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Unread 07-03-2012, 10:50 PM   #1
1998daisy
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1998 XJ Cherokee 
 
Join Date: Jul 2012
Location: Grand Junction, Colorado
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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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Unread 07-03-2012, 10:51 PM   #2
Xpress
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Needs to be posted in the appropriate section.
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Unread 07-03-2012, 10:53 PM   #3
KEH1997
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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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Unread 07-03-2012, 11:09 PM   #4
1998daisy
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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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Unread 07-04-2012, 08:42 AM   #5
CJ7-Tim
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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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