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Thread: Best Way to Change Firing Order

  1. #1
    Lifetime Member
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    Jan 2014
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    Default Best Way to Change Firing Order

    Working on a non-ls platform that has a 24x and 1x sensors added along with 4L60e and DBW. PCM is 0411. Keeping coil on plug.

    The engine/cam is the older genI firing order, 18436572.

    What is the best way to change the firing order in the PCM/harness to match this?

    Are harness mods needed? Or can it be done all in programming?

    I found this link on assignments-
    http://www.lsenginediy.com/gm-gen-ii...-firing-order/

    but it is confusing as it more pertains to making the fuel trims work. I want these work, but I also want to make sure the ignition and fuel injectors are correct.

    Do I swap wires at PCM OR plugs with 4,3 and 7,2 respectively at both the coils and the injectors? Then change(program) the injector assignment table to adjust the banks, as the 5.7L van tune would have? or is there a way to do the swap completely in programing?


    Appreciate any help.

  2. #2
    Junior Member
    Join Date
    May 2016
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    26

    Default

    Swap the wires for the coils at the PCM and change the injector bank assignment in the software. There is no other way to change the firing order.

  3. #3
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    Jul 2003
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    Default

    There is a firing order on the ECU for misfire purposes, so you will need to keep into account that information through out the scanner display.
    "All that is needed for the triumph of evil is that good men do nothing..."

  4. #4
    Junior Member
    Join Date
    May 2016
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    Default

    Good point. Although I haven't had any misfires, I will put that on a post it note so I don't chase the wrong cylinder.

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