Question about 1991 Jeep Cherokee Limited

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1991 jeep cherokee no spark still replaced everything except the computer

THIS WAS YOUR ANSWER TO A FORMER CLINENT.
check the wiring to the crank sensor sometimes the wires under the rubber boot breaks on the engine harness side, pull back the rubber and see, you should check for spark if you have none then it is something to do with the crank sensor, did you check the new flywheel for a pickup spot for the sensor? or possibly a dowel pin that should have been transferred to the new flywheel and wasnt? sometimes also there is a procedure to set an air gap between the pickup point on the flywheel and the crank sensor this is very important there mabye shims or an oblonged bolt hole in the sensor please rate -Jeff

I have replaced my crankshaft sensor , first with an after market one and when that one did not work i bought a orig from Jeep. STILL NO SPARK. So you were saying that there is a procedure to set an air gap between the pickup point and the flywheel ? when i replaced it there were no shims, and what do you mean by an oblonged bolt hole in the sensor?
I have also replace the cap, rotor,dist,plugs,wires and coil still no spark and i have a snap on computer i hooked it up to and there are no default codes coming up , except that it say that the FAN relay switch is open or have a short.. where is the relay switch cannot find it. and what about the MAP sensor would that have something to do with it

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Not the flywheel. its the harmonic balancer(crank pulley)/ also check to see if vehicle has a cam sensor.

Posted on Nov 12, 2008

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http://www.scribd.com/doc/18999822/Jeep-Wiring-2
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