1998 Jeep Grand Cherokee-Stalling problems!

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KSH

Since: Feb 08

Avondale, AZ

#1 Feb 25, 2008
I have read several different articles about Jeeps in other years and models having stalling issues and seem to be right in the middle with everyone else. Seems like this Jeep is becoming a money pit. Have had the vehicle coded twice now and replaced the ignition coil twice along with a fuel pump and still no fix. Have read about the torx bolts on the PCM and will try that tomorrow, but like all of you out there with this problem, mechanics are sucking us dry!!! HELP!!! Is there anyone with a real solution? It seems there should be some sort of recall if this is happening to a lot of Jeep ownwers. Bought this Jeep from a used car dealer and had to have the transmission replaced after only having it 3 weeks. Could it be possible that the crankshaft sensor wire got knicked or damaged and causing a short?
EMR

Lubbock, TX

#2 Mar 27, 2008
This should help. I read the solution on the car forum some time ago, when my 98 Jeep Cherokee had the same stalling problems. The screws are shorting out the board inside the ECM. What you do is back out the screws, located under the plugs, on the front of the ECM (husband says they're a booger to get to and they are torx head screws). Back out the screws 2 full turns and you're problems should be solved (just like mine were). Give it a try. The guy who posted this on the car forum some time ago is a GENIUS! My Jeep is back to normal =:0)
KSH wrote:
I have read several different articles about Jeeps in other years and models having stalling issues and seem to be right in the middle with everyone else. Seems like this Jeep is becoming a money pit. Have had the vehicle coded twice now and replaced the ignition coil twice along with a fuel pump and still no fix. Have read about the torx bolts on the PCM and will try that tomorrow, but like all of you out there with this problem, mechanics are sucking us dry!!! HELP!!! Is there anyone with a real solution? It seems there should be some sort of recall if this is happening to a lot of Jeep ownwers. Bought this Jeep from a used car dealer and had to have the transmission replaced after only having it 3 weeks. Could it be possible that the crankshaft sensor wire got knicked or damaged and causing a short?
Kevin

Tallahassee, FL

#3 May 7, 2008
I tried the screw trick it worked for a week or so before coming back. My local NAPA dealer actually stocks the PCM for this car "because they go bad ALL THE TIME" he also said "I sell more Jeep PCM's than any other PCM" and "a jeep Garage down the street buys one a week". I live in Tallahassee, FL population about 160,000 for 1 mechanic to go through about 52 PCM's a year when he only works on jeeps tells me it is a crappy PCM design. DON'T BUY A USED PCM!!! they are 1/3 the price (about $100) but if it is this common it may work or it may already be bad spend the $321 on a reconditioned one and be done with it if the screw trick dosen't work.
Theresa

Kokomo, IN

#4 Jan 21, 2009
I had stalling and rpm would shoot up then it began backfiring. The mechanic wrote on my receipt. bad connector in wiring harness to pcm. Also R&R n.s. switch
kenya

University Park, IL

#5 Feb 3, 2009
I have a 1998 Jeep and it stalls and I've spent enough money on this truck. I love it but I can't afford to keep putting money into it. I work not to pay rent anymore but to get to work. Thank God for the forum and all the people out there that knows.
Neil

Oxford, MI

#6 Mar 3, 2009
Theresa wrote:
I had stalling and rpm would shoot up then it began backfiring. The mechanic wrote on my receipt. bad connector in wiring harness to pcm. Also R&R n.s. switch
Is there more info available (which connector and what kind of switch)? I am suffering from the same conditions.
HRP

New York, NY

#7 Apr 24, 2009
I had the same problem for my Jeep Grand Cherokee 1998 6 cyl. I replaced all possible sensors, cables, spark plugs, distributor cap, etc. at one point the backfiring was so bad that the mufler exploded. Twice, changed the catalitic converter and the oxigen sensor. Finally tried the PCM screw treatment, Nothing worked, The last try before throwing the car away was to try and exchange the PCM. I bougth a refurbished one from a Floride Co. on Ebay. AND FINALLY, the problem is solved. Have not have the problem recurr since changing the PCM.The car runs like new.
My advise, then, is to change the PCM as soon as the problem shows up. IT is not the sensors, THE PCM GOES BAD>!!!
Good luck everybody
Cawmic

Longueuil, Canada

#8 May 25, 2009
I have a 1998 JGC Laredo 6 cyl auto 4X4, 170km. The jeep starts perfectly and idles fine after about 10-30 seconds of driving, the jeep starts to sputter and appears to want to stall but doesn't. It does this most times but not every time, after about 10 more seconds, the problem is gone and works great until you shut off the vehicle it sits for 10 - 15 minutes, starts all over again. No codes and no check engine light. I recently replaced the speed control sensor to correct another problem would this be related? Any help? Would be greatly appreciated
Email is mkcawthra@eastlink.ca
MileHighCity

Aurora, CO

#9 Jun 6, 2009
120,000 miles 4.0L V6. Jeep Grand Cherokee Limited
Sporadic stalling problems. Vehicle will simply stall and sometimes take a few cranks before it will start up again. I had the Crankshaft Position sensor replaced and that remedied the stalling issue for about a week, then the stalling came back. Next, the ECM was replaced and that solved the problem again for a week. Now the check engine light is constantly on signaling a vacuum leak of some kind. Stalling continues on a random basis.
HughA69

Charlotte, NC

#10 Jun 9, 2009
I had a similar problem with my 93. Dealer wanted to replace wiring harness. Turns out it was the plug to the coil. It would move a little and shut off the engine and usually would start for a day or two. I found it by bumoing the wire with my elbow which shut the engine off. You could move it and at a peticular spot it would work until moved again. I had to pull the plug apart and replace the little pins inside the plug (ford style pins worked).
Jennifer

Dublin, OH

#11 Aug 3, 2009
I also have a 98 Jeep Grand Cherokee and I have spent over $1,000 in the last 30 days because I have the SAME stalling issue - I have had the coil replaced twice, ignition sensor once, the fuel pump relay switch, the PCM (from the dealer) and wires repaired/replaced and STILL it won't work!!! Just stalls, doesn't matter if I am driving or at a light...just stalls. It is sad because I like my Jeep - if anyone figures out the real problem, please let me know...
Steve

Lowell, MA

#12 Aug 4, 2009
I have the exact same symptoms with my 98 GC. It will start and then after, just as you said, 10 to 30 seconds it will start to stumble and hesitate and even backfire if you try to stomp on it. This lasts anywhere from a minute to 5 minutes on mine, then goes away. Last week it simply wouldn't start at all and I replaced the Crankshaft Position Sensor and that cured that, but I think that was unrelated to the running issue. Who knows! And ideas out there would be appreciated. I'm just afraid that one of these days it will turn worse and leave us stranded.
cawmic

Halifax, Canada

#13 Aug 13, 2009
Reference to post may 25 2009, I now have my 98 grand fixed. There are two O2 sensors on hot and one cold. I first replaced the hot (at the converter) that did not correct the problem. I them replaced the front near the manifold? Anyway that fixed the problem. The O2 sensor was about $140 and 1 hour labor. Hope this helps.
Matt

Tampa, FL

#14 Sep 2, 2009
i have a 98 jeep grand Cherokee and i just replaced the crank position sensor and just as im getting ready to pull out of the mechanic shop it stalls. driving it and speeding and slowing down doesn't stall now. i stopped at the store real quick let it run and when i jump into it and put it in reverse it stalls. it seems like its working much better but it stalls still!!!!!!!!!! someone have any idea what i could do to fix this? i have read about the ecm screws but i have no idea what the ecm is, can anyone tell me where to find it and what it looks like on a 4.0?
Nelson

Saint Cloud, FL

#15 Sep 13, 2009
My Problem my truck just turned off out of the blue. I was using it just fine worry free. I pulled up to a gas station and it just shut of on me without any warning. After that, It wouldn't start up again. It would crank over, but not start. I do my own mechanical work so the first thing i checked was the fuel pressure. Pressure was good. I changed the spark plug cables and distributor cap/rotor because there was no current. No luck. I installed a brand new crank sensor and a pick up coil. no luck I the found t burn out resistors. I replaced them and BINGO!!, for now...? The truck started and ran fine, but 15 - 20 minutes later it started misfiring and getting lazier and stalling more and more until it died on me. Would not turn on after that. 1 hour later, it would turn on with no problems at all. 15 minutes after, same thing would happen. I ordered a new computer after checking the fuel pump and making sure the fuses were the correct amps. Still no luck. Please help. anyone out have any suggestions?
Ed F

Metairie, LA

#16 Oct 2, 2009
My 98 JGC is starting with this problem. My wife drives it and it kills on her several times. She can't tell me if it happens on idle or at crusing speed, but after driving it for 3 days now I think this happens at idle and just getting started moving, like pulling into traffic. I am driving it this week and it killed on me once. I changed plugs, wires, distributor cap and rotor. The old plugs looked great when I took them out. I also added Lucas gas treatment in the tank,(about 6 oz. to half tank of gas). But from what I read on the forums, I have to start at the ECM screws and connectors, and work my way through the sensors. I can come to a stop and watch the tach go to zero and then jump back up to just under 1k rpm. It's like the engine dies and then restarts itself. I also had the radiator fixed last month and when I reinstalled it I changed the thermostat, and all hoses. I went with a 180 degree thermostat, and now I wonder if this is adding to my problems. I read somewhere that the ECM is looking for the 195 degree reading for proper operation.
greg

Massena, NY

#17 Dec 7, 2009
i have a 1994 jgc and it starts good for a few min and then it starts to backfire and then it will shut down and won't start for a little bit?
Mack

Clearwater, FL

#18 Dec 22, 2009
I find these symptoms to usually lead to the ignition switch. To test you can wire a pigtail to the negative side of the battery and the other side to the coil. Leave the bulb sticking up between the hood and the cowl. If the bulb goes out when the stalling occurs, suspect a faulty ignition switch. Then you can locate the switch and wiggle the connector at idle and see if your engine stumbles or stalls.
alan

Barnesville, OH

#20 Jan 16, 2010
i have 93 jgc that runs like a deer after cold starts no probs. but once its hot and i turn the engine off it has trouble restarting sometimes (rough idle/stall). the hotter the conditions, the longer i run it, the worse it gets. ive read all the blogs but still dont get a clear picture of what the problem or solution could be. who knows? cause my mechanics sure dont.
R Smith

Brick, NJ

#21 Feb 5, 2010
Theresa wrote:
I had stalling and rpm would shoot up then it began backfiring. The mechanic wrote on my receipt. bad connector in wiring harness to pcm. Also R&R n.s. switch
Did they ever fix your problem?

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