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Jeep Cherokee Grand Cherokee Engine and Performance Problems



  • Sounds like your fan clutch may be bad. The main fan (mechanical, belt driven) should be turning whenever the engine is running. Replace that and let me know if that solves your problem and if you have any more questions.
  • today i let the jeep warm up to the point of over heating. (please note that the fan is spinning when the engine is on.) then i turned off the engine and checked the fans resistance. its has very little resistance. i dont think thats normal. Its a temperature based fan, If its cold it should spin freely. if its hot it should have resistance. AM I RIGHT? If so i will replace the clutch fan.
  • tuggajbtuggajb Posts: 646
    your right!!!!!!!!!
  • It could be caused by several things, but the most common problem would be tire balance and alignment. If it's been a while since you've had this done, rotate and balance your tires and have the frontend aligned. Before you do this, make sure that your tires aren't just worn slap out and need to be replaced. If you have good tires on your truck, the earlier mentioned service might take care of your problem. Let me know if this helps.
  • ok. im still overheating. flushed radiator, new thermostat, new fan clutch, new electric fan sensor switch. anyone have any ideas? tell me how it could be the water pump. does anyone know how to check the pumps pressure?

    This is whats happening. It warms up. if its at idle it will gradually overheat. when i drive the temp will suddenly drop below 210 at normal operating tempature. whats going on?
  • I don't have a GC but have had similar issues with a Cherokee , Dakota and Ram PU . It was the Goodyear tires. They just wouldn't ballance. On all I switched to Michelin and the problem was gone. I won't get a vehicle with Goodyears ever again. I am currently looking at a GC Diesel and the dealer is going to switch the tires before I even pick it up. Just a thought.
  • leo01leo01 Posts: 3
    Thanks found the problem a bought a relay from auto zone that was bad took it back and bought one from the dealer. It's been three weeks and it works fine.
  • leo01leo01 Posts: 3
    I have a 2005 jeep grand cherokee and must of the ac and heater control panel is dark. I took it out but everything is enclosed in the panel, can I open it or the panel has to be replaced.thanks for the help
  • Ok I need your help guys, (my husband is no help at all) I have a 94 Jeep Grand Cherokee 6 cylinder. The problem is the jeep won't start plain and simple right? No, the jeep started by taking longer and longer for the fuel pump to kick in, 5 seconds, 15 seconds, 5 minutes, 10 minutes, then nothing. Had a diagno0stic run and we didn't get any error codes, so we replaced the crank shaft position sensor and it started and ran fine for one whole week, then back to the no start buisness, fuel pump is not kicking in...has to be the fuel pump right? $350 later we have a new fuel pump installed and still no start, no pump kicking in, Now I have a jeep in my garage that doesn't move and still no idea what the problem is, IT"S IN GREAT SHAPE!! I would hat eto have to junk it because we can't figure out what's wrong..PLEASE help me :mad:
  • Well I'm an 18 year old girl who knows NOTHING about cars. I have a '99 Jeep Cheeroke Sport that "chugs" on me ocassionally, sometimes stalls entirely. It usually "chugs" within the first few minutes; so before it warms up. It back fires through the intake, sometimes it helps to pump the gas pedal. I have replaced the coil, throttle position sensor, and the mass air flow sensor, and it continues to "chug." I've taken it to a dealer who was utterly clueless about the issue. Dealer wanted to replace all "primary ignition components," but would not guarentee that this would solve the problem and this would be at my expense. When I told them this was unacceptable, they told me to wait until it gets worse i.e. causes an accident!! By the way, this was a FIVE STAR dealer in METRO-DETROIT. Can anyone help? I'm just about on walk mode and cannot be seen in a mini-van :)
  • tidestertidester Posts: 10,059
    There are a lot of possible causes for those problems. How about starting with something really simple - like trying a tankful or two of gasoline from another gas station? This is basically a shot in the dark but I'm wondering whether winter blended gasoline may be affecting your engine's performance. Let us know what happens if you decide to try!

    tidester, host
    SUVs and Smart Shopper
  • 5213252132 Posts: 62
    I personally don't think it has something to do with the ignition system. We had a 1998 Ford Windstar that did the same thing. It turned out that it was the fuel pump. How many miles does the Jeep have? The normal mileage for a fuel pump is about 200,000 miles. By the way, the price to replace the fuel pump is $400.00 :cry: . That's the reason we traded it in for a 2001 Grand Cherokee.
  • sswsmksswsmk Posts: 1
    I have a 99 cherokee classic with a 4.0 and it is having some problems. It does not do it all the time but it sputters and misses really bad. sometimes it just idles really rough. It has only died once and i barely got it to start back. Its throwing about four codes saying O2 sensor too lean and rich, bank one and two. Someone said it was the O2 sensors for sure, but i didnt think that they went out that easily. I also thought it could be a vacuum line, so i checked and didnt find anything wrong, missing line, broke line, etc. Can anyone please help?
  • first thing that comes to mind is a faulty sensor....but my jeep also did the same thing(91 cherokee sport) i tried everything and still no fix.then i bought a brand new radatior and the problem was gone and never had it sence 4 years strong and running great
  • guertinguertin Posts: 39
    Hi everyone.
    I'm new to this forum (I'm most active in the GC SRT8). So, please forgive me if I don't fully understand the general Grand Cherokee. $400 for a fuel pump? I just installed one in my 1979 Olds for $35! It took me about an hour (mostly to clean the gasket area). Perhaps the Jeep is much more difficult to put in?
  • rochon230rochon230 Posts: 3
    I have 2000 JGC with a V8 and 122K miles on it. When you put the jeep in park, and even driving down the road, the engine surges up and down. We have taken this to two repair shops with no relief. Does anyone know what this problem is, and is this a dealer only repair?
  • tuggajbtuggajb Posts: 646
    have you changed the tps yet?
  • rochon230rochon230 Posts: 3
    What is the tps?
  • tuggajbtuggajb Posts: 646
    throttle position sensor sences how hard toy mash the gas sends info to computer to tell it to inject more gas if bad computer sends surges to injectors looking for where throttle is at
  • rochon230rochon230 Posts: 3
    O.K., I am with you so far. Is this something a mechanic can fix, or is this a Jeep dealer only fix. Is this something that is bolt on, or does this need some adjusting?

  • tuggajbtuggajb Posts: 646
    prity much bolt on can get at auto zone or such
  • scooterfxrscooterfxr Posts: 1
    Hi, I have a cherokee with 200k 4.0. it starts and runs great for about 10 miles then it starts to die. If i step on it it pops thru throttle body but will fly. have replaced cap rorot wires coil and fuel filter. tried the banging on tank to check fuel pump that didn't help. check engine light on says 02 sensors but have had others with 02 sensor removed and never drove like this. if it idles or is shut off for a while starts to run great again but only for short trips any ideas thanks
  • hmessingerhmessinger Posts: 3
    awhile back i had a 5th cylinder misfire and advanced auto checked it on their computer confirming the problem. well i had the mechanic install a new coil pack in the cylinder, and even after taht every time i drive uphill it just misses and jumps back and forth. i really want to get my jeep in working order. Does anyone have any suggestions?
  • tuggajbtuggajb Posts: 646
    Do a compresson test to see what compression is sounds as if have bad valve
  • tuggajbtuggajb Posts: 646
    sounds as if you have a bad distrubeter bearing or a vacuem leak caused by a valve that opens when hot
  • slaught1slaught1 Posts: 8
    Sorry it is so long between posts, I gave up for a while.

    Problem is still there but your lucky the mechanic is telling you there are actual engine code. I receive no engine or service codes. The dealership eventually kept it for 2 days and Had "there best guy" looking into it.

    They tested everything, compression, timing, replaced spark plugs, wires, unplugged the mds and never did amount to anything. One thing that seemed to help for a few days though was the they cleared the memory on the some sort of system that attempts to account for the drivers habit. By clearing the memory it lessened the problem for about 2-3 days but picked off where it left off.

    This past weekend I replaced the Crankshaft position sensor, which did not help and I will eventually replace the camshaft position sensor. I really hate to throw parts at it but, I have taken it to two different dealers and nobody can seem to figure it out. I have ext. warranty but what good does that do me when they can't find the problem.

    How about you, did you what was causing your issue?
  • slaught1slaught1 Posts: 8
    Hey Landj68,

    What year and model was your JGC?
  • jgc5jgc5 Posts: 2
    Sorry. One more time: I have a 2001 JGC with 93000 well cared for miles on it.

    The other day I was parking in a parking structure & easing forward into the space, when the throttle opened wide. The jeep jumped forward and crashed into the cement support pillar in front of me before I could do anything. Damage is about $5K.

    This has happened twice before (same conditions..easing forward into a parking space) but the first two times I was able to stop. I couldn't track it down because it didn't happen again. This time was worse. Had I been in either parking space adjacent to me I'm sure I would have bolted through the retaining wall and hit the street below. If someone were in front of me, they'd still be scraping them off the wall. I found all sorts of references to this on the web but the local dealer says they aren't aware of a fix (though they were of the problem). No recalls listed either.

    The only thing I can figure is the throttle position sensor - or the computer - someone is sending the signal to race when I am parking. Anyone know of this??

  • jgj2jgj2 Posts: 3
    I also have a 2001 JGC V8 and for the past 3 weeks the OBDII light (I think thats what its called) has lit up on and off, and the car has stalled about 10 times while at stopped or going very slow. It goes right back on when I start it up again. It has also shaked violently back and forth while accelerating. The manual says it might have something to do with a loose gas cap or bad gas, but it has been through several tanks of gas now and the fuel cap is not loose. I do notice that when I open the gas cap I used to hear air escaping, but I don't anymore.
    So I got an oil change, they check all the fluids, I replaced the air filter, and then had the Auto Zone guy plug in his computer and it said I had 4 issues, all relating to the crank sensor. Just today I bought a $45 crank sensor but haven't had it put in yet.
    If anyone else has had this problem or thinks they know what it is let me know please! thanks
  • Has anyone else had this problem?? Traveling at 65 mph, lightly took my foot off of the accelerator and the car totally shut down, leaving me no control - happened to me 3 times on an 8 hr. drive @ 2 weeks ago (car has 20,000 miles - all service performed by dealer) - immediately brought the car to a dealer & was told that the dealers had received a service bulletin describing this issue, but no recall was going out - I was told it was a malfunction of the on board computer program and I needed to have the program updated and reloaded - once completed should have no further problems - EXCEPT, the same darn thing happened to me yesterday - traveling back home on a major road (@50 mph this time) and same thing occurred twice - slightly took my foot off the gas and the car completely shut down - Does anyone have a copy of the Dealer Bulletin about this? I've reported this to - anyplace else I can go? Just want to get rid of this hunk of junk pronto!!! Thanks for comments!
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