87 wrangler with 258 spark problem. - JeepForum.com
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Unread 02-20-2003, 06:51 AM   #1
Big Bill 33
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Join Date: Aug 2002
Location: Sylacauga, AL 35150
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87 wrangler with 258 spark problem.

My daughters 87 quit the other day and we cannot get it cranked. Upon futher checking I am not getting a spark from any off the plug wires. I have voltage at the connector on the distributor where it hooks to the wiring harness. Also when I turn the engine over I have voltage at the end of the wire fron the coil to the dist, but no voltage out the dist wires to the plugs. Any suggestions as to what to check. Also there is a steady voltage of about 13 volts to both sides of the coil, I know on my cj that one side has less voltage than the other, could this be a problem. All replies are greatly appreciated. Thanks for the post.

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Unread 02-24-2003, 08:10 PM   #2
critters
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Location: new york
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no spark

hi,this is from the factory shop manual

possible causes
bad cap or rotor
bad control module or bad ground
short in coil
defective ecu (computer)
i had the same problem in my 89 and it was the computer.
hope this helps. critterbill
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Unread 02-24-2003, 10:32 PM   #3
CSP
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You should have the same voltage on both sides of the coil when cranking. It will go down on one side once the key is in the run position. Sounds like either a bad ignition module or a bad pickup coil in the distributor.

Is this a 258 or a four cyl?
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Unread 02-25-2003, 06:42 AM   #4
Big Bill 33
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Location: Sylacauga, AL 35150
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Thanks for the help folks. It was the 16 dollar ignition module. It runs great now and even gets better gas mileage.
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