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post #1 of (permalink) Old 12-31-2002, 12:58 PM
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Engine problems 97-4.0, need help diagnosing

I am having a problem with my 1997 Grand Cherokee that my mechanic can't diagnose. At highway speeds (65-75 mph) after driving for long periods of time (3 hours plus), the transmision (?) slips out of gear. It does not rev at all. I just lose power to the engine even when my foot is flat on the accelerator. Sometimes, after a few seconds it kicks right back in with a jolt, sometimes it just coasts on along and I need to pull over. After pulling over, I shut the engine, restart, and all is fine, but the problem recurrs after a few more miles. My mechanic can not reproduce this effect in the garage or on a test drive at highway speeds and can not diagnose the problem. I would appreciate any leads/help anyone can offer.

Many thanks.
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post #2 of (permalink) Old 12-31-2002, 05:58 PM
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Re: Engine problems 97-4.0, need help diagnosing

Has he read out the computer? Have you read out hte computer. (& is the last year you can read the fault codes out your self. With out that is is really hard to tell.

post #3 of (permalink) Old 01-01-2003, 02:33 PM
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Re: Engine problems 97-4.0, need help diagnosing

Post this question on the mid-size forum. You'll have better luck. Are you sure the trans is coming out of gear?
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post #4 of (permalink) Old 01-02-2003, 07:37 AM
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Re: Engine problems 97-4.0, need help diagnosing

I would guess that you have already done this, but if you have not it may help. Replace the trans fluid, and filter. Sounds like you might have some build up of gunk in the trans. And after hours the trans fluid is pretty hot, that hot fluid will move faster in the trans because it is thinner, when it moves faster it also does not lube as well, and it will pick up deposits. This can interfear with the valving, and clutches.
You may also consider adding a Trans fluid cooler if you use your Jeep for long hard trips. Let us know how your problem turns out.
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