2004 Jeep Grand Cherokee: misfire or rough idle

Filed Aug 10, 2020 · Electrical, Engine · 182,046 miles · VA

The ECM is malfunctioning causing vehicle to stall and misfire at any speed mainly when accelerating making it hard to keep under control safely.

Filed Nov 19, 2019 · 139,000 miles · SD

The vehicle sometimes doesn't start and sometimes it starts just fine. Sometimes when you put it in drive it will die and sometimes it will run just fine. Sometimes it has a rough idle and will stall and die when driving down the road. And then when you start it back up again it will run just fine and then will stall and die again. We have taken it to the dealership and they replaced the coil pack and it is still doing the same thing. We have checked all of the grounds and there are no codes being displayed.

Filed Jan 24, 2014 · Engine · 80,000 miles · NE

Tl* the contact owns a 2004 jeep grand cherokee. The contact stated that while driving 65 MPH, the vehicle began to misfire. The vehicle was taken to the dealer for inspection where they stated that the cam shaft position sensor needed to be replaced. The vehicle was repaired but the failure recurred. The manufacturer was notified of the failure. The failure mileage was 80,000.

Filed Jan 19, 2008 · Fuel system · 44,000 miles · PA

Several diagnostic codes referred to oxygen sensor problems that caused the check engine light to go on and off on multiple occasions which eventually lead to the vehicle misfiring, which lead to multiple diagnostic codes and loss of power, unburned fuel, and stalling. It was learned that the manufacturer put the wrong oxygen sensor on the vehicle, oxygen sensors were installed with incorrect parts which could cause engine to lose power or stall, increasing the risk of a crash or fire due to unburned fuel from one or more cylinder misfire.

Filed May 9, 2006 · Engine · 17,000 miles · AZ

At 17,000 miles my 2004 jeep grand cherokee laredo freedom v-8 4.7 ho engine developed a rough idle. The dealer cleaned out the fuel injector and the problem did not go away. 2nd time they put it on the computer and couldn't find anything wrong. The #2 piston popped in and out so the mechanics agreed something was wrong and recommended a new engine; but the manager wouldn't do anything. They agree the vehicle runs rough and notice the vehicles on the lot run smooth. They suggested I change the spark plugs which cost me over $200.00 and that did not help. The dealer did change the oil pump and put in 8 new lifters. This still did not take care of the problem. The district manager stated all the jeeps run that way. He and the manager above him both state they will do nothing for me and they are closing the book. I have talked to several jeep owners with the same vehicle. Some have a rough idle and some run very smooth. Other reliable people have told me the problem is the computer. When I told the service manager he said to put the engine in low and it will jump the computer into shape. The idle is getting worse and has affected my gas mileage. I am still under warranty and am getting no where with jeep or chrysler. I now have over 31,000 miles and am nearing the end of my warranty. I don't know what will happen if the computer just dies. I imagine the engine will stop on the road and possibly cause an accident. If you could look into this I would appreciate it. I just want chrysler to stand by their product and come up with a solution so I can be assured of a safe vehicle. Another thing is they never give me paperwork after they've had my car for a few days to check things out. They always tell me it's still open and when everything is finished they'll give me paperwork.

Filed Sep 22, 2005 · Engine · 63,155 miles · WV

I have a 2004 jeep grand cherokee laredo, 4.0 liter, SUV. Since approximately august of this year, the engine has misfired eleven (11) times. Each time there is a misfire, there is an immediate power loss, and loss of speed, almost like an emergency braking situation. One event, on 8/15/05, when traveling on I-66 near fairfax, va two cylinders, nos. 1 and 4 misfired at the same time. The result was an immediate loss of power during acceleration and loss of speed from approximately 65 MPH (rate of traffic at 3 pm rush hour) to approximately 25-30 MPH within 50 yards. This incident nearly caused a serious accident, because other vehicles had to brake and swerve to avoid colliding with mine. There was no where to pull over to the side of the road, and luckily I was able to maintain control and continue at a slower rate of speed, until I could move to the right and stop in the emergency lane. After turning the engine off, the vehicle will run normally when restarted. As previously stated, it has misfired 11 times, and by stopping the engine, then restarting it, normal operating can resume. Chrysler corporation has been unable to repair the defect, after having taken it to the shop on nine or ten different occasions. They have replaced the spark plugs, tested the engine for carbon deposit build-up on the valve stems, and replaced the crankshaft sensor that the computer uses to fire the engine. Now, the manufacturer has said it may be the computer module, it may be the coil pack, or the engine may need to be disassembled to see if there is any carbon build-up on the valve stems. This condition makes the vehicle unsafe to operate, not knowing when it will happen again, and if it will cause a serious accident to occur. Maybe the federal safety agency can light a fire under their creative minds to come up with a positive solution. I have 63,000 miles on the vehicle, and the whole series of incidents began when there was approximately 49,000 miles on it.

Filed Dec 30, 2004 · Electrical · 1,100 miles · SC

We purchased a 2004 jeep grand cherokee the end of june 2004. The car had approximately 30-40 miles at purchase. Three days after purchase the car cut off on my husband and was difficult to start. The dealership told us they could not look at the car because the check engine light did not come on. While on vacation 1 1/2 weeks after purchase our car shut off while traveling 60 MPH on a highway. The car would not start and was towed to a jeep dealership in maryland. That dealership replaced the computer in the car. No incidents occurred for 1 1/2 weeks. Then upon our return to south carolina the RPM of our car would suddenly drop to 500 while idling at traffic lights or at a stop. The RPM's would also suddenly drop to 0 and the car would cut off while idling. From the middle of july until the end of august the car was looked at approximately 6 times. The skim module and wiring harness were both replaced in the car. After the wiring harness was replaced the car ceased to have problems for 3000 miles. Then on december 4th the car cut off while waiting at a traffic light. The RPM's have now started to once again drop down to below 500 and occasionally they go up and down when the car is not even moving. A co-pilot system was installed to record any errors in the car and no codes or misfires were captured from the car. The dealership has been unable to fix the car and chrysler informed us that they were not willing to replace our car even though they are unable to fix the problem.

Filed Jun 1, 2004 · Engine · FL

Purchased 3/04, in for service 5/04 x2 at 1st dealership for rough idle in park and in gear at stop. Diagnostics indicate no problem, rec calling chrysler cust service, referred to 2nd dealership, same complaint, diagnostics indicate no problem. Was told "that is how that engine runs"*ak engine feels as if it will stall out at stop or park. Chrysler offering no help at this time other than referral to district manager which will not be in until end of month.(june) appears that there have been many complaints logged about this, yet chrysler/jeep unwilling to fix problem. Vehicle also pulls to right, was told "that's how it is", also less than ave gas milage.