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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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#466 of 589 Engine stops after idling for a while when warm by Svennypo Feb 28, 2009 (3:26 pm)
< I tried to start my 1993 Jeep Grand Cherokee this morning and it was hard to get it to run. when i pushed on the throttle it felt like it had a short in the electrical circuit , because it stumbled or ran rough for a little bit before it would run smooth . I opend the hood to see if i could see anything unusual. It was idling just fine , then i went to get my volt/ amp meter to check to system. The engine shut off and would not start again. I tried to see if I had power going to the coil but I could not get a reading. I tried to get a reading by cranking the engine over , but no reading / or power to the coil. I have no book or manuel to look at. Is this a pcm problem? How do i check the pcm out?
#467 of 589 98 Jeep Grand Cherokee Stalling... by goofyandpooh Feb 28, 2009 (9:50 pm)
I have a ‘98 Jeep Grand Cherokee, it started stalling out while being driven at least at 30MPH+ or as we come to a slow stop. Took it in to the shop, did a tune-up, examined fuel filter (no prob), replaced TPS (Throttle Position Sensor?), got the car back, drove about 4 miles and it stalled! Drove it back to shop, they kept for add’l 3 days, did not stall on them (of course). They put the old TPS back in since it stalled on a new one thinking the old one was fine. Replaced the Ignition Coil. Just got it back today, drove about 2.5 miles stalled out on us 3x. I revved the engine, in neutral at 3500-4000 RPMs & it still stalled out! It feels like as if the fuel mixture is incorrect when it does about to stall out. I put in neutral, step on the gas & I’m fighting w/it to not stall. In-laws had this similar matter w/their current Jeep about a year ago & replaced every single possible sensor there was & it lasted about a year, they are now having the same issue as us. since they replaced all the sensors, they had no clue what part was really the culprit. Anyone have any suggestions I can pass onto mechanic for my car? Thanks. Replies to this message: rosebuddove (Mar 01, 2009 12:42 pm)
#468 of 589 Re: 1993 Jeep Cherokee Sport stalling after start up [tidester] by sarge836 Mar 01, 2009 (7:42 am)
Replying to: tidester (Feb 27, 2009 4:26 pm) Tidester, thanks for the reply, we worked on it for a few hours yesterday, changed all the relays etc. Checked power going into fuel pump, when you turn on the ignition, we have power on one of the lines and the fuel pump turns on then shuts off in 1-2 seconds power goes out, try to turn over jeep starts then stalls and then the fuel pump turns back on automatically.???? I checked the codes on the engine lite and it is 3555 which I was told and looked up that its the "idle control valve" we haven't changed that because it doesn't make sense it just seems it runs out of fuel. I can pump the gas a little and gets more rpm's but just dies when it runs out of fuel. any other thoughts could the pump be bad? Thanks Jeff Replies to this message: tidester (Mar 01, 2009 10:28 am)
#469 of 589 Re: 1993 Jeep Cherokee Sport stalling after start up [sarge836] by tidester HOST Mar 01, 2009 (10:28 am)
Replying to: sarge836 (Mar 01, 2009 7:42 am) You didn't mention whether your check engine light is coming on. If not, then you can probably rule out electronic controls.   Way back in our archives, people describing similar symptoms thought there might be a problem with the IAC (Intake AIr Control) and valve. You can browse through that discussion here: http://townhall-talk.edmunds.com/direct/view/.ef1b887   tidester, host SUVs and Smart Shopper
#471 of 589 Jeep Grand Cherokee drops RPM's to near 200 when idleing by Alexwastaken Feb 12, 2009 (8:31 am)
When I come to a stop with the car in gear my RPM's go from the normal 800ish down to around 200 or so and then back up. And a handful of times it has died. This only happens when in gear. (Its and automatic btw) And sometimes it stays at the noraml 800 RPMs with no problem. Other than that, the car drives fine. No problems when its in park, or when cruising down the highway. Its been having this problem for about a year now. Anyone have similar problems? Replies to this message: gcl1 (Feb 12, 2009 10:14 am) Alexwastaken (Feb 12, 2009 11:35 am) oldbaja (Mar 01, 2009 9:13 am)
#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.

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