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Jeep Cherokee Grand Cherokee Engine and Performance Problems



  • clouds99clouds99 Posts: 1
    After being parked for 4-6 hrs it will start just fine, but as soon as I hit reverse, & drive out it will die- I have to put it in park and re-start it again. The dealer has kept it for days and tells me it never happened to them, and they cannot determine what it could be. It has also started making a loud "Cracking" noise, when I turn, go in reverse, I am so frustrated... HELP PLEASE.
  • I've called my lawyer and written a letter to Nardelli!
  • jgc5jgc5 Posts: 2
    after my episode with sudden accleration and the concrete wall, I'm in the mode for another vehicle. I went and looked at an 05 GCJ and really like it but am afraid I can't buy another jeep after all I continue to read. It could have ended differently for me with my collision....I don't want to take the chance with my family, or letting one of my family drive.

    a real shame
  • 99jeepgcl99jeepgcl Posts: 1
    Ok this is very strange I have a 4.7 V8 I can start my Jeep it will run perfect for 1 hour to 2 days then it will miss, back fire I let it sit for 3 hours and it will run perfect for about 1/2 to 3/4 of hour perfect then start missing and back firing again If I let it sit over night then it will run perfect 1 hour to 2 days????? I had the timing belts changed which as you know requires removing the whole front clip I'm not exaggerating by much replaced every sensor on the engine, catalytic converter, all of the coil packs, plugs, fuel filter which cost 90 bucks. Has anybody had to deal with this same problem?
  • jgj2jgj2 Posts: 3
    UPDATE: Car is running perfect now for a week. Bought a $45 crank sensor at AutoZone, local garage put it in for $75. No more warning light, no more stalling.
  • colborn1colborn1 Posts: 7
    I recently changed my spark plugs on my 1999 Jeep Grand Cherokee 4x4, 4.7v8. I have started to get a miss at high speeds. Gas mileage has gotten poor. Local mechanic says transfer case. I think bad coil plug. No codes shown when tested twice though. Any ideas?
  • tuggajbtuggajb Posts: 646
    try new set of plugs use the ones that are called for under the hood
  • colborn1colborn1 Posts: 7
    the plugs I put in were called for. Autozone looked them up for me before I purchased them to make sure they were the right ones.
  • I have a 96 Jeep GC Laredo straight 6 with 200K+ miles on it. It was running just fine until recently. When I drive it, the engine will shut down sometimes, if I'm doing less than 40 mph. I'll flip the ignition off and on a few times without engaging the engine and it will start up again. Sometimes I have to wait a few minutes, but it always restarts. We have replaced the coil, wires and plugs. Also replaced the auto-shut down and fuel pump relays. Still have the problem. But it only stalls on me! :cry: Last Friday, it stalled 3 times within a few miles of my house. I was able to drive it back home and drove my car to work. My husband drove it Friday, and all weekend with no issues what so ever. I tried to drive it to work today, and it won't even start! All the accessories came on so the battery had juice. My husband checked later and it started fine for him. :mad:

    Any suggestions will be greatly appreciated. Despite the problem, I really like my Jeep and I'd like to continue driving it!
  • tuggajbtuggajb Posts: 646
    i think that you use ac plugs the number is rc12mccy gap at .040 i was informed that you should not use any other type plug as tge computer uses the resistanct in the plug to help set timing etc so stay with orignal eq on mine and have 185000 miles and n o prob
  • tuggajbtuggajb Posts: 646
    have you replaced the ingnetion switch?
    do you have a lot of keys on your key ring? if so remove all but the jeep key and see if that don't take care of prob
  • I had the same problem and it drove me and the mechanic crazy. Most likely it's the the crankshaft position sensor. About $140 P & L and it's fixed. Good luck.
  • colborn1colborn1 Posts: 7
    I put bosch plugs in. The ones it called for at autozone. I was told bosch was best you could get. Thats why I went with them. Should I change back to the ones you advised? Would it straighten the problem out possibly? Or did I mess up the timing?
  • tuggajbtuggajb Posts: 646
    bosch plugs are realy good plugs BUT the computer in the jeep with the 4.7 dosen't like them as it uses the resistance in the plug voltage to set timing and as the timing is set by the computer and can also be diffrent for each plug i would put in oem plugs and see if takes care of prob.

    you can not change the timing just by changing plugs as it is all controled by crank senser and cam sensers

    and the computer
  • xscoutxscout Posts: 141
    I'm open to any ideas. I have a 1997 JGC 2wd 4.0 L6. It always runs smooth except for when it suddenly stalls. It gives no warning it is about to stall such as stumbling or running rough. I am getting no warning lights on the dash and so far it has only happened when the car is stopped at a stop light or pulling into a parking spot. I did change the plugs (Bosch) and the cap and rotor three weeks ago as part of routine maintenance but encountered no problems right after doing that.
  • colborn1colborn1 Posts: 7
    Thanks alot. I took your advice and changed them to the oem plugs. I also disconnected the positive wire to battery for about 10 minutes to possibly reset the computer. I appreciate your help. Could it take a little bit for the computer to re-recognize the change? Should change be immediate?
  • I have a 94 Cherokee, inline 6, 4.0 liter, Manual Tran.....Great engine..310K and still going.

    My jeep was parked by my brother because he said it overheated, I lifted the hood and saw a heater hose disconnection. I fixed the problem and turn the the jeep on. I notice no coolant was being sucked from the overflow tank so I thought it was good to go and did not loose any fluid. Tried driving home, Big Mistake. First I heard a clicking noise from the engine coming and going, I was in 4th gear and notice I couldn't increase speed or decrease speed, when I pushed the clutch down, the RPMs raced to about 5K. I took the next exit and came to a stop by pushing the clutch down and letting my RPMs just race at 5K, dropped it into 2nd and managed my way to the closes gas station. I rolled in and right as is stopped all hell broke loose and white smoak or steam went everywhere. The first thing that came to mine, was that the Head Gasket Blew. I found out later that one of the main hose connection from the radiator completly broke off and I had no coolant The overflow tank didn't work because I'm guessing the radiator could not hold pressure. I replace the radiator and I'm about the go after the Head Gasket and all other related parts...Can someone give me some advise, before I do all that work for nothing..and explain why my RPMs wouldn't go down...Could it be from a Vacuum leak.
  • tuggajbtuggajb Posts: 646
    computer learns your driving habits takes bout week depending on your driving amount
  • I have a 1999 Jeep Grand Cherokee 4x4, 4.7v8. I have started to get a miss while driving on inclines at a speed of 60mph and up. Gas mileage has gotten poor.2 mechanics have put on an engine diagnostic check and found no codes. One mechanic was at a local dodge dealership. Took it for a test ride, with computer hooked up, felt and observed the miss fire and still has no clue what it is because of no codes. Told me I was better of if it quit all together, then they would have a better idea. I cant afford to wait til that happens. Can anyone help? I dont know what else to do. Dont want to cause more damage to the engine.
  • tuggajbtuggajb Posts: 646
    how many miles on your jeep?

    if it were me i would change the oxy sencers on the exaust and see if that helps as they ware out and if still in pramaters of computer will add gas as if running lean when your not thus over fueling engine under load prob have two one in front of cat converter and one behind change them both
  • I have 160000 miles on it. If the o2 sensor is going out would it show up on the diagnostic check? I will give it a try. I am sure they do need changed. I appreciate the advice!!!
  • tuggajbtuggajb Posts: 646
    wouldnt show up as long as it is in fac spect bur could be on the edge of bad with 160000 miles has had to work like h ll so could be worn out as stated i shoes to much oxigen in exaust tikink engine is running lean adds more gas
  • I own a 2006 Grand Cherokee Limited with 15000 kms, I had it for the last 8 month (very impressive vehicle), in the last couple of month in two separate occasions when driving below 5kms the engine suddenly went off, I only get the hand brake light on, immediately turn the key on and the engine starts as if nothing had happened.
    Has anyone got a suggestion?
  • something important that I must mentioned is that this problem only happened when I was about to pull over, once happened at the traffic lights and another time at the car park.
  • I had a miss at 60mph and up with my 1999 grand cherokee as well. Not 02 sensor that fixed it. Took it to Jeep Dealer and they did not know, finally a transmission shop figured it out. It was bad tires causing the transfer case to shift in and out of four wheel drive. Replaced tires and the problem went away.
  • Did you change the wires as well? I would replace them . During the change you may have developed a crack in one which arcs at high speed...
  • jilld73jilld73 Posts: 2
    I'm wondering if anyone can provide a picture, diagram or description of the TPS location on a Jeep Grand Cherokee? Is this part easy to install? Any words of wisdom would be appreciated.

    I'm trying to fix this check engine light on a tight budget and this is what the code Auto Zone pulled for me pointed to. :confuse:
  • Over the last 3-4 days, my 1993 Jeep Grand Cherokee Laredo has gradually increased in intermitten loss of power. I notice that when it has not been driven for 10-12 hours it runs fine for 20-30 minutes. But if I turn it off, I notice a stumbling at start, shakes, low RPMs and little power. It will slowly pick up power, but if I increase gas pedal to quickly, it looses power and may eventually come to a stop. It continues to run, but at very low RPMs and stumbling. As I begin to pickup speed, it occasionally gives small backfires in rapid succession. if I increase the gas too much. I have changed fuel filter, plugs, wires, distributor cap and rotor. I have put half a tank of gas in from several different stations, thinking it was water in the gas. Help!?!
  • I have individual spark plug coils. So no wires to change. I have replaced four of the eight coil plugs and no change. Sounds different when it starts. All started when plugs were changed. I am at a loss.
  • This exact thing has happened to me about 6 times. I'm looking for an answer too...if you happen to find out anything about what it is, or what the fix is please email me at I have the Hemi if that matters?
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