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Jeep Grand Cherokee
#826 of 1240 99 JGC Limited Low Idle
Mar 05, 2011 (1:20 pm)
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.
#827 of 1240 Re: 99 JGC Limited Low Idle [thadrash]
Mar 05, 2011 (2:57 pm)
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
#828 of 1240 Re: 99 JGC Limited Low Idle [thadrash]
Mar 05, 2011 (4:58 pm)
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.
#829 of 1240 Re: 2000 Grand Cherokee Limited ( Update ) [bee007]
Mar 12, 2011 (12:06 pm)
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?
#830 of 1240 Re: 94 Jeep Grand Cherokee 5.2 Starts, Stalls [94grandcher]
Mar 12, 2011 (2:04 pm)
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.
#831 of 1240 1994 jeep wont start..
Mar 18, 2011 (3:16 pm)
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
#832 of 1240 Re: 1994 jeep wont start.. [celticmoon76]
Mar 20, 2011 (4:53 pm)
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
#833 of 1240 2004 Jeep Cherokee stalls
Mar 26, 2011 (5:00 am)
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?
#834 of 1240 1997 Jeep Grand Cherokee, Intermittent Stall
Mar 31, 2011 (1:58 pm)
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.
#835 of 1240 to address your issues
Apr 01, 2011 (12:37 am)
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.