1994 Grand Cherokee, 5.2 V8 shuts off when hot. Cool for an hour or 2, starts up after a half hour or so, then dies again. No trouble codes except 12 and 55; I pulled fuses to check them, hence the code...
NOTE: With the jeep cherokees. the Check Engine light if continuously driven with it on for more than 25 minutes whilst still traveling will engage the "PCM self protect" usually around the 27minute mark,and shut down the vehicle, and yes it takes 90 minutes to reset,
you might find that you will arrive ok, at your destination with this issue... pull up, and then it wont start again a few minutes later, this is the PCM Shutdown protection.....when the check engine light is on means the PCM is reset,found the error and why you can only run the car with the check engine light for about half an hour.
"You can however drive and turn the car off and coast in neutral and turn on the vehicle again to buy yourself more time with the "Check Engine time limit shutoff"
happened to me in mine, the error codes never showed up for the crankshaft position sensor
i replaced the crankshaft position sensor under the transmission case, and it got rid of the issue this crank sensor is a common cause of the cherokees , it could no longer read the speed of the crankteeth. and can't get a reading the car is still running hence the shutdown, also you will find it also controls the PCM to engage your second fan on the radiator because it cant tell the vehicle is still running, and causes the PCM to get confused and wont let the rest of the engine function properly ie: coolant sensors, and Thermostat sensors, and you will find it overheats and needs to cool some times...which is why the PCM shutsdown the car.....try the crankshaft position sensor replacement under the transmission it's usually the cause of this on all cherokees "makes no difference if its a V8 or not by the way, same thing happens on 4.0 straight six engines also" .
Apr 26, 2017 |
Jeep Grand Cherokee Cars & Trucks