Mechanics

I'M AT MY WIT'S END, HELP!!!

Jeep Cherokee

I have a 1991 Jeep Cherokee, 4.0 automatic. I went off roading where I took on water. Engine didn't stall and I made it out OK. Engine ran rough for about 5 minutes and cleared up. The 20 minutes drive home was OK and so was the 20mile drive a week later. About a day later I started it up and it idled at 1500-2000 RPMs when normal is around 700-800 RPMs. After a couple of minutes it returns to normal RPM. One time it almost died while idleing for about 5 minutes and got a code " MAP Signal Fault.&Quot;
I drove the jeep for the first time with the high idle and had to hit passing gear to stay ahead of the traffic. When I got into town in 30 mph zone, it didn't want to shift from 1st. Now, all of the time, I have to get the RPMs up to 3000-3200 RPMs and take my foot all the way off the accelerator for it to shift from 1-2 and 2-3 or let it get all the way up to 4000-4500 RPM and it will shift on it's own. Fluid level is OK and not discolored. Disconnected kick-down cable and still the same. I haven't go a clue abot this and don't want to tear anything apart if it is just a sensor or something simple. Any advice would be greatly appreciated. If I can get the help to fix my problem, I would definitely make a donation since it would save me taking it to a shop. I have always fixed my own vehicles.
Avatar
Relliknikcuf
January 23, 2007.



Hey Rell,
Wow! Ummmm. Sounds like a vacuum leak is a good place to start on this one. Inspect all of your vacuum lines/hoses and replace any that may be cracked or broken. Pay close attention to the one going to the MAP sensor too! Let me know!

Chris

Tiny
Carundell
Jan 24, 2007.
Hey Rell,
Wow! Ummmm. Sounds like a vacuum leak is a good place to start on this one. Inspect all of your vacuum lines/hoses and replace any that may be cracked or broken. Pay close attention to the one going to the MAP sensor too! Let me know!

Chris[/quote: 3fa5f40b9e]

Hey Chris,
I can't believe it. It was worse than ever this morning on the way to work, then, going home for lunch and stopped at a red light, I pushed the accelerator and it shifted normally. It's been working well ever since. I will check the vacuum lines anyway, thanks for responding so quickly.

Tiny
Relliknikcuf
Jan 24, 2007.
Your welcome!

Tiny
Carundell
Jan 24, 2007.
Aaahhh! It's doing it again. I left for lunch and it didn't want to shift again. When it ws shifting normal, it also idled normal. So the high idle and shifting problem are definitely related. I also got a new trouble code, 41 Fault in the charging system or no field current. Thanks for your help.

Tiny
Relliknikcuf
Jan 31, 2007.
Is your " kick down" (passing gear) a cable set up or linkage? It may be binding/sticking causing both conditions. Manually operate the throttle from underhood and see if its keeping the throttle open and binding on the kickdown linkage

Chris

Tiny
Carundell
Jan 31, 2007.
It is a cable setup. It goes straight into the transmission with no visible moving parts. I disconnected the kick-down cable the day before it started working again and never hooked it back up. I thought that might be what fixed my problem, but it returned today and the kick-down cable was still disconnected. I'm not sure what else it could be.

Tiny
Relliknikcuf
Jan 31, 2007.
Turned out to be the TPS, funny, no code evr came up for the TPS.

Tiny
Relliknikcuf
Jul 1, 2007.