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Thread: 0411 Swap, Tach is off

  1. #1
    Senior Member
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    Default 0411 Swap, Tach is off

    Ok I swapped my old vortec box outta my 2000 S-10 4x4. Now the tach is off, and I played with all the tach multipliers nothing has helped? The engine is 4.3L V6 too. Do I need a cluster outta a 02 to be compatiable with the new pcm?. It seems that the pcm needs to put out more pulses. The stock seting is 1 in the tach box, and increasing the number only makes it worse.

    Thanks
    Kurt

  2. #2
    Lifetime Member GMPX's Avatar
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    Kurt, 1 is of course the lowest it will go, if it's still not right then there is nothing you can do in the tune.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
    Lifetime Member ChipsByAl's Avatar
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    Is your tach reading higher or lower than it should be?
    Al
    "Trash that carb and get Injected!"

  4. #4
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    lower, when is supposed to be 700 rpms it says 500, when it get to 1100 rpms displayed the actually rpm is 2000

  5. #5
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    okay i hooked up my tech 2 and read the input rpm is says it is receiving, PCM rpm was 700 and deplayed input to tach was 500, it varies worse as rpms come up, I am going to swap pcm's may have a bum tach output, do the old ipc's from s10 get it's tach info from class 2 or tach input.

    everything else works great fuel temp speedo.

    Thanks
    Kurt

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