Engine Mechanical problem
1998 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 149000 miles
I have a 1998 Jeep Cherokee Sport with a 6 cylinder engine. Recently, I have had problems when I have driven it in hot weather. Several times, after I have stopped the car and turned it off, I have been unable to restart it. Once, the engine cut out on me while driving. The one time it cut out on me while driving, it was a very hot day and I had been driving for about an hour up a mountain. I had a mechanic check the battery and the alternator, and both were just fine, no problems at all there. I thought it might be vapor lock and have tried lifting the hood and placing wet rags on the gas lines, which has worked all but once which was the same time that the engine cut out on me while driving. I had a mechanic perform a computer diagnostic, which indicated that the crankshaft sensor is sometimes not registering. The mechanic said that if the crankshaft sensor is not registering, the computer will not allow the engine to start or to continue running. I asked the mechanic to replace the sensor at that time, but he could not get the part and I was far away from home. We waited a couple of hours until things cooled off and then I was able to start the car again and drive home. This has happened at least half a dozen times over the past 2 months and each time it has happened in extremely hot weather this summer. (I haven't had this problem in previous summers.) I have a few questions:
1. If this is vapor lock, why does it usually occur after I have turned the car off?
2. Is this something caused by the heat, or is it merely a coincidence that this has occurred on the hottest days this summer?
3. Could this be caused by a faulty crankshaft sensor or did the crankshaft sensor become faulty because of this?
4. Should I be looking somewhere else in the engine or electrical areas?
5. What can I do to fix this? (If you have more than one idea or suggestion, please let me know.)
Wednesday, September 16th, 2009 AT 12:14 AM