Engine idles rough and stalls in reverse?

ALINDALLASTX

MEMBER
1992 JEEP CHEROKEE
4.0L
6 CYL
2WD
AUTOMATIC
226,662 MILES

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!

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 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

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Tuesday, August 31st, 2021 AT 9:05 PM

ALINDALLASTX

MEMBER
6 POSTS

The only code is 55.
Is there a connection between the transmission and ECM?

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Wednesday, September 1st, 2021 AT 10:37 AM

JACOBANDNICKOLAS

MECHANIC
109,885 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.

Image (Click to make bigger)

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Wednesday, September 1st, 2021 AT 7:37 PM

ALINDALLASTX

MEMBER
6 POSTS

Stalls and sluggish in reverse, is the one I would pick.

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Sunday, September 5th, 2021 AT 12:40 PM

JACOBANDNICKOLAS

MECHANIC
109,885 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