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Jeep Grand Cherokee
#1006 of 1240 Re: 1995 Jeep Grand Cherokee Laredo. Please Help. Tried everything. [swelms]
Jun 17, 2012 (6:44 pm)
Your problem is timing related, either valve or ignition. the giveaway is the backfire. either a valve is not operating properly, or is burned. But the most likely is your ignition. Look to the ECM or whatever the correct name for the computer control unit is... but before you do, Double check your spark plug cables to make sure you arent inducing a cross fire situation...
There IS one other thing to Check! YOUR EXHAUST!!! If it has leaks and is literally drawing air in, and too much O2 reaches the downstream O2 sensor (after the catalytic converter), this type of situation can be triggered....
Jun 22, 2012 (7:39 am)
I have and '02 JGC 4.0. It runs well, have had a myriad of electrical problems, most somewhat easily fixable. Now I am having an issue with it starting. Knock on wood, it has never NOT started, but it sure sounds like it isn't going to pretty often. It honestly sounds like a weak battery or starter to me, but I had my mechanic take a look at the starter and he metered it and said it is drawing exactly what it should for amperage. My alternator is putting out 14.2 volts when running, which is right around where it should be. My battery is a year old, and have had it tested 3 times and all tests come back good.
I am at a loss as to what could be causing her to sound soooo labored when it is turning over. Anyone out there have the same issue, or have any suggestions as to where I should start? Any help would be greatly appreciated...
#1008 of 1240 98 Jeep Grand Cherokee Laredo issues
Jun 28, 2012 (2:10 pm)
I have had my 1998 Jeep Grand Cherokee Laredo ( Strt 6 and 130k miles) for almost 6 months. When I bought it from a small dealership it ran great, had alot of power, very reliable. Then about 6 weeks after i bought it, I was driving to the store, I went to stop at a stop light and it turned off. No big deal I just put it in park and then went on my way. Then it progressivly got worse, shutting off at stop lights, stop in go traffic on the free way. Then it got worse, it got to were I would be driving perfectly fine, cruising 50-65mph no issues and then when applying more gas it would slow down instead of speed up, sometimes I can get it to work through the issue and continue on my way but most times it will slow down until it back fires and then eventually dies. I talked to my friend who is a mechanic he hooked it up to his computer and said the 'ignition coil is bad' so I ordered the stinking coil, we replaced it but alas it didnt work. He ran his computer again and it said the 'ignition coil' then started telling me random sensors were bad. Upon reading other peoples issues and resolutions we decided that perhaps the PCM was bad so we replaced it. My friend did a tune up and noticed that the distributor cap, the spark plugs/ and wires had all been replaced. New PCM said O2 sensors were bad so we replaced them. So new PCM and sensors my Jeep was running great full power restored, not dying, alittle broke from the parts I replaced but other wise happy. Then about two months later its back to the way it was before I replaced the computer. what I need to know is what else could be causing my jeep to act up? Or is there a recall that I am not aware of. I am a single mother who doesnt have a whole lot of money to continue sinking it into a car to make it safe for me and my son. Any advice would be greatly appreciated!
#1009 of 1240 98 jeep grand cherokee 5.9
Jul 07, 2012 (8:37 pm)
I have a 98 GC and at some times when i'm at a light stopped it will idle real low then shut off. Also when im accelarating it will lose power andslow down. I would have to pump the accelarator to bring back to normal. I just put in a new alternator. Any ideas?
#1010 of 1240 Re: 98 jeep grand cherokee 5.9 [gc59]
Jul 08, 2012 (7:54 am)
This sounds similar to the problem I had a year ago. What are the engine codes? If they're P0505-which I had, then it could be one of several problems. Initially that's the idle air control and or idle control valve. But it turned out with my 99 GC 4.8L, it was the PCM. Did a ton of research with two different local jeep mechanics, 2 jeep forums and a jeep guru mechanic. Here's how I got my jeep back on the road and running great. http://townhall-talk.edmunds.com/direct/view/.f0f8b2b/971!keywords=#MSG971
Best of luck!
#1011 of 1240 Re: 1995 Jeep Grand Cherokee Laredo. Please Help. Tried everything. [swelms]
Jul 15, 2012 (8:23 pm)
I have the exact same problem as Swelms. I own a 1998 Jeep Grand Cherokee Laredo and if I have been driving for a long time, the power just dies. The speedometer goes down and the rpm drops from 3000 to 1000. If I give more gas, than the car brakes.
I usually let go of the gaspedal for a few seconds and then I can drive again, but this only resolves the problem for a little bit and eventually I need to give my car a rest for about 20 to 30 minutes and then it is fine again.
I asked a few mechanics and even in a Jeep garage, nobody had ever heard of this problem. So I really hope somebody can give me an idea what the problem is and how to fix it?
Thank you soooo much!!!
#1012 of 1240 grand cherokee wont start
Jul 21, 2012 (10:55 am)
I have an 02 grand cherokee (v8) when driving home i thought i felt a misfire but got home without a continuing problem. when i went to start it the next day it cranked but wouldn't start. the codes that i found ( 7 of them) were po455 ,po171. po174,po442.po158,po161, and po0300 i can relate there discriptions if needed but they are basically evap leak large , o2 sensor 2 on bank 2 heater and high voltage, random misfire and bank 1 and 2 lean. the light of course had come on but it ran great until i felt the misfire. any help on where to start would be greatly appreciated
#1013 of 1240 Re: 1995 Jeep Grand Cherokee Laredo. Please Help. Tried everything. [ellies_rocket]
Jul 23, 2012 (3:28 am)
I would recommend to check up the heated wire sensor in the air intake. The wire sensor is very often dirty by the air deposits - grease dust etc. It makes a signal distortion and possible control problems.
The cleaning is very simple, only be careful not to damage the wire.
#1014 of 1240 Re: grand cherokee wont start [ralka]
Jul 23, 2012 (3:45 am)
by my experience it runs as follows:
- the bank 2 O2 upstream sensor is bad - trouble codes P0158 - P0174. It costs a few bucks only
- the unevitable misfires follow - P0300
- after that goes too much unburned fuel to the charcoal cannister, that cannot to process it - code P0442.
Have the upstream O2 sensor checked and replaced, then deleted the DTCs.
I hope it helps
#1015 of 1240 Re: grand cherokee wont start [danny80]
Jul 23, 2012 (10:25 am)
thanks for the insight, i will replace the o2 sensor first and see where that leads. i will let you know if that works
thanks again for the help