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1990 Turbo Grand Prix - Wont Start - Need Help

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  • 1990 Turbo Grand Prix - Wont Start - Need Help

    the car ran perfect, then ran like crap for a little while, now wont start. Definately a electrical problem.

    More info.... after digging deeper into the fuel pump relay, wiring, oil pressure sensor, etc... I found the orange wire(480) going into the relay providing 12.2 volts thus this should mean the oil pressure sensor switch is working, The Green/white wire(D7) from the ECM called "12 Volt pump relay drive" has no volts.
    After doing this i noticed that my dash lights are not turning on properly! The Service Engine Soon Light does not come on, nor does the low coolant light. These lights should turn on when the key is forward as they do in my other TGP and as they did prior in this car as well. The check gauges light is on when key forward, as it always has been..
    Other thoughts... When I was swapping out the ECM one of the times I may have forgot to disconnect the battery cable!, if i did this would it fry a relay or a fusible link?? I have tested both ECMs on the other car and both run flawlessly. I have checked all fuses and tried swapping some of the relays to test them, which ones should i test? Also where should i test fusable links?

    Where do I start to diagnose the problem with the Service engine soon light not coming on when key turn forward.

    ...This is starting to piss me off, I think I may just pull the front clip off this one and but it on the 2nd TGP as thats all it needs!

  • #2
    Wellllllllllll . . . . did you check the fusible links at the starter? Beyond that, you will need to access the ignition switch to check for correct voltage in and voltage out. The fusible links and the ignition switch are the two most likely areas of fault for this scenario.

    If you ain't rock and roll, you must be driving a Honda

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    • #3
      when the key is turned to the run position, the brakes come on as well as other electronics, thus i assume the the switch is good, can i conclude this?

      I will check the fusable link near the starter...

      other thoughts after looking at it earlier and wiggling wires, the fuel pump kick on a few times! I suppose i have a bad wire near the ECM in that mess of wiring jungle n the fender.

      All fuses and relays have been checked,
      checked fusable links near battery,

      I will post more later tonight after checking some more

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      • #4
        After looking at every, fuse, relay and fusable link, i come to find out that the orange wire that powers the ECM was repair in a couple spots! I replaced the whole wire, car now runs and drives like a charm again...

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        • #5
          Sucks you had to go through all that, but at least you were able to find the problem and fix it!
          -Brad-
          89 Mustang : Future 60V6 Power
          sigpic
          Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blog

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