1990 Cherokee Laredo 4.0L won't start - JeepForum.com

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post #1 of 5 Old 09-26-2006, 10:02 PM Thread Starter
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1990 Cherokee Laredo 4.0L won't start

I have been experiencing this problem for several weeks now.

It will run fine for days and then all of a sudden NOTHING.

I have checked several things for the cause of the problem i.e.; Fuel Pump, Fuel Pump Relay, Fuel Filter, etc...

I was reading that it might be the Cranckshaft Position Sensor?? I was told that it was located on the driver's side of the bellhousing and it was a PITA to get off but for some reason I cannot locate this mystery part?? there is nothing on the drivers side of the bellhousing on my JEEP and now my JEEP is not starting at all. It usally starts after awhile but today it just cranks and cranks

anything anyone can suggest would be GREAT!!!

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post #2 of 5 Old 09-27-2006, 06:09 AM
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Look into the engine compartment and floow the bell housing up and down till you find a wiring harness (couple of wires in a loom) coming out of it. The sensor is pretty well recessed into the housing.

Find it and find the connector for it. Disconnect it and reconnect it a couple of times to clear the contacts. The try it again.

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post #3 of 5 Old 09-27-2006, 09:57 PM
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also look into a factory alarm. my chip fried and was making a semi-connection...sometimes. i had to remove the alarm and then i had no problems...and still dont over 5k miles later...happy as can be.

oh, an easy way to test this is to short the starter relay (with it in neutral or park) and see if it still starts...or beat the starter a few times with a deadblow or rubber mallet to see if it's the starter.
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post #4 of 5 Old 09-27-2006, 11:07 PM
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that thing on the bellhousing is a crank position sensor, and yes it could be the cause of your no start problem.
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post #5 of 5 Old 09-27-2006, 11:30 PM
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Originally Posted by xjawgi
that thing on the bellhousing is a crank position sensor, and yes it could be the cause of your no start problem.

11 O'Clock position of the bellhousing if your looking from the tranny, 1 O'Clock if your looking from the engine bay. The connector is right behind the throttle body. It is held on the bellhousing by 2 bolts spaced like 2 inches apart with the sensor inbetween. Hope that was descriptive enough.

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