1994 Jeep Grand Cherokee Stalling Problem

[trs252]

I have a 4.0 6 cyl. Jeep Grand Cherokee Laredo that has 140,000 miles on it. Two weeks ago my 22 year old son jumped his car and crossed the jumper cables on my battery. I was sitting in the Jeep when it happened and the volt meter pegged in the red. He jerked the cables off when I yelled at him, but they were hooked up for 15-20 seconds. Now when I drive at any speed my Jeep just quits running. I pull over and put it in park and it starts right up again and runs fine. This has happened 3 times in the last week at various speeds and driving conditions. Any suggestions on what may have been damaged to cause this?

Tom

[trs252]

UPDATE: I have replaced the fuel filter, air filter and also the exhaust mainfold (it was cracked). I'm still experiencing intermittent stalling. It starts right up again for the most part. The longest that I have had to wait is about 3 minutes. The check engine light has never came on either. Help!!!

[JeepForever]

Sounds like a crankshaft position sensor (CPS). There are plenty of postings on that sensor in this forum. If it dies while driving, try throwing it into neutral and starting it up again while moving. This was my experience on my '94 GC (it died at stop lights and while driving). I didn't have to wait at all before starting it. I might start a "CPS Support Group", as many people's lives have been changed by this goofy little sensor.
Sensor: $60
Wrench and extensions: $20
Stories we hear about how people install these: PRICELESS

Let us know if you need more info.

[trs252]

UPDATE #2 I took my GC to a mechanic and he replaced the fuel pump relay. The Jeep is still stalling on me fairly often. The longest it has taken to start it again is 5 minutes. I told my mechanic about the CPS and he says that it's good. Now he wants to replace my fuel pump. I don't care if he does as it is under warranty and will not cost me a dime. Is there any way that he could have checked the CPS?

[JeepForever]

The CPS can be tested using a voltage test. See the following link at autozone.com:
http://www.autozone.com/az/cds/en_us...rInfoPages.htm

I don't think I had any check-engine codes when my CPS went bad. I replaced it based on what people suggested (having the same symptoms that you appear to have) and the problem was fixed. If you're covered under warranty then let the mechanic go hunting, as long as you're not inconvenienced beyond what's reasonable.

[trs252]

Thank you for the reply. If he doesn't get it fixed today I may attempt to replace the CPS myself.