Question about 1993 Jeep Grand Cherokee

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On a 1993 jeep grand Cherokee 4.0 inline six engine. what would cause the crankshaft positioning sensor to continuously go bad in approximately one to two weeks after installing a new after market sensor., it has done this 4 times already, luckily they have lifetime warranty's on them but they are becoming a pain in the a-- to replace. something as got to be making them go bad so fast. thanks to anyone for any help

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Two items I'd look at. first would be the sensor itself. If you see contact (scuff) marks on the business end of the sensor you may need to shim it back away from the flywheel a bit. Second, if it's failing electrically, check the actual reference voltage of the system.(usually around 5 volts) If it's too high you may have a problem with the computer (voltage regulator is inside) or a bad system ground. (there are at least five ground points.... on fenders, block and firewall) You also need to check the wiring itself for any possibility of shorting to ground. I can understand having a defective unit once, even twice, but after the fourth one there is definitely something abnormal going on there! You can find good wiring diagrams in chiltons repair manual.

Posted on May 14, 2010

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My 1993 Jeep Grand Cherokee turns over but it would not start

Posted on Apr 12, 2011

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