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Jeep Grand Cherokee Start Stall Idle Problems

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  • Did you ever get a reason for your Jeep just shutting off when going low speeds? This has happened to me about half a dozen times now. I have taken it to a mechanic but they cannot reproduce the situation. It's becoming very frustrating. Any advice you could give would be great!
  • alby3alby3 Posts: 46
    You may want to check these few things below....
    mine was not that bad. but it shut off like the key was turned off.... no studeer or misfire.... and it always started right back
    got mine fixed with the very last option #3, I HAD TO REPLACETHE BRAIN (ECU) Got mine off ebay for $185 from
    they will program, and ship for that price..... it has a lifetime warranty. It has to be programed for your vin #, part nbr, and mileage.... but they will tell you all that. It took about 35 minutes to swap the part. worked like a charm.......


    grand cherokee stalls or dies out.


    1) CHECK YOUR CONNECTIONS AT THE ECU (ENGINE CONTROL UNIT) MAYBE CALLED THE PCU (POWERTRAIN CONTROL UNIT) ON THE PASSENGER SIDE FIREWALL. ON 1998 AND EARLIER THE 3 PLUGS SOMETIMES GET A BAD CONNECTION. IT IS USUALLY THE ONE CLOSEST TO THE FENDER. UNPLUG, SPRAY WITH CLEANER AND REPLUG. YOU MAY EVEN HAVE TO WRAP A ZIP TIE AROUND THE UNIT TO KEEP THE PLUG IN TIGHT.




    2) FOR 1999 AND LATER

    I had same problem.... 87,000 2000 grand cherokee 4.7l
    when i let off the gas it might stall. happens 1 to 4 times a day.
    so far i have
    replaced the crank shaft sensor - it stopped stalling for 3 days $130
    cleaned the throttle boddy free
    replaced the throttle position sensor $72
    replaced the idle air control sensor $132
    replaced the map manafold airflow sensor $125
    no luck it is still stalling. not sure if i remember the prices
    right on these parts....
    by the way i have done all the work myself. it was about 30 minutes for most parts.
    i just ordered a rebuilt ecu or pcu engine control unit. they program in the vin, mileage and part nbr so you gc will recognize it. $185
    we will see when that comes.....

    IT CAME AND THAT FIXED THE PROBLEM..... BEEN A year.... SO FAR SO GOOD

    alan
  • dana70dana70 Posts: 7
    After replacing many parts along the fire and gas categories I started running high octane fuel in my jeep and it has ran great ever since. Either its a coincidence after the second computer or jeeps just don't like the low grade fuel, but it was still running rough on the way home after getting the 2nd computer so I took my neighbors advice and tried mid grade. The manual for the jeep says 87 grade fuel but the highest (I believe is 92) makes my jeep run great and fuel has probably changed a lot since that book was written.

    Thanks,
    Dana
  • cal65cal65 Posts: 6
    So, with the 2000 GC idling fine, I headed for the inspection station and three miles down the road the car quit like the switch was turned off. Cranked a while and it started and I headed for home. It quit again (cranked and started) just before getting home, which makes it a 3 mile run distance, put on the DTC checker and got a P0320 trouble code (ignitioin distributor engine speed input circuit). It's possible that this is related to the previous idle air valve problem, but unless it's excitation voltage from the computer module, it's unlikely and more likely the crank angle sensor..

    So, I'm currently waiting for the service manual from ebay O(for almost two weeks now). fortunately I have four other four other vehicles to drive and don't want to fumble around making things worse until I have some diagnostic directions.

    will keep youj apprised.
  • I have a 2001 JGC 4.7 that is idling fast 1200-1500RPMs. it normally was at 750 RPM. If I have it in park and give it quite a bit of gas it starts idling normal.

    Any help would be appreciated.
  • I have a 2001 JGC 4.7 that I keep having to fill the antifreeze resevoir. I smell antifreeze slightly occassionally but never have any under my Jeep after parking. Also I change my oil regularly and there is none in it.

    Any help would be appreciated.
  • alby3alby3 Posts: 46
    I would check your throttle body. carbon gets built up and it may need cleaning... a couple of bolts to take it off and clean with carburator cleaner. you may be able to just clean it without taking it off. t
    alan
  • alby3alby3 Posts: 46
    i would check your water pump.... when it starts to go only a little antifreeze comes out and it evaporates when it hits the hot engine. but you may see some water signs around the bottom of the water pump...
    alan
  • i have a 94 jeep cherokee ltd. i have had all the basic tuneup done wires,plugs distributor cap, fuel filter, i had piston changed pick up coil valves checked for leeks. it has about 100 thousand miles and it is a 5.2 v8. for the past three weeks it has been stalling out. temperature gauge is within normal range. the fuel pump is only a few years old. i have not put a fuel temp gauge on it yet. it will run for a while and then stall out. it starts back up after about 10 or 15 min and sometimes it will run a bit longer and sometimes it doesn't. no one seems to know what the problem is and i am not trying to spend a fortune for another mechanic. i have also been reading a lot of forums and this seems to be a problem with this car. can you please tell me what I might need to do to fix this. i do not think it is the fuel pump because when you put the key in and turn it, i had someone laying underneath to see if they could here it come on and it does. please help. i am at a loss. thanks
    donna maler
  • has anyone answered this question? as my 93 grand cherokee has the same issues. after warm up it spits and sputters at times but not all the time. we have changed the crank position sensor, also cam position sensor, then rotor button cap,and wires and plugs. at my wits end with this durn jeep. can any body help?
  • 1996 jeep grand cherokee larado dies after it warms up, already changed map sensor, fuel relay, fuel pump, and new battery
  • I just wanted to say that I say this same code posted on a different thread P0320 trouble code (ignitioin distributor engine speed input circuit). They had stated that it was a crack shaft position sensor. Just thought I would try to help.
  • frenchi187frenchi187 Posts: 2
    edited November 2010
    I drove my jeep around for bout 1/2 hr last night no problems then once again it started sputtering and died on me i put my code reader on it and 6 different times it said it was saying it was my cam shaft sensor (96 Grand Cherokee Laredo) please help i've changed fuel relay, fuel pump battery , map sensor I really need some help PLEASE,PLEASE (HELP) anyone it is my only vehicle, I also had the crank shaft sensor changed
  • tuggajbtuggajb Posts: 646
    change the crank sensor again could have got a bad one or if tightened to tight could have broken it
  • alby3alby3 Posts: 46
    You may want to check these few things below....
    mine was not that bad. but it shut off like the key was turned off.... no studder or misfire.... and it always started right back.
    I had no codes....
    got mine fixed with the very last option #3, I HAD TO REPLACETHE BRAIN (ECU) Got mine off ebay for $185. they will program, and ship for that price..... it has a lifetime warranty. It has to be programed for your vin #, part nbr, and mileage.... but they will tell you all that. It took about 35 minutes to swap the part. just unbold and disconnect the plugs and then plug up the new one. worked like a charm.......

    I think your problem might be one of the sensors.
    and by the way the sensors are very easy to replace, remove a couple of bolts and swap them out. save yourself $90 in labor. I did not mind replacing the ones that were actually good because I figured they were getting close to the end of their life anyway.

    grand cherokee stalls or dies out.


    1) CHECK YOUR CONNECTIONS AT THE ECU (ENGINE CONTROL UNIT) MAYBE CALLED THE PCU (POWERTRAIN CONTROL UNIT) ON THE PASSENGER SIDE FIREWALL. ON 1998 AND EARLIER THE 3 PLUGS SOMETIMES GET A BAD CONNECTION. IT IS USUALLY THE ONE CLOSEST TO THE FENDER. UNPLUG, SPRAY WITH CLEANER AND REPLUG. YOU MAY EVEN HAVE TO WRAP A ZIP TIE AROUND THE UNIT TO KEEP THE PLUG IN TIGHT.

    3) FOR 1999 AND LATER

    This was my problem.... 87,000 2000 grand cherokee 4.7L
    when i let off the gas it might stall. happens 1 to 4 times a day.
    so far i have:
    replaced the crank shaft sensor - it stopped stalling for 3 days $130
    cleaned the throttle boddy free
    replaced the throttle position sensor $72
    replaced the idle air control sensor $132
    replaced the map manafold airflow sensor $125
    no luck it is still stalling. not sure if i remember the prices
    right on these parts....
    by the way i have done all the work myself. it was about 30 minutes for most parts.
    i just ordered a rebuilt ecu or pcu engine control unit. they program in the vin, mileage and part nbr so you gc will recognize it. $185
    we will see when that comes.....

    IT CAME AND THAT SEEMS TO HAVE FIXED THE PROBLEM..... BEEN A year.... SO FAR SO GOOD
  • My 2000 Grand Cherokee was also stalling. It would start and then immediately die. Took 3 or 4 times to get it going. Then it would just die while I was driving it. Took it to the Jeep dealer, they'd never heard of the problem. But the service man said it could be a bad switch in the automatic headlights and try turning it to manual. I did and haven't had a problem now for over a year. Hope this helps your problem.
  • My 2000 Grand Cherokee was also stalling. It would start and then immediately die. Took 3 or 4 times to get it going. Then it would just die while I was driving it. Also, the headlights would start flashing on and off even when it was parked. Took it to the Jeep dealer, they'd never heard of the problem. But the service man said it could be a bad switch in the automatic headlights and try turning the headlights to manual. I did and haven't had a problem with the headlights flashing or the car stalling now for over a year. Warm or cold weather didn't seem to affect it. Hope this helps your problem.
  • Our 96 GCL with the 318 CI was doing the same thing. I called my father who was a Jeep/GM mechanic for 30 some odd years and the ECU was the first thing he said. If your getting zero codes and no fast idle on cold starts the ecu is the culprit. I called an outfit in Florida that operates off of E-bay and ordered a new unit. about 300.00 Shipped over night but the guy had asked what the issue was at first. I asked him instead "what's the most common issue" He said "idle hold failure" BINGO!!!! Most commonly see in ECU's that are 125K to 160K in mileage. Luckily the only wasted money at this time was the TPS I replaced for $50.00. For those with really low idle and constant dying but always restarts, start with a new ECU first. It'll be cheaper in the long run.

    Jason
  • Update to my issue. Got the computer and the jeep wouldn't even run. New computer equals fail. Plug mine in and it runs. Still has the idle issue but at least it runs. Computer is going back and on goes my search for a fix.

    Jason
  • alby3alby3 Posts: 46
    can believe it would not even start.... got mine from the place in florida and it started right up and fixed the problem..... may want to try it again and double check the vin nbr you gave them with the one they programmed in and the part nbr and mileage too.... even if it did not fix it it should have started.... so something is not right there......
    good luck
    alan
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