1998 Jeep Grand Cherokee-Stalling pro...
KC Bill

Dallas, TX

#83 Feb 23, 2011
97 Jeep GCL Stalls. I'm thinking about buying a used PCM to replace old and fix my stalling problem? Has anyone had luck with backing out the screws?
TheAnswer

Garland, TX

#84 Feb 25, 2011
eddieo90 wrote:
i have a 98 grand cherokee V6,no spark during cold temp,but when its warm it starts right now,runs like a baby ,,i replace everything from the plugs to the pick up coil.still no luck any1 had this problem ..........please help ,its eating all my money !!!!!!!!!!
Eddie:

1. One get it diagnosed at Autozone for free

2. If there are no codes and it still stalls, replace the PCM.
It takes all of 10 minutes to do.

3. If it still stalls replace the crankshaft position sensor,
a shop will need to do this or a mobile mechanic.

I did the PCM fix, it worked fine for 8 months, then stalled out all over again. Just get yourself a new PCM they are only about $200.
Miles

Bowie, MD

#85 Feb 27, 2011
Whats up with this car. Why can't find a fix for our problem. I had my car in the shop three times, and the Mech. cannot find any problem. Since so many cars are having the same problems, with different fixes solving the problems tells me that there is a problem that Jeep will not address. How can we keep buying these cars if we cannot find a fix. I am so fustrated with my 1998 GC. I have replace oxygen sensor, crank, cam sensor PCM map. who knows the real problem with this car. Is meant to self destruct after a certain mumber of miles. I wish I would have traded it in on the clunker program. Who owns Jeep now? maybe we can get help from them so that can keep the brank,
shane

Vermilion, OH

#86 Mar 7, 2011
EMR wrote:
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)
<quoted text>
has any1 tried the tps sensor it is @ 40 bcks
Damin

Orlando, FL

#87 Mar 11, 2011
I have a 1998 Jeep Grand Cherokee Loredo i have all the same syptoms stalling for no reason, starting right up then driving fine for a bit then studders like it wants to go off have to put it in nuetural so it wont stall. I have replaced the Battery, Alternator, Ignition Coil, Power Steering pump, Crank sensor, tommorrow i am going to install a new ECM hope this works i have found a web site www.dyingjeep.com hope this helps.
zatt14

Mount Morris, MI

#88 Mar 14, 2011
Take a look in the fuel hole under gas cap. Make sure the center of that spring flap is still there. It's the exact size of the fuel pump intake hole. If its missing chaces are it's floating around in the tank until it gets sucked up over intake on pump. Another thing to try- when it starts to stall turn right to left sharply like you see race cars do when they warm up tires or run out of gas. If it takes off there is somthing in the tank. Hope this helps prevent a nervous breakdown for somebody, was too late for me.
Damin

Orlando, FL

#89 Mar 16, 2011
Replaced the PCM no problems since thank god hope it stays running well.
Corey

Pelham, AL

#90 Apr 8, 2011
I am having a problem with the sputtering and stuff on my 1998 jeep Cherokee sport inline6. It's not over heating and it stays on 210 and the oil guar is always on 80 is that okay? And back to the sputtering I have changed the oil an had a whole tune up done had the gaskets replaced and head checked and it just got worse. I then took it to my personal mechanic and as soon as I left the check engine light came on for the first time an I took it straight to advance and had it checked and it came up O2 sensor? I took it completely off and drove it an no sputtering yet knock on wood. I drove it 14 miles one way and 14 back with no problems. I'm thinkig about cleaning it and putting it back on and seeing. Has anyone else had a problem with just the sensor?

Since: May 09

Los Angeles, CA

#91 Apr 10, 2011
Corey wrote:
I am having a problem with the sputtering and stuff on my 1998 jeep Cherokee sport inline6. It's not over heating and it stays on 210 and the oil guar is always on 80 is that okay? And back to the sputtering I have changed the oil an had a whole tune up done had the gaskets replaced and head checked and it just got worse. I then took it to my personal mechanic and as soon as I left the check engine light came on for the first time an I took it straight to advance and had it checked and it came up O2 sensor? I took it completely off and drove it an no sputtering yet knock on wood. I drove it 14 miles one way and 14 back with no problems. I'm thinkig about cleaning it and putting it back on and seeing. Has anyone else had a problem with just the sensor?
Bad O2 sensor(s) cannot cause stalling or sputtering...PCM has a failsafe for that event called default or limp-home mode...your problem is the PCM.
Stephen Townsend

Gravesend, UK

#92 Apr 16, 2011
Jeep was stalling after 20 mins, used logic, went through forums, checked cleaned fuel tank and pump, new fuel filter, all new sensors everywhere, new coil, rotor, dist cap and battery, new pcm including playing around with the screws on it, all a complete waste of time and money.
Thought is was the crank sensor, bought 3 and still the same problem, but 2 things made the difference, one forum said only use an original crank sensor and the haynes manual said to ensure end of sensor had the piece of paper (that's supposed to be there)on the end. So I glued a suitable piece of paper to the end of each sensor I had and one (from a scrapyard) worked and has done ever since. Lesson learnt - cheap crankshaft sensors not worth it, the magnet is weaker and neither of my 'new' sensors had the paper disc on.
The genuine sensor that arrived both has a stronger magnet and the disc of paper, will save for next time.
No error codes were shown, it was only logic and these forums that kept me going back to the crankshaft sensor. Only tip I would give is to install new sensor but not put bolt in until you know its working, it allows you to swap them easily!
Michel

Yorktown Heights, NY

#93 May 12, 2011
MileHighCity wrote:
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.
Check the EGR. Do a smoke test.
smavny

Brentwood, NY

#94 May 26, 2011
I have a 1998 Jeep wrangler Sport 4.0 liter, 6 cylinder, manual tranny. Took it to Jeep dealer 2 weeks ago, needed a new cam sensor and they updated the computer...ran GREAT for 2 days. Now it wont start. Re-set the computer by disconnecting the battery and it starts, then shuts down. Now Jeep is telling me, needs a new ECM!! No reading from the cam/crank sensor. What gives? Can the update from 2 weeks ago kill my ECM?
Don - Peoria IL

Peoria, IL

#95 May 26, 2011
smavny -- from MY experience, I would bet it was the PCM all along. If replacing (the computer), be sure to also do the cap/rotor and plug wires.
veryblueflame

Pittsburgh, PA

#96 May 29, 2011
We just bought a 1998 Jeep Cherokee Sport real cheap. It will start, but dies very quickly and will not re-start until it sits for a bit. We thought it might be a plugged fuel filter since when it runs, it runs like a top. Do we have an ECM or a PCM? Or both? I am confused by these two computer references. Any help would be appreciated as we will be fixing it ourselves. We live in a very rural area with no competent mechanics withing 100 miles. Thanks!
Fremming

Herlev, Denmark

#97 May 29, 2011
veryblueflame wrote:
We just bought a 1998 Jeep Cherokee Sport real cheap. It will start, but dies very quickly and will not re-start until it sits for a bit. We thought it might be a plugged fuel filter since when it runs, it runs like a top. Do we have an ECM or a PCM? Or both? I am confused by these two computer references. Any help would be appreciated as we will be fixing it ourselves. We live in a very rural area with no competent mechanics withing 100 miles. Thanks!
ECM or PCM is the same name for the computer manageing the motor.
The fault seems to be the computer and not the filter as the car is running troubleless after changening from open to closed loop in the SW.

Since: Feb 08

Location hidden

#98 May 30, 2011
Fremming wrote:
<quoted text>
ECM or PCM is the same name for the computer manageing the motor.
The fault seems to be the computer and not the filter as the car is running troubleless after changening from open to closed loop in the SW.
Thanks for your response. How can we tell if it's the ECM/PCM?

Reading all the posts about this type of problem makes it very confusing deciding what to try first. It has been sitting for more than a year because the former owner did not take the time to figure out what was wrong with it. All he could tell us was that sometimes it starts, and sometimes it doesn't. When we picked it up, it started fine and we loaded it onto a trailer to bring it home. Once home, we could not get it to start again until the next day. Any other comments about what this problem might be will be appreciated.
Fremming

Herlev, Denmark

#99 May 30, 2011
itsjustval wrote:
<quoted text>
Thanks for your response. How can we tell if it's the ECM/PCM?
Reading all the posts about this type of problem makes it very confusing deciding what to try first. It has been sitting for more than a year because the former owner did not take the time to figure out what was wrong with it. All he could tell us was that sometimes it starts, and sometimes it doesn't. When we picked it up, it started fine and we loaded it onto a trailer to bring it home. Once home, we could not get it to start again until the next day. Any other comments about what this problem might be will be appreciated.
Do the check engine light up? Draw the codes with a OBDII scanner, output below steering wheel. If codes, repair sensors corresponding. No codes, the computer is normal the problem. Those JEEP-computers did'nt work more than 10 years. Get a new flashed one.

Since: Feb 08

Location hidden

#100 May 30, 2011
No, the check engine light is not on. What is a "flashed" computer?

Since: May 09

Los Angeles, CA

#101 May 30, 2011
OK people. An ECM is the engine's computer (electronic control module). Some vehicles that have separate engine and transmission computers have ECM's and TCM's. In some vehicles both the engine and trans control modules(computers) are in one unit called a PCM (powertrain control module). The Jeep Grand Cherokee has a PCM. When a new PCM is installed in a vehicle, it must be flashed (programmed) so that it will work with the other computers in the veh (like the BCM or Body Control Module which controls things like the alarm sys, etc)...Some vehicles have an epromm chip that must be swapped over from the old to the new PCM, and some makes, models don't need flashing at all (depending on the year) but for the 93 to 98 (at least) Jeep Grand Cherokees, they need to be purchased pre-flashed (Auto Zone, Checkers etc) or if bought new must be flashed at a Dealer for around $100. Check engine light does not have to be on for the PCM to be bad...In my 97 GC with the 4.0 6 cylinder engine, in my case improper/infrequent maintenance caused the spark plug wires to build up too high a resistance and draw excessive pwr, the high ohms in the wires caused power to backfeed into the PCM and burned it out causing it to stall randomly, then frequently. The fix is to replace the PCM along with the spark plugs, wires, distributor cap and rotor to prevent that from happening to the new PCM. Mine's going strong for over a year now.
Don - Peoria IL

Peoria, IL

#102 May 31, 2011
I can second Stelios' comments above. Same problem for me, and the same solution. No more stalling since replacing the PCM, plugs, wires, cap and rotor some time last fall. Pretty inexpensive if done at home -- and not too difficult.

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