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Jeep Grand Cherokee Start Stall Idle Problems

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  • I did get fuel discharge from Schraeder valve when depressed. Seemed pretty continuous - I'm not sure if system was just pushing out pressure or if fuel pump was driving it.
  • thadrashthadrash Posts: 1
    edited March 2011
    I hope I'm posting in the correct place, so please forgive me if I didn't.

    I have a 1999 Jeep Grand Cherokee Limited 4.7 V8 with 84,000 miles. We bought it for our daughter's first vehicle and now we are afraid to let her drive it. This is what it is doing: In park it will idle around 6,000rpms. Once you put it in drive and stop at a stop light it drops down to between 3,000 and 4,000rpms (or should that read 600 down to 300-400rpms?). It will randomly jump higher or lower once in a while and has died on me at a stop light twice in the nine months we've owned it. It seems like it is running a bit rough as well. We cleaned the throttle body and it did nothing. We put in all new plugs and cleaned the battery cables. Still running the same. It is not showing any kind of code. Looked for a vacuum leak but couldn't find any, but it could have been missed. When it died on me the first time, it did start right back up and the next day we took it in to a Jeep dealership. All they did was give it a quick test drive and charge us $80 to hook it up to their diagnostic unit only to tell us it was fine. It's not. Could it be a map sensor or TPS sensor?

    I have no clue if this has any link to the above issue, but the transmission often shifts hard. We added some Lucas Transmission fix and it seemed to help for a week or so but is now shifting hard at times again. And every once in a while when I get up to about 50mph, I swear it feels like it is going to stall for just a second--a quick sputter and that's it. It doesn't do that everytime I drive it but just once in a while. Can't quite figure out where to continue on with this vehicle and we want to fix it before our daughter takes over driving it. Thanks for any help offered.
  • alby3alby3 Posts: 46
    about the stalling. i had this same problem. cleaned the throttle body, changed out a few sensors like the throttle positon sensor, map sensor, but what fixed it was changing the pcu or ecu (power or engine control unit) passenger side fire wall behid the radiator resevoir. got it of ebay for $185. sent them my vin nbr., part, nbr, and mileage which they programed into the new one. very easy to repplace. pull resevoir, unplug 3 terminals and unscrew abotu 4 screws. swap it out and it fired right up and did not stall again. i really think this is your problem, mine stalled at stop signs and would hesitate just a second at high speeds on the expressway like it missed a beat or hesitated for a second.
    had the hard changing of gears as well . there are two sensors on the side of the transmission. an input and output sensor. replaced those and that problem went away too, do not remember the price from the parts store ..... good luck
  • dana70dana70 Posts: 7
    I have 1997 GC jeep. In 1 year have replaced many parts, from catalytic converters (2) to crank shaft sensors and all helped but nothing stops the stalling like non ethanol fuel. Walmart/Murphy gas sends my jeep into a tizzy.
    You can try running all the gas out as low as you can and add lucas gas treatment or whatever you prefer and fill it up with non ethanol fuel. It's working for me.
    1 tank sent me into a $1500 parts run (mechanic in the family). Every time I fill up at Walmart or Sam's it starts all over with missing, stalling, dying.
    The best way to get it going when it starts sputtering is to throw it in neutral, pump the gas and start turning it over and let it blow out whatever is throwing it off and continue on.
    Good Luck
    Dana
  • drbe4tdrbe4t Posts: 1
    edited March 2011
    I have had the same symptoms! However, I've changed the TPS on the my jeep(1999) The gauges don't start. It'll start but after... I'd say 9 or so seconds it'll just die. Do you think it's the PCM?
  • 94grandcher94grandcher Posts: 3
    edited March 2011
    At key on, fuel pump runs.

    System pressurizes to about 30 lbs.

    At key start, car starts and then stalls quickly.

    Pressure remains strong.

    Car will continue to run if gas added at throttle body.
  • Hello once again im having problems with my jeep before it was idle then shutting off or acting funny i replaced all filters and pumps finally 3 months ago i replaced the Brain, now today i went to start it it started just fine.. but when i went to move it again it wouldnt start when i put the key in the ignition my lights come on and the door chimes but when i go to turn it over i get nada not even a click,, the battery is new please help if you can thanks so much
  • alby3alby3 Posts: 46
    start with basics... clean terminals and hook up jumber cables..... new batteries go dead too if drained.... weak battery will still ring bells and run the lights
    good luck
    alan
  • A few weeks ago my cherokee stalled and wouldn't start. I have replaced the crankshaft position switch and the camshaft position switch. Ran it for a few days, no problem, (~124 miles). Yesterday after running around all afternoon it stalled while pulling into a parking lot. It re-started but when trying to pull out of the parking lot it stalled again. Could move it around the parking lot slowly to position it for the tow truck. No codes, no gauge fluctuation just stalls with no warning. Any ideas on what I should check next?
  • awhymsawhyms Posts: 3
    edited March 2011
    Just wondering if anyone has had a problem with their Jeep like this:

    Wife drove to AZ and Jeep wouldn't start. Took it to a mechanic who brought up a bunch of codes (catalytic converter, misfire, etc). Changed plugs & spark plug wires and changed the catalytic converter along with fuel sensors & PCV valves when she got back to California.

    Starting stalling 2 weeks later from time to time when she stopped at red lights. Check engine light comes on and codes say several misfires are occurring. One mechanic says it may be the wire harness on top of the engine... Huh????

    Now it seems to be stalling every other day...

    Been spending lots on this vehicle. Love this Jeep and could use a bit of advice to keep it from the junk pile.

    Thanks! :shades:
  • duffy2514duffy2514 Posts: 10
    the mechanic probably hit on some issues that could use repair but the crank position sensor is what i would have checked first. you can check the voltage at the connecter. also my ignition coil was coming and going.
  • dana_bdana_b Posts: 1
    Try a fuel treatment in your gas tank. It's cheap and a quick check. I've been through the same thing with my jeep. A Lucas fuel treatment does as much good as changing out $500 worth of parts. Jeep should do something about this but they won't. SeaFoam worked great too. I have to put a treatment in my tank every 2 or 3 fill-ups. It keeps me going and is improving the gas mileage. If the mechanics were paying for the parts they wouldn't be so quick to say I"m pretty sure you need a..... well you probably also need a ....... it's a never ending cycle with a jeep and a mechanic.

    Thanks,
    Dana
  • awhymsawhyms Posts: 3
    Thanks, truck was towed in last night... Worth a try!
  • awhymsawhyms Posts: 3
    Never tried Lucas before... What does it do?
  • nitro850nitro850 Posts: 1
    please let me know what the problem was. experiencing same probs.
  • alby3alby3 Posts: 46
    about the stalling. i had this same problem. cleaned the throttle body, changed out a few sensors like the throttle positon sensor, map sensor, but what fixed it was changing the pcu or ecu (power or engine control unit) passenger side fire wall behind the radiator resevoir. got it of ebay for $185. sent them my vin nbr., part, nbr, and mileage which they programed into the new one. very easy to repplace. pull resevoir, unplug 3 terminals and unscrew about 4 screws. swap it out and it fired right up and did not stall again. mine stalled at stop signs and would hesitate just a second at high speeds on the expressway like it missed a beat or hesitated for a second.
    ..... good luck
  • lilacloulilaclou Posts: 2
    Own/drive a 94 GJC w/V8, 5.7 liter engine, w/120k miles. Fuel pump died. Had it replaced, along with the external fuel filter. Also had the throttle body plate and intake injection system cleaned. Since that work was done (but never before), it sounds as if it is 'missing', esp. at idle. Idle RPM is 1k or under. Not shaking/not loud but does make a rather funky sound (not sure how to describe). Any thoughts on why this work would cause this reaction? The mechanic thinks that the computer sometimes takes some time to adjust or reprogram and that (me) driving it is the best way to help it along. I am concerned and want to be prepared. Advice?
  • lilacloulilaclou Posts: 2
    For 94grandcher: I just replaced the Fuel Pump and External Filter in my 94 JGC because of similar symptoms. I was able to diagnose my fuel pump issue by reaching under the fuel tank and gently thumping the bottom center of the tank with a rubber mallet. The Fuel Pump is housed inside the the tank so tapping on the tank helps to unstick the points in the Pump. My Jeep started after this crafty maneuver (and continued to run). Then, got it to my mechanic who replaced the necessary parts. Best wishes.
  • WENT TO START IT ONE MORNING (NIGHT BEFORE RUNNING FINE WITH NO PROBLEMS) AND IT ACTED AND SOUNDED LIKE IT WAS GOING TO START BUT IT WOULDN'T FULLY START. EVERYTHING "SOUNDS" LIKE IT IS GOING TO START, JUST WILL NOT TURN OVER.
    TO ME.. HERE IS THE KEY THING *** NONE OF THE GAUGES WILL MOVE WHEN THE KEY IS TURNED ON *** THE LIGHTS, RADIO, EVERYTHING ELSE LOOKS AND SOUNDS FINE. (HAD 3/4 TANK OF GAS WHEN I PARKED IT THE NIGHT BEFORE) I CHECKED THE FUSES AND THEY SEEMED FINE, UNHOOKED THE BATTERY AND HOOKED IT BACK UP AND STILL THE SAMETHING. I AM AT A LOSS. PLEASE HELP. IF I LEFT ANYTHING OUT PLEASE ASK!
    THANKS
  • ornumornum Posts: 5
    I would look into replacing the ECM (Engine Control Module). Look on E-bay for one. Locate on the passenger side on the firewall.
  • I have been having problems with my oil pressure gauge pretty much since I got it about 8 months ago. It is normal when I first start my jeep but as soon as I drive a little bit it drops down to nothing & my check gauges light comes on. It has gotten worse recently so I changed the oil. No better. It's not stalling or anything like that the pressure just bothers me & I have no idea what it could be. I also am having problems with it hesitating to pull out once I am stopped. Any ideas or suggestions??
  • alby3alby3 Posts: 46
    very likely your oil sending unit... just replaced mine, it would go to nothing or just float around sometimes. on my 2000 gc it was located just above the oil filter. about $42 at autozone....very easy to replace.. just unplug the wire lead and unscrew. replace new one.. but do not overtighten...... count how many turns to take it off... and use that many to put it back on... good luck... alan
  • I HAVE HAD NO PROBLEMS WITH MY JEEP BUT THE OTHER DAY THE AC QUIT WORKING AND I WOULD LIKE TO KNOW IF THEIR IS A GOOD PLACE TO START LOOKING FOR LEAKS.I HAVE GOT A CAN OF SUVA LEAK DETECTOR TO PUT IN SYSTEM.I HAVE HEARD THAT THIS MODEL YEAR IS NOTED FOR HAVING LEAKS UNDER DASH.IS THIS SO? THANK YOU.
  • savahna20savahna20 Posts: 1
    I have a 2001 Jeep Grand Cherokee Laredo that the tranny went out on. I replaced the transmisson, put the transmission fluid in it and went to fire it up for a test drive. Backed out of the drive way and didnt make it 25 feet before it stalled out. Thought it was a battery issue so i went and got a new battery, installed it and started it up again. It now makes a slight ticking noise and than it acts like its gonna stall and then picked back up, does this about 6-10 times and then stalls out all together. What do I do. I am past the breaking point with this vehicle. I have been without it for 4 months, decided to fix it myself to save myself the money and it ended up costing me more than it would have cost to have the shop change it. HELP before I get a shotgun and start taking aim!
  • ize2004ize2004 Posts: 1
    I just had to same problem on July 3rd. Driving down on a main street and as soon as I stopped, died. Turned it on. Nothing. Did it again. Still nothing. Police showed up, said 'whats going on?' I said 'when you find out, let me know". Well, the problem that we found was that the timing chain needed to be replaced. The teeth of the chain were so worn out, it cound't do its job telling the engine to start up. They are very inexpensive. My quote @ Autozone was for $46 and some change. The problem is the labor. That will cost you total with labor $800+. Just they have to take apart so many things that are in the way just to get to the belt. Yikes. This may or may not be a problem your having, but its best to check it out. Unfortunatly we only had the Jeep for four months and already putting just about the same amount we put down for a down payment. Hope this helps or leads you in the right direction.
  • kveliekvelie Posts: 1
    My 2000 GC limited 4.7 is driving me crazy. The engine light came on so I had it checked and it came back the iac (idle air control) was bad. Thats when it started idling high, about 1000-1200 rpms most of the time. I've replaced the iac twice. I've replaced the tps. We've checked for vaccum leaks, we've cleaned the throttle body and it still idles as high as 1700 rpms and I'm just about at my wits end. Btw, most of the work has been done by an ASE certified mechanic and I think he's about at his wits end too. Any help would be greatly appreciated.
  • i was taking my sister to work when i heard a back fire, then looked at my guages on my rpms and mph. the mph were hoping up and down while i kept steping on the gas trying to keep the car alive. but it kept chocking and backfireing. i noticed that when my car cools off the car starts but after a while it will just turn off.

    please tell me do you think its the fuel pump or electrical?
  • I have a 1997...very same issues. It started idling at above 1500 rpm, with normal idle speed at about 800. We got a code to replace the TPS so we did that. It ran for half a day and the rpm started swinging while driving it. After a few more days, the check engine light came on. We got an Idle Air Control Valve code so we replaced it. It ran ok for a few hours, then the rpm starting swinging again. There are no codes now, just a constant swinging of the rpms. When I am driving it and the rpm swings, the transmission shifts hard, both high and low. It is as if the car doesn't know how fast it is going and the fuel/air metering is all out of whack. We have had other electrical problems in the past year. Could the ECM have lost its mind? Can the ECM be reprogrammed as a check on the system? Any thoughts would be appreciated. I've carried it to 2 certified mechanic shops and they are both completely stumped as to what to do next.
  • bhunleybhunley Posts: 3
    Get your crank shaft sensor replaced. I had these same issues, i could drive it for a little while and as soon as it warmed up it started shutting off on me. It got to the point where it wouldnt even start until 30 mins later when it started to cool down. After 5 trips to the mechanic and 2 tows we finally got it. Hope this helps everyone
  • cskicski West Springfield, VAPosts: 1,193
    There are 4 Oxygen Sensors on the 4.7. Replace themand ur idle probs will go away. A
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