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Old 11-02-2008, 08:08 PM
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Red face 91 YJ has power but no spark?

Evrything powers up and works properly but no spark. I have done miltiple tests on the plugs but no spark. I have replaced the plugs and the coil. Any ideas on what else i should replace that most likely would be the problem? thanks for the help

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Old 11-02-2008, 08:10 PM   #2
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check cam and crank sensors

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Old 11-04-2008, 07:11 AM   #3
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How about new wires?
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Old 11-04-2008, 12:54 PM   #4
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Mine turned out to be a bad computer.

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Old 11-04-2008, 03:34 PM   #5
that's what she said

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x2 check the ignition control module located on the driverside fender behind the coolant overflow tank.
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Old 11-05-2008, 07:48 AM   #6
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pick up a manual there is a procedure how to use your ecm to diagnose ignition problems,by turning the key on and off in a certain sequence. Very simple I would guess probably 99% accurate. This is cheaper than buying parts you may not need. Another nice tool to own is a sensor tester,I have a cheapy I bought at auto zone. the first time you can diagnose a sensor tester it pays for itself. It probably is either your cam or crank sensor,A spare of each is a good Idea. They can go anytime. goodluck let us know how it turn's out.

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