just got a jeep for graduation, having problems. HELP PLEASE. - JeepForum.com
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post #1 of 5 Old 07-03-2012, 11:50 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Jul 2012
Location: Grand Junction
Posts: 11
just got a jeep for graduation, having problems. HELP PLEASE.

I need some help. Just got a 1998 jeep Cherokee 4.0 auto. The question I have is after the jeep is warmed up it will start to misfire and act like it wants to stall. If it doesn't stall it will rev up to 2000 ramp then drop to normal idle. It has done this several times if anyone has any information I would appreciate it.

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post #2 of 5 Old 07-03-2012, 11:51 PM
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1996 ZJ 
Join Date: Dec 2010
Location: The Great Big Box
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Needs to be posted in the appropriate section.

All about that unibody life.
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post #3 of 5 Old 07-03-2012, 11:53 PM
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1997 TJ Wrangler 
Join Date: Jul 2009
Location: Richmond
Posts: 295
First--what kind of Jeep do you have...?

Sounds like it could be a bad sensor. If you're a DIY-er, start with the upstream O2 sensor and unplug it from the wiring harness. If the problems stop, then replace that sensor. If not, plug it back in and try others. Could also be an exhaust leak. Check for cracks in the exhaust manifold (especially common on TJs).
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post #4 of 5 Old 07-04-2012, 12:09 AM Thread Starter
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1998 XJ Cherokee 
Join Date: Jul 2012
Location: Grand Junction
Posts: 11
Sorry new to this forum, Its a jeep Cherokee 98 4.0 auto. Sorry the putting it in the wrong forum, which would i go to. I need to fix it ASAP for work. I was sent home early because it was acting up. ):
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post #5 of 5 Old 07-04-2012, 09:42 AM
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2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 25,859
It sounds like you are describing some sensor issues that occur when the the Jeep switches to closed loop operation.

Test the O2 sensors, they can get old and slow to react. Typical O2 sensor service life is about 100,000-150,000 miles.


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bucking , misfire , o2 sensor , rough idle , sputering , stall , stalling

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