Last post on Dec 05, 2013 at 11:11 AM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee
#972 of 1239 Re: Grand Cherokee- Idle issue [kramer842]
Feb 06, 2012 (11:58 am)
I spent $230 ($45 overnight shipping) and got a new PCM for my 1999 Jeep Grand Cherokee (WJ). My mechanic installed it in 30 mins with a full scan and diagnostics to make sure it was running properly. It's been 3 months and the car runs great. Even gained a few miles in gas mileage. I bought from Auto Computer Resources: (http://store.allcomputerresources.com/jeep.html) and they offer lifetime warranties on their rebuilt/remanufactured PCMs when you send in the old PCM. Buy on eBay and save another $20.
IMPORTANT: Make sure you include, make, model, year, odometer reading, vin number, old PCM model number and description of your problem. They'll custom program the new PCM to all of the above--as well as confirm whether you need a new PCM based on your problem. Be as detailed as possible with info from your mechanic. They're in a tough position because they can only send you a good PCM but if that's not really your problem, then a new PCM won't help. I thought this was pretty cool of them. I guess they've had their fair share of customer whose problems weren't PCM related.
WARNING: Don't confuse ACR with Auto Computer Exchange (http://autocomputerexchange.net/). These guys get a lot of returns and only offer 1 year warranty. And I found one too many complaints about them.
Lastly, I read on a few of the forums that Mopar does NOT offer new PCMs for older Jeeps. They actually buy rebuilds from these 3rd party companies, diagnose, package up and ship them off to Jeep certified repair shops and service shops who then charge an arm and leg to program and install. Another interesting tidbit, a lot of the these companies are in the south eastern states (FL, LA, TX). Due to hurricane katrina and other natural disasters hundreds of thousands of cars were trashed--including their PCMs. Hope this helps.
#973 of 1239 Re: 2000 Grand Cherokee Limited 4x4 4.7V8 Stalls [texgking]
Feb 06, 2012 (8:06 pm)
I know its been awhile since you last posted on this matter. Did the replacing of the camshaft sensor help your problem of your Jeep? I am having the same problem with the '99 jeep GCL. I have had the crankshaft sensor replaced but still does "the stalling while driving" thing. Please, let me know if this help and where was the camshaft sensor located?
#974 of 1239 start an stall problems
Feb 09, 2012 (12:10 pm)
I have owned a jeep GCL for 7 years. I have had few problems with it and love it. When it started to act up, it surprised me what was going on becaue it was always verry dependable.
About 4-5 years ago I had the first problem.
When i started the jeep and put it in to gear and started to go it would die. it acted like i turned off the key, just died. Then it got hard to even start. That problem was the crank timing sensor. It is located at 10:00 position on bell housing (From under the vechile) . To get to it takes long arms and small hands. Oh and a lot of extenions and knuckle on a ratchet. Replaced with a new one from parts store for $70.00.
Then for the last few months the big one happened.
Ill try to explain in as much detail as i can.
My girl friend usally drives the jeep, so some times the problems are not always the easyest to figure out when she has no mechanical back ground at all.
She kept telling me that the jeep woul die on her and couln't explain what happened when it did. I would show up and it would run fine. Then about a week a go i was driving and it happened to me.
I was driving down the road at 45mph and it lost power, it was still running, but if ya gave gas nothing. It had dropped about 1000rpm and stayed there for a few seconds ( 5-6 seconds) then it was fine for about 30 seconds, then again lost 1000 rpm and it back fireded and started going again. I drove about 2 mile down the road then it died at the stop light. It started back up and ran with the occational dieing along the way. No check engine light or any thing. Then about 2 days ago it died when my girl friend was making a turn and she almost hit the car that was going to turn on to the road she came off of because she lost power steering.
At this point I really had to do something about it. So i was reading the posts here and everyone had the symptoms and no answers.
I found a youtube vidieo (http://www.youtube.com/watch?v=uY62r-rtvls). Now im not really one to do this but i figured that since I had done all the trouble shooting in the hanes manual, and noticed that when it died and would not start i could still smell fuel, that the problem was electrical. Now mine did not have the loose connections just pulling it apart and puting it back together, The problem has seemed to dissapeared.
I would like to note that if you do deside to pull the pcm apart, that what you are prying on is a pc board so be carefull not to break it. And you have to pull the jell apart, when you are prying on it so it is kinda hard to get apart.
I will post again in a week and let you know if i have any other problems with it.
Take care and good luck with your trouble shooting!
#975 of 1239 Re: 2000 Grand Cherokee Limited 4x4 4.7V8 Stalls [rgjrtxf250]
Feb 09, 2012 (12:04 pm)
The cam shaft sensor on my 96 is under the secondary pickup in the distribitor.
#976 of 1239 Re: 97 Jeep Grand Cherokee TSI [beckett2006cj]
Feb 13, 2012 (7:01 pm)
i read on another forum, and did this fix for my 96 grand cherokee 4.0. jeep would stall randomly. the pcm for the jeep is located in the engine compartment on the passenger side firewall, behind the coolant bottle. there should be 3 harnesses going into it. while the jeep is running, wiggle those wires. if it stalls, then remove the collant bottle, 3- 10mm nuts. disconnect the negative battery cable. remove the 3 harnesses. you'll see 2 small screws there. they are torx head #15. replace these 1/2" screws with 1/4" #6 sheet metal screw. i used 3/8" with a washer (i couldnt find 1/4"). replace everything in reverse. start the jeep and try to wiggle the harnesses while it's running again., it shouldnt stall. mine didnt and has been good since i did this.
#977 of 1239 Re: Stalling Fixes 98 Jeep Grand Cherokee Laredo, wiring harness question? [mkedigo]
Feb 17, 2012 (1:53 am)
I really don't want do do smart alec, but I bought a scan tool recently and it was a very useful bargain. It not only shows the troublecodes (you didn't have any), it shows you also the operation and sensor data. What's wery important, it can also show the oxygen sensor condition (current amplitude), so you can find out, if it's to be replaced (worn out) ot not.
I have the same problem with the instrument cluster light, I removed the dimmer switch module from the dashboard and cleaned the pod contacts. No problems anymore.
I hope it will help you.
#978 of 1239 01 Grand Cherokee tough start and no idle when cold
Feb 17, 2012 (10:48 am)
I have a 01 grand cherokee with a 4.0. Just this week, with temps in the 20s, it did not start with just a turn of the key. It took several seconds of cranking and pumping the gas pedal to start. Once started I released the pedal and the jeep died... there was nothing. I started it again and this time kept the accelerator pressed down to keep the rpms above a grand. The vehicle will stay running at that point. If i release the accelerator it dies again. Only keeping the rpms above 1k will keep it running. When the engine warms up things start to improve. As it gets warmer it will start to idle in its own for a few min, but rough, and then finally when the engine is warm the engine will start right up with no resistance and the idle will be smooth and the jeep will drive fine. It is now in the 40s and am still having the same problem with the jeep, so its not extreme cold only, just cold. I have read lots of post and it seems like there are 50 things this could be. I'm guessing IAC and coolant temp sensor may be the culprits but don't want to dump tons of money into it if it is maybe something else. I know I am going to have to probable replace a few things before the problem is pinpointed, but just would like to know the best sequence to do try repairs. Thank you for any help. I can provide any more information about this problem that is needed to help get this fixed.
#979 of 1239 Re: 1995 Jeep Grand Cherokee Laredo. Please Help. Tried everything. [duffy2514]
Feb 19, 2012 (5:51 pm)
I have a 94 limited which was doing the same thing. Nothing like getting stranded in Death Valley... Anyway, as you, I replaced the coil umpteen times a year, for about two years. I finally found a mechanic who found the problem was the crankshaft sensor. I recommend that if you replace this, don't go aftermarket; they don't work too well. I hope this solves your problem(s).
#980 of 1239 Re: 01 Grand Cherokee tough start and no idle when cold [rickromero]
Feb 19, 2012 (7:21 pm)
The key to confirming the source of the problem of no start when cold is to carefully observe whether the fuel pump starts immediately when turning the key to ignition position(Not cranking). In a normal situation, the fuel pump should run for at least 3 seconds when key is set to ignition. This way, by the time your engine cranks, fuel is present. In a very quiet environment, turn the key to ignition and carefully listen for the fuel pump to operate. You should hear it right away. If you leave the key in ignition and notice it takes anywhere from 3-10 seconds for the fuel pump to activate, the problem is within the PCM(Powertrain Control Module). There is acually a very inexpensive solution to repairing it yourself as well instead of buying refurbished for $200.00. Additional symptoms related to this issue are random engine stalls that start right up, and transmission slip in cold weather
#981 of 1239 Is it really the alternator????
Feb 24, 2012 (11:16 pm)
1999 Jeep Grand Cherokee Limited. About a month ago, I was driving and the gauge lights all came on, lights got dim, meter with battery symbol went to 9 and it died. Got out tightened negative cable and jumped it. It ran a month with battery gauge at 14. 3 nights ago same thing. Moved cables and jumped it, and made it home. got in last night, and battery meter gauge was at about 12, went about a mile and it was draining fast...went to 9. tried to jump, wouldn't start. today put new battery cable ends on, jumped it. It went to 14 on gauge, then 12, back to 14. Took to shop, he put it on machine. His machine read 12 and he said it was alternator. When he backed it out of the shop, mechanic was surprised it went back to 14 at the gauge. He wants us to have alternator rebuilt Monday and bring it to him to install. I can't afford to fix what may not be the issue. Does this sound like the problem to you????