Coil burnout


Old 05-07-07, 11:11 PM
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Join Date: May 2000
Location: las mexico,
Posts: 32
Coil burnout

I,m thinking of buying a 93 grand cherokee 4.0 eng. 180.000 miles. The guy said he had to replace the coil 2 times. What can cause a coil go out so fast. He did not say how long it took for it give out the jeep runs fine.
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Old 05-08-07, 08:30 PM
Join Date: May 2006
Location: Iowa!!!!!
Posts: 3,769
High resistance in the plug wires.
Old 05-09-07, 10:21 AM
Michael's Avatar
Join Date: Nov 2005
Posts: 56
93 jeep

I would look at the ballast resistor. Check the voltage at the "bat" side of the coil it should be less than 12 volts when the engine is running. It only gets full voltage when cranking, not running.

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