Tachometer spikes and drops instantly usually killing the engine. It happens @ 50mph or 0mph and everywhere in between. It runs fine when it's running and gives absolutely no warning before it dies. The CEL has not come on (yes, it works) 1ce since this began about 1 yr ago. At first it didn't stall, the Tach just jumped around but it has gotten progressively worse. Now it can die 2ce in 1 mile or just threaten to for 3 days. It has no problem cranking over and always restarts (so far), sometimes after sitting for 20-30 minutes. Conditions during occurrence such as temp, distance, speed, clutch depressed or not, coasting, accelerating, idling, etc…are always different. Electrical draw (radio, elec windows, etc…) doesn’t seem to affect it. I had the distributor cap replaced in 07, replaced the sparkplugs and wires 18 months ago. Checked for loose/damaged connections @ battery, grounds, & alternator. I am at a loss. No one I’ve talked to has any idea what it could be. I hope you guys have some suggestions.Thanx!
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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" .
The PO441 has to do with your HO2S 2 (Oxygen sensor). You need to check to make sure the wire is not off of the sensor and check the grounds to the Oxygen sensor. Could be a bad Oxygen Sensor. The other code has to do with your Evap system Purge solenoid circuit. Has to do with detecting an improper voltage level. Could be a shorted Purge solenoid.
Sorry to say, but you might have some serious problems. I'll list 3 vague the possibilites, best-case scenario to worst.
1. You blew a gasket, oil pan, timing cover, valve cover. Any gasket that holds engine oil in. If this blew out, you would lose oil, the light would come on (low PSI) and the motor would sieze.
2. You have a serious clog somewhere in you oiling system which caused a PSI spike, blowing a line or gasket. The clog is a problem, which comes from sludge and deposits. Oil ports, holes and lines in the engine are fairly small and not difficult to clog if the oil and filter are neglected.
3. The worst thing that could have happened is you blew your motor. Overrevving, driving to hard without letting it warm up or again, neglecting the oiling system. You may have thrown a rod through the engine block, dropped a valve, spun a bearing or lost a main seal. The main seal is the least serious, but the labor is still extensive.
In your '94, If the engine stopped on it's own (you didn't shut it off), it probably siezed. In many cases this is not repairable. Start car shopping.