New Member 93 XJ Help Needed

[bmanis]

Greetings all. I bought a 93 XJ 2WD Auto a few months ago and have enjoyed reading this forum since jumping into the Jeep world.

I've noticed the past couple of months that if I stop at a stop sign at the base of a steep hill, the jeep struggles to have the power to get up it.

Today, if I stopped at any incline, then start up it, it acts as if the jeep jumps put of gear or something and will not advance. Even if I shift down, no change. I had to shift to park, turn off then restart the engine, then proceed in 3 to get up the hill. It runs flawless on level grades.

The tranny fluid level is full and color is light pink.

Can't be a clogged convertor since it hasn't had one since I've owned it.

Possible IAC valve?

Any ideas???

Thanks in advance

 

[Tim_MN]

With some basic search terms in Google you can locate the AW-4 Transmission Diagnostics and Service Manual. Follow the diagnostic and testing procedures.

Some Cherokee owners report shifting issues when using ATF instead of the recommended Dexron-III/Mercon fluid.

Likely suspects are the transmission shift solenoids, Transmission Control Unit, the Throttle Position Sensor, or their wires/wire plugs. Inspect and test them first.

 

[bmanis]

Issues have multiplied now. It will sometimes shift into gear, and sometimes it will not. If I shift into reverse and it actually goes into reverse, then shift into a forward gear, it will at some point lose that gear and then won't actually engage reverse the next time I attempt it. I have to put in park, turn the jeep off, then back on and then back to reverse successfully.

 

[bmanis]

I put another transmission in the XJ. It runs great now if I shift manually. However, ITF I start in D, it seems to start in 2nd or 3rd gear. Not 1st. I tested the harness to my TCU and I'm getting battery power on pin D14, but not getting power from the ignition on D16. I can't find a fuse that would be protecting that in order to test either. Any suggestions?

 

[lawsoncl]

I put another transmission in the XJ. It runs great now if I shift manually. However, ITF I start in D, it seems to start in 2nd or 3rd gear. Not 1st. I tested the harness to my TCU and I'm getting battery power on pin D14, but not getting power from the ignition on D16. I can't find a fuse that would be protecting that in order to test either. Any suggestions?

Not sure what was the last year of this stupidity, but the older Jeeps had a fuse in the wiring harness near the TCU.