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Thread: Flex fuel enable

  1. 09-24-2021 #21
    tyeler18
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    Post #10 has every version of a P59 OS you'd want. You can segment swap in anything from 80e, flex, 3 bar SD, DBW or cable etc. I'm using this OS for 3 bar SD, flex, DBW and analog AC controls.

    https://ls1tech.com/forums/pcm-diagn...-3bar-dbw.html
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  2. 10-17-2021 #22
    Fast4.7
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    Quote Originally Posted by kgraves View Post
    In my experience, enabling flex fuel in a non flex OS doesnt do anything. I have had to flash the flex fuel tune into my pcm then copy the engine parameters from my original tune file into the flex file and tune from there. It cost extra credits but atleast the flex fuel works as it should
    Weird...I have done it on two different P59s just flipping the switch and it works correctly. 2003 4.3 Express van PCM that went into a 97 turbo S10 Blazer and a 2005 GMT800 L31 5.7L tune that runs my 383.
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  3. 10-18-2021 #23
    Matt Vardaman
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    Quote Originally Posted by fastslvblkcar View Post
    I also don't have the blend factor on either but I do have the eq ratio that wasn't zerod out.
    Did you get it to work?
    Last edited by Matt Vardaman; 10-18-2021 at 12:36 AM.
    2001 Silverado 5.3 - 209/217 cam, GT45 Turbo on 7lbs, Aem x-series wideband, 50lb/hr flex fuel injectors, on E85 with content sensor

    1999 Silverado 6.0/4L80E Summit Stage one camshaft, 317 heads (replaced cast iron)
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