Jeep Grand Cherokee Problem Report
Jeep Grand Cherokee Check Engine Light due to cylinder #3 misfire
A Check Engine Light may illuminate indicating a "Cylinder #3 Misfire." This normally occurs in hot weather after the vehicle has been driven, parked for ten to twenty minutes, and then restarted. Heat from the exhaust vaporizes fuel inside the #3 fuel injector and causes the misfire. Installing an insulator sleeve normally lowers the temperature enough so the fuel will not vaporize.
I have seen the same problem with my jeep, had the car for about 9 years now and other than now it was a great car. the car struggles to start in the morning will start on the second sometimes 3rd try. and it will run fine for about 20 minutes, will start pulling alittle like it's not getting enough gas. the bigger problem seems to be if i stop and turn off the car if I restart before it completetly cools down is will not only strugle to start but run rough and will almost all the time have missfires. I have repalce fuel pump, injectors, plugs and coil pack it has made a small improvement but still continues to have the problems. If i let it cool down completetly and them start, it will run fine for 20 minutes again. - jonparedes
Tried that...still does the same thing. Does a weird idle and will not let you go more than maybe 10 miles an hour if that. Replaced like the service noticed said...still doing it. - Dumb Blonde
engine stalls and stumbles occasionally - Visitor
I have random misfires in all 6 cylinders, especially in #4,#5 and #6. I also have a small evap sys leak that has been inspected down to removing the hitch,bumper and gas tank. I ran out of money and still have the problems. I bought it this way - moondropps
The computer showed a misfire #3. Changed the fuel injector, the power pack twice, a new clip that goes into the paperback, and the spark plug. All that time and money and the problem continued. The problem was the fuel injector was defected. I'm glad it was under warranty. I love my jeep grand cherokee - Visitor
3rd cylinder misfire by cool motor start, after running it for 15 minutes and start it again car runs normally,
if motor oil is below add car starts normal in the morning by cool motor,
What's the problem ?,have change coil-rack ,clean injectors, change all map-sensors and vacuum lines and walves
. - Bieri
Too many problems at the time, won't be repairing her. Problems with MY 4.7 L, V8 JEEP: 1. Torque converter problem. 2. Buildup inside the engine because the fluids aren't flowing freely throughout, due to broken parts in engine. 3. Line pressure malfunctions 4. EVAP emission leak (well, of course!) 5. Rear right wheel speed and signal malfunction 6. Electrical issues up the butt, this JEEP randomly has the car alarm going off.
Whoever owned JEEP before I did not do their part in caring for the vehicle, unfortunately. I loved it for the 88 days I had it, but will be nothing but a money pit from here on out so I have to let her go. - Visitor
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