Won't Start When Hot

Discussion in 'PSI Superchargers Tech Questions' started by aort, Jul 16, 2013.

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  1. Mike Canter

    Mike Canter Top Dragster
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    That's exactly why you have to have a change over switch. Nothing like pulling up to start in the finals and it will not. Been there and done that.

    Take a multimeter and read the resistance across the two pins going to the sensor. A good one should measure 42-44 ohms
     
    #21
    Last edited: Aug 8, 2013
    Mike Canter, Aug 8, 2013
  2. aort

    aort Member

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    Mike that was with a changeover switch installed. I started with it on the mag pickup and it started, when the switch was flipped to the crank trigger, the engine died. I made my run with it on the mag pickup. When I got home it started on the crank trigger and would switch between mag and trigger just fine while running. So it has to do with heat and I believe down to the trigger or timing box? I'll ohm mine and see what it says.
     
    #22
    aort, Aug 9, 2013
  3. rb0804

    rb0804 Active Member

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    Did you happen to check the air gap between the wheel and the sensor when it was hot?
     
    #23
    rb0804, Aug 9, 2013
  4. Mike Canter

    Mike Canter Top Dragster
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    Aort,I understand the way around you did it but the crank triggers fail on a too often basis and I am saying that if you are running a trigger them you should also have a change over switch. They always seem to fail when you try to start the car.
     
    #24
    Mike Canter, Aug 9, 2013
  5. aort

    aort Member

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    It's been a while, but I thought I would update. It began running progressively worse. I checked the msd crank trigger again and it was 154 ohms pin to pin. So I put the new one from Leahy on that tested around 44 ohms. I'll run tomorrow to see if that was it. The first time I tested the trigger this year it wasn't nearly that high. What would the higher ohms cause?
     
    #25
    aort, Sep 5, 2013
  6. jody stroud

    jody stroud ZOMBIE Top Dragster

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    Resistance ...:: you can damage one by slightly over tighten it.
     
    #26
    jody stroud, Sep 5, 2013
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