.0 at 75% up alcohol content so it does exactly whats shown in table and easy to check the math)


    Can you put up the original OS files you were using, and then the 06 Silverado OS and the manual OS files you combined to get it to work, and labled them with OS ID so people could ID their problems in the future with a search???
    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

  8. #8
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    Correct, here is the spark blend table or whatever you want to call it. It will never add timing with E without reasonable values populated in this table:

    Screenshot 2022-07-07 195920.png