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Thread: firing order change.

  1. #1
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    Default firing order change.

    Can i change the firing order in the pcm rather then re pinning stuff.What i have is a 500 inch bbc with a 4 7 swapped camshaft and id really like to just change the firing order in the tune..Thanks

  2. #2
    Joe (Moderator) joecar's Avatar
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    No... re-pining/re-routing only.

  3. #3
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    Quote Originally Posted by joecar View Post
    No... re-pining/re-routing only.
    Tunercats will do it.kinda a bummer efi live doesnt allow it...I repinned it and got it fired up tonite...thanks for the reply joe

  4. #4
    Lifetime Member GMPX's Avatar
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    I don't think it works like that, the PCM only knows A-H outputs, the wiring team at GM route the wires to the correct injectors/ign coils.
    I no longer monitor the forum, please either post your question or create a support ticket.

  5. #5
    Lifetime Member MICK's Avatar
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    Cough,,LOL never say never
    Rev it up, Drop the clutch, See what happens?

  6. #6
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    Quote Originally Posted by AllOutPerformance View Post
    ... Tunercats will do it.kinda a bummer efi live doesnt allow it...
    Interesting ... with HPT the Gen III firing order is part of the engine diagnostics parameters. I have never changed this, but my assumption was that altering this table was for the purpose of updating the misfire detection algorithm, after repinning the PCM to mechanically change the firing order, as you have done.

    I still learn something everyday ...

  7. #7
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    Watch "Bbc with gm ls1 ecu first fire up" on YouTube
    Bbc with gm ls1 ecu first fire up: http://youtu.be/qTuVPed3HR0

  8. #8
    Joe (Moderator) joecar's Avatar
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    Sounds and runs great, throttle response is instant

  9. #9
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by Taz View Post
    Interesting ... with HPT the Gen III firing order is part of the engine diagnostics parameters. I have never changed this, but my assumption was that altering this table was for the purpose of updating the misfire detection algorithm
    I am of the same opinion.
    I no longer monitor the forum, please either post your question or create a support ticket.

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