Question about 1999 Jeep Wrangler

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98 Jeep Wrangler--acts like it wants to stall/check engine light

I have a 1998 Jeep Wrangler. A few months ago it started this rather unacceptable behavior of seeming to stall, though it never quite does. I've not noticed it happening at speeds less than 30 mph. When this happens, my RPMs will sometime go up and down, and the vehicle will lurch back and forth as if I've just gone over several speed bumps in a row way too fast. After this started I took it to my mechanic twice but they could not find a darn thing wrong. They said wait till it gets worse. So I did. One day it got really bad and was choking and lurching all over the place (without actually dying) and then the check engine light popped on. Yay!, I thought. Now they can identify the problem. Then the check gauge light came on, too. 3 weeks and dozens of tests later, they called me up and said take it back, we have no freaking' clue what's wrong.
So it's still doing it's lurchy thing, and the check engine light stays on constantly. The check gauge light goes off and on, but mostly on, and coincides with the battery voltage reading 0. However, it is a new battery and it has no problem starting. Also, my speedometer will do some really funky business of shooting up towards 90 to 0 to 60 before settling back down on my actual speed, which is usually around 5 or 10 mph when that happens.
The computer was replaced, and no change, so they put back in the old one. Same story with the distributor. Fuel pump, fuel filter, spark name it, the mechanics say they have inspected it all. Any ideas would be appreciated!!!! I would much rather try to self-diagnose!!

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  • hersheychach Sep 29, 2009

    Thanks, co7196! I'll mention this...did some more research and found that a few years ago Jeep did a recall for its catalytic converters. Some of the symptoms sound suspiciously like my problems, so I may give this a go and see what happens. Will post back the results. :)



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If this works,we'll open shop across the street from the dealer and put up a big sign that says we can wrangle with you jeep problems if they can't.
In the intake ducting in a metal section of, you will find what is known as a maf sensor"mass air flow". This sensoer controls or talks to the computer constantly regulating your fuel in relation to the intake air desity and velocity. Yjis sensor is very sensitive and contaminants such as dirt and residues of sort seriously affect what goes on . Pick up a can of CRC electrical cleaner and sprsy was the heck out of both sides of the sensor. Be very careful to not touch, rub or brush the sensor. The spray will air dry and compressed air is forbidden The sensor is very fragile annd very expensive to replace. Wverything clean, Put it back together with a clean air filter. Do'nt go training our factory trained Jeep technicians. Good Luck. Let me know if I am off base.

Posted on Sep 28, 2009



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