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Jeep Grand Cherokee Start Stall Idle Problems

1068 messages,  Last post on May 01, 2013 at 6:01 AM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee

Messages Page 41 of 108

#395 of 1068 Re: HELP!!! 96 Country won't start [em82678] by bradpans

Nov 04, 2008 (7:36 am)

Replying to: em82678 (Aug 16, 2007 3:06 pm)
My 1997 Jeep Grand Cherokee is experiencing the same problem of stalling. Sometimes I can't start in the morning, stalls in the middle of the road, but after a few minutes of waiting it will start again. I have replaced the fuel pump (there is no fuel filter for 1997-99 outside), crank position sensor replaced spark plugs, clean the ignition system. I read in this forum about the battery,(sometimes it reads 6-8 volts but once started goes back to 12-13. There is no check engine codes. Any other suggestion?

#396 of 1068 Re: HELP!!! 96 Country won't start [bradpans] by tuggajb

Nov 04, 2008 (2:13 pm)

Replying to: bradpans (Nov 04, 2008 7:36 am)
how old is the battery if older than year or two change that first as jeeps dont like voltage varences that well battery is only 75 85 bucks at wall mart then see if prob goes away

#397 of 1068 Re: HELP!!! 96 Country won't start [bradpans] by ike21

Nov 04, 2008 (2:46 pm)

Replying to: bradpans (Nov 04, 2008 7:36 am)
Once again. 90% of the time it's the Throttle Position Sensor. $30 at parts store and 5 minutes to change. If it's not the TPS it's going to be the Idle Air control Sensor, about same price and little longer to change because of placement. I fix Jeeps everyday all day.

#398 of 1068 Re: starting problem [ngharteyk] by fresh121

Nov 04, 2008 (4:55 pm)

Replying to: ngharteyk (Oct 26, 2008 1:54 pm)
I had a problem with my 1999 Grand Cherokee stalling. A new crankshaft position sensor solved the problem. When installed it started with no problem. It is located on top of the bell housing, awkward to get to but if you remove it there may be oil deposits on the end stopping the signal passing through.

#399 of 1068 Re: Hard start in cold weather [barnaby95] by barnaby95

Nov 13, 2008 (8:50 pm)

Replying to: barnaby95 (Oct 12, 2008 3:56 pm)
The '93 is a 4.0. I replaced the battery with no apparent change in the problem. During the starting sequence, in the morning or after sitting for several hours, the check engine light does not come on (trouble light test sequence) for a few minutes. When it does come on, then the fuel pump will start. I don't want to just start replacing parts without some idea of what is causing the problem. Any help anyone can give would be greatly appreciated.

#400 of 1068 Re: Hard start in cold weather [barnaby95] by tuggajb

Nov 13, 2008 (8:58 pm)

Replying to: barnaby95 (Nov 13, 2008 8:50 pm)
try a new ingnition switch sounds as if not making good contact when it gets cool out sets down on stearing coluem by your feet

#402 of 1068 97 grand cherokee no spark / no start by pla4kps

Nov 14, 2008 (12:37 pm)

im having major problems with my 97 cherokee. i dont have spark. so far i have tested and replaced the batt, the coil, the crank sensor, the cam sensor ( aka the sync signal generator inside the distributor ) and have tested power at the coil. i am getting power at the green / orange wire . when i flip the test light to + i am getting ground at the coil but not while cranking. i have tested the wire from the pcm to the coil and it isnt broken or damaged. the truck sat in an impound for 2 1/2 years before i bought it. it took close to an hour to get it jumped and running and even still i had to keep my foot on the gas at all times or it would stall. can the pcm lose its memory?? does it have to be reflashed?? is their anyway to do it myself?? thanks everyone for your help.

#403 of 1068 Re: HELP!!! 96 Country won't start [bradpans] by pla4kps

Nov 14, 2008 (1:50 pm)

Replying to: bradpans (Nov 04, 2008 7:36 am)
I FOUND THIS ONLINE AND IT MAY HELP YOU
 
Found that the outboard PCM cover screw was shorting out the circuit board. Chrysler PCM p/n P56028412, s/n TEH106636023.
 
Short story long: I have a 96 Grand Cherokee 4.0L, 125,000 miles. Several weeks ago, I started to have stalling issues. Hot or cold, dry or wet, first drive of the day or last, it didn’t matter. The engine would cut out. It felt like it lost all electricals.
At the time it was showing an ASD relay code. Swapped the ASD and A/C relays. Same problem. I didn’t have time to look at it, so I had the dealer go through it. After 2 days and $200, they called and said it was the ASD relay, and that they put in a new one, and it’s all good. Um, ok, maybe I missed something. I’m a trusting soul, but let’s see if this fixes it. The next day the problem was back. I went back to the dealer and they basically said, “We don’t know what it could be, good luck with that”. Now my wife knows why I don’t go to the dealer. By the way, the old relay tested good.
My turn. Being the methodical aircraft mechanic that I am, I grabbed a multi-meter, contact cleaner, and wiring diagrams. I cleaned connectors, ohmed out wires and sensors, checked for power and grounds. Everything checked good. By now, it’s showing ASD, crank sensor, and primary ignition codes. Then, with my wife trying to start it, I wiggled the connectors on the PCM. Every time I wiggled the gray C3 connector just right it would run. When I let go, it would die. So I took the connectors apart and tightened up the crimps (I don’t recommend doing this without the proper extractors and crimper). Threw it back together and BAM! Same problem. Well, time to bite the bullet and check for bad solder joints on the PCM board. I took the cover off of the PCM and realized that looking through the potting compound is like looking through Guinness Stout. But, I put it back in and hooked it up. It started stronger than ever, and didn’t even think about stalling. Yes! I figured that I finally got the connectors sorted out, so I left it over night to cool down. Got up the next morning and it started right up and wouldn’t stall even when wiggling the connectors. So I put the cover back on, put the PCM back in, hooked up the connectors, and BAM! It wouldn’t start! That was the point when my wife asked, “How’s it going?” And I, being the methodical aircraft mechanic that I am, said, “what the ----?” That’s when my wife turned around and went back into the house. While smoking a pack of cigarettes, I thought, “Gee, it runs with the cover off, but not with it on.” DUH, wonder what it could be? So I backed out the two screws that hold the cover on and BAM! It started right up. Then, while it was running, I tightened the outboard screw and sure enough, it died. Yes! Aircraft mechanics love it when they can make things stop working. I installed new screws (1/4” long, factory screws are 1/2” long Torx head), and she’s been running great ever since.
Now, will this fix a bad crank sensor or idle air motor? No. But it is an easy trick to try before going to the dealer and having them throw expensive parts at your Jeep and seeing if any of them stick. Just back out the cover screws about 1/8”-1/4” (don’t worry, nothing will fall apart inside). If it fixes it, great! Spread the word. If not, use logical trouble-shooting steps. Learn the systems – what will and what won’t cause the problem. Good luck.
As a side note, if you want to see a service manager’s eyes pop out of his head, tell him that you want your money back because your not going to pay them to trouble-shoot a design defect. It’s a glorious sight.
 
AND IF THIS DOESNT WORK TRY THE CAM SENSOR ( AKA THE IGNITION PICK UP COIL INSIDE THE DISTRIBUTOR AND MAKE SURE YOU HAVE POWER TO THE COIL BY USING A TEST LIGHT. GROUND THE TEST LIGHT AND CHECK THE GREEN / ORANGE WIRE AT THE COIL FOR POWER THEN PUT THE TEST LIGHT ON + AND CHECK THE GRAY / WHITE WIRE FOR GROUND. HOPE IT HELPS

#404 of 1068 Re: Hard start in cold weather [tuggajb] by barnaby95

Nov 15, 2008 (6:02 pm)

Replying to: tuggajb (Nov 13, 2008 8:58 pm)
My message was an update of an earlier post about the same problem. A 93 GC limited does not list the part you recommended. I'm still looking for the source of the problem.

Messages Page 41 of 108

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