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Old 01-05-2006, 08:34 AM
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Auto Trans Intermittent No Output Problem

Not actually a hot rod but my daughter has a '94 Jeep Grand Cherokee with an intermittent trans problem that I have never seen before.

This trans will be operating fine and then will start free wheeling. No noise, no down or up shifts or any other warning. I pull the car to the side of the road, turn it off, and after a half hour or so it functions perfectly again.

When the prob happens it has no drive in any gear including reverse.

Has anybody encountered this kind of problem before. Oh, yes I have checked the fluid and it is fine.

Thanks for any help.

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Old 01-05-2006, 09:29 PM
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one or more clutch packs or the torque converter clutch is worn enough to cause the filter to become so restricted it cannot flow enough fluid to keep the trans operational. Seen this many times. You can try a trans service (NOT A FLUSH!) but be prepared for the worst...
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Old 01-05-2006, 09:40 PM
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Thanks for the response.

If this is the case I should be able to see foreign material on the filter if I drop the pan, right?
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Old 01-05-2006, 09:45 PM
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Have you checked the fluid itself? I would bet its black and burnt (maybe even way low), which is the same thing Chaz is saying. Its got serious damage. Expect what he said.
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Old 01-05-2006, 09:53 PM
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Check inside the pan......

also check the TPS on the engine. Jeep had a few problematic years with the TPS. Goofy stuff happened
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Old 01-05-2006, 09:53 PM
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The fluid may not be black; sometimes it is just darker and a little charcoal smelly. If you drop the pan, there should be clutch debris in the pan and possibly embedded in the filter. The filters are extremely efficient at removing debris in the fluid; that is why they get so restricted....
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Old 01-06-2006, 06:05 AM
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Quote:
Originally Posted by Chazmac
The fluid may not be black; sometimes it is just darker and a little charcoal smelly. If you drop the pan, there should be clutch debris in the pan and possibly embedded in the filter. The filters are extremely efficient at removing debris in the fluid; that is why they get so restricted....
The fluid was changed about 20k miles ago. It is clear, in fact I compared it to new fluid and you cannot tell which is used and which is new by either color, clarity or smell.

I'll try to drop the pan this weekend to see what I find. What gets me is there are absolutely no symptoms at all until it occurs. No engine flare, perfect shifting, no vibration and no noise. It just suddenly quits and then later comes back and may run fine for days until it does it again.

Thanks again for everyone's help. I need all I can get.
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