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Thread: Upgraded 96 S10 to 99 Vortec PCM now getting misfire

  1. #1
    Tuner jrsmith's Avatar
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    Upgraded 96 S10 to 99 Vortec PCM now getting misfire

    So I have a 96 S10 with the 4.3 which isn't tunable. I installed the PCM out of a 99, it's setup for the same 4.3 engine and everything. After removing VATS it starts up fine but is misfiring on two cylinders. Oddly enough a second 99 pcm which I reflashed is also misfiring. Is this just a massive coincidence or is there some small difference in engine wiring between the 3 years that would cause that?
    Silver 2007 Ion Redline w/comp. package, K04 Turbo, forged 9.5:1 pistons

  2. #2
    Advanced Tuner
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    Quote Originally Posted by jrsmith View Post
    So I have a 96 S10 with the 4.3 which isn't tunable. I installed the PCM out of a 99, it's setup for the same 4.3 engine and everything. After removing VATS it starts up fine but is misfiring on two cylinders. Oddly enough a second 99 pcm which I reflashed is also misfiring. Is this just a massive coincidence or is there some small difference in engine wiring between the 3 years that would cause that?
    Wiring differences on the injectors.

    https://lt1swap.com/painless_96-99_vortec_harness.htm