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3.1 T engine won't lite off

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  • Question : 3.1 T engine won't lite off

    I have a 91 Lumi with a 3.1T. It ran pretty good then stopped. Last
    July it would lite off run at idle until it warmed up, then sputter and
    die. I had read where these things cook the ICM since it's located
    down it front of the engine and can heat sink cooking it. So I
    started there. Just replaced it today and it still won't lite off. Fuel
    pressure is at 45psi and constant. One time I got a spark off the
    test plug I was using to check spark and it almost fired up, then
    spark died and that's been it. I hooked up my old scan tool to
    it and saw that IPW was at 25.9. That seems excessive. When
    cranking it dropped down to around 17.6. Could it be that I'm
    having a prob with the ECM and that the ride is going into clear
    flood mode cutting the spark ? I know it'll kill the pump till
    it clears. Could a faulty oil pres swt cause the spark to shut off
    at crank time ? All ECM fuses look good. Fuel pump is pumping.

    According to the scan tool, there are no codes and the sensors
    appear to be in range. I'm stumped and could use some good
    tips, advise, or and info.

    Thanks,
    n2gc

  • #2
    sounds to me like the crank position sencor
    sigpic

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