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Jeep Grand Cherokee Start Stall Idle Problems

589 messages,  Last post on Nov 26, 2009 at 4:03 PM

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#472 of 589 Re: Jeep Grand Cherokee drops RPM's to near 200 when idleing [Alexwastaken] by gcl1 Feb 12, 2009 (10:14 am)
Replying to: Alexwastaken (Feb 12, 2009 8:31 am) My guess is that you have the 4.7L v-8. If so, the dealer may need to reflash the computer. I have had the problem only a couple of times, but the new flash should help it. Replies to this message: Alexwastaken (Feb 12, 2009 11:35 am)
#473 of 589 Re: Jeep Grand Cherokee drops RPM's to near 200 when idleing [gcl1] by Alexwastaken Feb 12, 2009 (11:35 am)
Replying to: gcl1 (Feb 12, 2009 10:14 am) It could be a computer problem? I never thought of that. I just imagined it to be more mechanical than that. Although, I believe that it is a 4.0L strait 6. Its a 1997 Grand Cherokee Laredo.
#474 of 589 Re: Jeep Grand Cherokee drops RPM's to near 200 when idleing [Alexwastaken] by oldbaja Mar 01, 2009 (9:13 am)
Replying to: Alexwastaken (Feb 12, 2009 8:31 am) Read your mesage on the low rpm ans stahling. Did you have the computer flahed by the dealer? Did it fix it ?
#475 of 589 Re: 98 Jeep Grand Cherokee Stalling... [goofyandpooh] by rosebuddove Mar 01, 2009 (12:42 pm)
Replying to: goofyandpooh (Feb 28, 2009 9:50 pm) I posted the other day regarding my 04 stalling and idling very slow/low.   I was trying to avoid going to the garage at all costs. I had told a family friend and he layed awake trying to figure out what was wrong with my Jeep. At 1 am we got a phone call.   I was told to remove the negative battery cable for 30 minutes. I did this and my jeep is running like new. Evidently the computer had to be reset in order for the engine to run properly. I then proceeded in going on a 300 mile round trip and not once was there a hesitation, whereas the night before I was stalling at redlights.   It may sound crazy, but it is true. I don't know if this will help you, but it worked for me.   When I did talk to the garage, the man said he could put it on a testing machine that would be a tell all for what is exactly wrong. That was going to be my next reluctant step.   Another possible idea is the catalytic converter. I had this happen on another car and it acted very similiar to your issue. Since you replaced so many components, there is not much left to try to do.   I have found that the best mechanics are the young backyard mechanics who breathe life into rides that have seen better days.
#476 of 589 Re: 2000 Grand Cherokee Limited 4x4 4.7V8 Stalls [tuggajb] by texgking Mar 02, 2009 (4:07 am)
Replying to: tuggajb (Feb 22, 2009 5:25 pm) An update on the stalls. I replaced the Idle Control Module at the throttle body and cleaned and reseated that module in front of the coolant module (the one with one long bolt) and took it for a test drive. Ran fine for over 15 miles, thought I had it licked. Then after parking with the engine and AC running for about 10 minutes while I returned a book it, I drive about a block and it stalls. After a few minutes go by, it starts right up, goes another block stalls. I opened the hood, took a break and let it cool awhile. After maybe 20 minutes it starts right up and I make it home 10 miles, without stalling.      Now I order the computer, when it arrives, Woops wrong item, this new one has 3 connectors mine only has one. I get a refund then call the dealer with the numbers off this module with one bolt and they tell me that is Not the PCM. The parts person does not have a picture, just comparing part numbers. So back to the jeep.    That module that sits right in front of the coolant tank is Not the PCM. The PCM is up against the fire wall to the rear of the coolant tank. It is attached to a large metal plate and actually sits between that and the firewall, very hard to see. But look closely with a light and you can see It has three connectors plus a ground on the back,just exactly like the one I had ordered and took a refund. With a sheepish grin I return and get that PCM, the one with 3 connectors.   The instructions tell you to ensure all relays are within limits or it may harm the module, so I also get a new Fuel Pump Relay. I think there are three relays with the same part number as the fuel pump relay. I replaced the relay and installed the new PCM. Test drove it over 100 miles, ran file. The next day another 50 ran fine. It's been cold lately so have not tested yet with AC going and long idles, but it appears to be running fine now.   In total I replaced the TPC (36), ICM ($56), PCM ($125)Fuel Pump Relay ($16) and the battery connections plus cleaned lots of grounds. It appears to be fixed, I hope. Thru all of this I never had an engine light go on. Replies to this message: ike21 (Mar 02, 2009 7:59 pm) texgking (Mar 03, 2009 12:41 pm)
#477 of 589 problem with fuel pump on start up only by zs711 Mar 02, 2009 (8:52 am)
I have a 95 JGC, v8, when I try starting it just turns over. Have to wait for fuel pump to kick on,was 1-2 min. suddenly 10-15 mins.Once pump reaches pressure it will start fine and runs perfect. used to restart fine once warm but acts up every time now.Got really bad over night Replies to this message: frumunda (Mar 02, 2009 4:48 pm)
#478 of 589 2004 grand cherokestiil vibrates after new rotors by muff22 Mar 02, 2009 (2:32 pm)
brake pedal pulsed found bad left wheel bearing and put new rotors sti the same thinking abs or cv or front drive shaft please help!!! :
#479 of 589 Re: problem with fuel pump on start up only [zs711] by frumunda Mar 02, 2009 (4:48 pm)
Replying to: zs711 (Mar 02, 2009 8:52 am) Sounds like a bad Idle Air Control motor again. My suggestion is to read all of the posts in this category as it will shed some light on your issues. You may also want to look into your fuel system a bit deeper...when was your last fuel filter change, what your hot/cold fuel pressure is(have a mechanic do this), pressure test the pump, check your injectors, the works.   When you can't start an injected engine when its cold, SOMETHING is not allowing the fuel mixture to either richen up (like when you use the choke on your lawnmower)or actually GET to the cylinders(like plugged injectors, or a blocked fuel filter). Sometimes, a wide open IAC will cause the engine to act this way. Also, if your mass air flow sensor/airspeed sensor is dirty or bad it will take time for the engine to fire up.   Again, just my two cents.
#480 of 589 Re: 2000 Grand Cherokee Limited 4x4 4.7V8 Stalls [texgking] by ike21 Mar 02, 2009 (7:59 pm)
Replying to: texgking (Mar 02, 2009 4:07 am) I keep posting this but none is reading past posts. You are smart to go with Idle air control sensor and the Throttle Position Sensor first since they are the easiest and cheapest to fix. If those do not work then it is 90% always the Camshaft Sensor that is making it stall. I know it sounds weird but that's how they made them 1999 and up. The 99's and up are never the fuel pump. The fuel pump is the only thing they made well on these Jeep GC's. If it keeps stalling change but the Camshaft Sensor. Harder but can be done yourself with a buddy and or small hands. lol Replies to this message: texgking (Mar 03, 2009 12:41 pm)
#481 of 589 Jeep Cherokee by bradpans Mar 02, 2009 (8:05 pm)
I finally solved the problem with stalling on my 1997 Jeep Cherokee Laredo...My mechanic replaced the ignition switch and coil...

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