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Discussion Starter #1
I have a 1995 YJ 4 Cylinder that is not getting spark to the plugs. Have changed the coil, distirbuter, rotor, and crank sensor. What is the most likely culprit?
 

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Usually when there's a no spark situation the Ignition Control Module is bad.
Not always, the ECM can also go bad and cause this. I would suggest to the OP to check the fuses for the ign. There is one under the hood by the battery and one under the dash by the PB assembly. If these are good then I would check to see if you are getting voltage to the coil. Not to long ago another fellow Jeeper had an issue like this and it was the coil connecter one plug was falling out of the connecter and not making contact to the coil.
 

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Discussion Starter #4
Not always, the ECM can also go bad and cause this. I would suggest to the OP to check the fuses for the ign. There is one under the hood by the battery and one under the dash by the PB assembly. If these are good then I would check to see if you are getting voltage to the coil. Not to long ago another fellow Jeeper had an issue like this and it was the coil connecter one plug was falling out of the connecter and not making contact to the coil.
Not sure how all of this works but should the coil have 12 volts to it any time the switch is on because it does not. I guess I need to read up on how the ignition works. I understand points and condensers but not much about electonic ingition. Guess that is what I get for being old.
 

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Also according to my Chiltons book, you need to be checking for voltage while cranking the engine. Also try swapping out the auto shutdown relay under the hood by the battery with the horn relay.
 

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Discussion Starter #10
Thanks very much. Will have to try it this weekend. Only have limited time to work on the project. Do you know what triggers the Auto Shutdown Relay to shutdown the spark and fuel?
 
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