Engine idles rough and stalls in reverse?

1992 JEEP CHEROKEE
226,662 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
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ALINDALLASTX
  • MEMBER
  • 6 POSTS
I changed the plugs, they were carbonized, cleaned air inlet, throttle position sensor and the other thing.
Engine idles rough, wont rev up, but when I put it in drive idle improves and while holding brakes down will easily accelerate.
When I put it in reverse, it stalls.
Any idea as to what might be wrong?
I have put in 5 gallons of gas with treatment and octane booster also.
Help!
Aug 31, 2021 at 5:13 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

Wow, that's a tough one. It could be related to the transmission/torque converter not releasing or disengaging the engine.

Let's start by seeing if there are diagnostic trouble codes. This vehicle has an OBD1 system, so you don't need a scanner to check codes.

Follow this link and let me know the results.

https://www.2carpros.com/articles/jeep-diagnostic-trouble-codes-for-car-built-on-or-before-1995-odb1

Let me know what you find or if you have other questions.

Take care,

Joe
Aug 31, 2021 at 2:05 PM
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ALINDALLASTX
  • MEMBER
  • 6 POSTS
The only code is 55.
Is there a connection between the transmission and ECM ?
Sep 1, 2021 at 3:37 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

As far as the transmission, in 1992, they didn't. Do me a favor. Take a look at the pic below and let me know what you feel best describes what you experience. Then, I'll take a look into the specifics.

Also, when in drive, does it ever stall, or is it only reverse? I remember an issue where the transmission cooler lines were partially plugged and causing a stall or issues with reverse. It's a thought at this time. Is the transmission fluid clean and full?

Let me know.

Joe

See pic below.
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Sep 1, 2021 at 12:37 PM
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ALINDALLASTX
  • MEMBER
  • 6 POSTS
Stalls and sluggish in reverse, is the one I would pick.
Sep 5, 2021 at 5:40 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

Okay, the easiest place to start is the transmission fluid condition. A plugged cooler can cause this. Is the transmission fluid clean and full? Here is a link you may find helpful. Also, if I recall, this one is checked in neutral and not park. It will be indicated on the dipstick.

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

Let me know.

Joe
Sep 5, 2021 at 11:57 AM
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