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Jeep Grand Cherokee
Aug 29, 2010 (1:46 pm)
I have a 2000 jeep grand Cherokee 4.7L . I've had a recent tune up dine on it and a week later it started idling rough. Like it was gonna stall. I had a sensor replaced down by the starter a couple monthes before the tune cause ut would stall when you came to a stop, that stopped.. I just replaced idle air control valve and it's still having the same issues. Once it gets warmed up after driving it for a little bit it runs fine. Any ideas on what it might be? Can it be the sensor that I replaced a couple monthes ago down by the starter area?
#752 of 1238 Re: getting aggervated [celticmoon76]
Aug 30, 2010 (4:31 pm)
we have the exact same problem.
what plugs on the firewall?
#753 of 1238 Re: getting aggervated [jjesbk]
Aug 30, 2010 (5:16 pm)
Ok, Had the same stalling intermittently issue/problem but I think I fixed it. Take the plugs off of the PCM near the passenger side at the firewall. I had to remove the overfill tank for the coolant but that was no biggie. Get in there with contact cleaner and clean them, add some di-electric grease to the tips and holes. make sure they are very clean before using the grease. I did the same for the other two connections near the PCM as well. Put it all back together and make sure all the connections are tight! This should work for the stalling intermittently issue. If it doesn't work, I would make sure all the plugs you can see in the engine compartment, including all sensors are cleaned and greased with di-electric grease. this should solve any electrical gremlins you may have.
#754 of 1238 Re: getting aggervated [jjesbk]
Aug 30, 2010 (7:38 pm)
They are referring to the three electrical connectors (plugs) to the ECM (Engine Control Module). The ECM is mounted on the firewall and is kinda behind the engine coolant reservior (but the reservior is mounted on the fender well). ">link title
Disconnect the negative terminal from the battery first.
Unplug the connectors...apply dielectric grease (available for $2.49 from any parts store) to the pins and the connector plugs and reconnect.
#755 of 1238 Re: getting aggervated [jjesbk]
Aug 31, 2010 (7:48 am)
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) THIS MAY ALSO BE THE PROBLEM, IT IS GOING TO SOUND SCREWY BUT THERE ARE TORX SCREWS ON THE 1998 AND EARLIER ECU. BACK THEM OUT ABOUT A THIRD OF A TURN, THE SCREWS ARE TOO LONG AND ARE CAUSING SOME KIND OF SHORT IN THE CONNECTION OR MAYBE THE GROUND.
3) 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 SEEMS TO HAVE FIXED THE PROBLEM..... BEEN A 3 WEEKS.... SO FAR SO GOOD
#756 of 1238 start problem
Sep 03, 2010 (1:13 pm)
hi I have 2000 grand cherokee I left car on a street when I came back alarm was on and syren on. So I switch off alarm close the car and live for 2 hours.When came back I turn the key but car dont whont start my battery is old 5 years but ok After 15 min was dead. Can by the problem I hiered if battery is old and its not inaf power car dont whont star is true?????
#757 of 1238 Re: start problem [mkantor]
Sep 03, 2010 (2:01 pm)
Just buy a battery Forrest 'cause none of us have a clue about what you are saying.
"That's all we have to say about that."
#758 of 1238 Re: start problem [mkantor]
Sep 04, 2010 (5:23 am)
Yes you will indeed need a new battery. Any drop in the battery charge will cause the jeep to not start. Even if it turns over there are other components that will need full voltage to do their job. If you can't afford to buy one you will have to at least fully charge it but it will keep giving you problems.
Sep 06, 2010 (9:01 am)
hi and thank tou for advice I change the battery for new full charge but its not working plus I computer is not showing any problems Any idea???? PLEASE FOR ADVICE THANK YOU
#760 of 1238 jeep not starting
Sep 06, 2010 (12:08 pm)
Hello, I was on here last year reported that i replaced a pcm,fuel pump,throttle position sensor and cleaned distributor it finally ran great for awhile but the people i had put in the used fuel pump didnt connect the sensor for the gas to read whether how much gas was in it so we ran out probably about 6-7 times of gas throughout the year,now i have replaced the fuel pump again and now have gas gage reading 1/2 tank heard the pump come on when cranking over it started right up, took to gas station aired up tires put more gas in left in running for about 40 minutes turned it off started right back up.The next day my daughter took her jeep to work 11-2 came home at 230 and we tried to leave again at 3pm but then wouldnt started i changed batteries out no difference used carb cleaner to help it under hood at air flow almost started then replaced the fuel sensor relay plug no start,i am getting gas at the tester button under hood but now i cant hear the fuel pump turn on when turning key over i've banged on fuel tank no help i ordered a crank shaft sensor it shoudl be here this wk but i cant afford no more my car is broken down now too with smashed winshield and my daughter now has to take 4 buses to and from school at $4 aday..In need of desperate help, i am going to drop the fuel tank one more time today and see if any wires or hoses are kinked and see if that helps, oh i did test the ignition coil and there is spark i will test the spark plugs when i drop the tank too,i dont know what else it can be but it sounds like its not getting any spark is there anything else i can check?I have a 93 jeep grand cherokee 4.0 automatic 4x4