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Thread: 1987 csx stumble

  1. #21
    Supporting Member II Turbo Mopar Contributor
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    Re: 1987 csx stumble

    Is it still good with the alternator field coils off??
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  2. #22
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: 1987 csx stumble

    from experience I know the tps can go without code
    from reading I understand so to can the speed sensor

    reading the first paragraph of your first post I note it drive differently when you push your foot further down .. using a less traveled portion of the tps sensor (????)

    like the gauge dimming in your cluster when old might only work at the brighter settings because the little coil in it is burned up or worn from the contact

  3. #23
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    Re: 1987 csx stumble

    Miles, I never actually removed the wires for the field coil, I disconnected the main output wire. I should put it back to stock for diagnostic purposes. Maybe wire in a toggle switch for diagnostics from the inside of the car.

    The tps is reading properly on the scanner and doesn't really seem tps related. It's running rough at all times including idle when it acts up.

  4. #24
    Supporting Member II Turbo Mopar Contributor
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    Re: 1987 csx stumble

    Oh want is the O2 reading when acting up?
    My DD was acting up when I decided to change the O2 just for giggles as the ECU had no codes. A new NGK O2 fixed the issue. Detail are on this site..but I could not find in 5 minutes searching.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  5. #25
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    Re: 1987 csx stumble

    When acting up, the o2 cycles as expected on the drb2. I went after the source and went after the field coil part of the alternator. Basically,I removed the fan for access and wired in an interrupter switch to the field coil. BINGO !!! Thats' exactly it. I ran the wires long enough to reach into the car , if needed.

    The car acts up, I flip the switch to open the field, and the car runs perfectly (obviously not charging). Flip the switch back and stumbles return.

    So.... I'm a SMEC guy. Is the voltage regulator in the LM or PM? OR just wire in an external regulator and call it a day?

  6. #26
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: 1987 csx stumble

    it's in the pm
    just add a regulator

    mine were easy to figure out .. the car died when the battery did

  7. #27
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: 1987 csx stumble

    It's pretty easy to switch to an internally regulated alternator too.

  8. #28
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    Re: 1987 csx stumble

    I'll be searching for an external regulator today if any stores are open on this Canadian long weekend.

  9. #29
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: 1987 csx stumble

    fyi Standard auto wreckers seems to have their u-pick up and running again

    drove past last week there was customers parked along the street once again

    been a long two years without handy parts seven min away..
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  10. #30
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    Re: 1987 csx stumble

    Good to know standard has re-opened! I picked up a used PM today and I'll install it tomorrow, but keep the bypass switch just in case. I'll keep this updated over the next couple days.

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