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Thread: No 3rd gear unless fuse #13 is pulled

  1. #1
    Ramblin' Wreck from Georgia Tech RamblinDMC's Avatar
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    No 3rd gear unless fuse #13 is pulled

    Hey everyone,

    My doesn't seem to want to shift into 3rd. It shifts fine from 1st to 2nd at around 4000 rpm, seems a little high??? It will shift into 3rd fine if I pull fuse #13, if I put it back in, it shifts back into 2nd immediately. Bad shift computer?

  2. #2
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    Yes.
    Dave S
    DMC Midwest - retired but helping
    Greenville SC

  3. #3
    Administrator Ron's Avatar
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    I wondering if it could be the Kick Down Switch (WOT) stuck, or its wire shorted to ground (with that high shift point (too)).
    Or, possibly, the GC's 12v supply wire shorted to the one solenoid wire in its harness.
    Last edited by Ron; 01-18-2016 at 03:51 AM.

  4. #4
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    I've never seen either of those issues in a real car. Seen the governor cause problem that dozens of times a year. Go with the common failure mode first. You can test it, but if is an original governor it is almost certainly Bad.
    Dave S
    DMC Midwest - retired but helping
    Greenville SC

  5. #5
    Senior Member
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    Quote Originally Posted by Ron View Post
    I wondering if it could be the Kick Down Switch (WOT) stuck, or its wire shorted to ground (with that high shift point (too)).
    Or, possibly, the GC's 12v supply wire shorted to the one solenoid wire in its harness.
    I think Dave got it right IMHO but it can't hurt to poke around a bit.
    Rob

  6. #6
    Ramblin' Wreck from Georgia Tech RamblinDMC's Avatar
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    I'm pretty sure the kickdown switch is working, it downshifts from 2nd to 1st if you hit the throttle. If it were shorted wouldn't it always stay in 1st?
    I'll plan on getting a new shift computer. Thanks!

  7. #7
    Senior Member AugustneverEnds's Avatar
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    My .02 worth: Say sayonara to the governor. If your governor is still running with the original boards, they are shot or getting closer everyday. Take it out send it to your favorite vendor for a rebuild and rest assured your transmission won't grenade thanks to a malfunctioning governor.
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12
    1989 Jaguar XJ6

  8. #8
    Senior Member
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    Quote Originally Posted by AugustneverEnds View Post
    My .02 worth: Say sayonara to the governor. If your governor is still running with the original boards, they are shot or getting closer everyday. Take it out send it to your favorite vendor for a rebuild and rest assured your transmission won't grenade thanks to a malfunctioning governor.
    Another possibility is the wiring going to the shift computer got melted. It can cause all kinds of strange failure modes. It is worth checking the kick-down switch just in case it is stuck. If you replaced the shift computer and you still had no 3rd gear that is what you would have to do anyway.
    David Teitelbaum

  9. #9
    Ramblin' Wreck from Georgia Tech RamblinDMC's Avatar
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    Just checked the lockdown switch. It's okay. Looks like its time for a new shift governor!

  10. #10
    Senior Member AugustneverEnds's Avatar
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    Quote Originally Posted by RamblinDMC View Post
    Just checked the lockdown switch. It's okay. Looks like its time for a new shift governor!
    Not exactly. You remove the shift governor, send it to the vendor of your choice (DMC Midwest fixed mine, had it back to me in three days and reinstall the same governor with new updated internal "stuff".

    I used this guide to get mine out: http://dmctalk.org/showthread.php?76...matic+governor

    Good luck it's not too bad
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12
    1989 Jaguar XJ6

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