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Juan Crespo
Juan Crespo, Tech Trainer
Category: Car
Satisfied Customers: 1526
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Having issues burning out ignition control modules on a

Customer Question

having issues burning out ignition control modules on a 09-94 LLV postal truck
Submitted: 1 year ago.
Category: Car
Expert:  Juan Crespo replied 1 year ago.

Hi there.

The most common cause for ignition module failure on these GM engines is overheating, which can be the result of poor mounting insulation, an overcharging alternator putting out excessive voltage, or high engine compartment temperatures.

Make sure there is sufficient thermal grease between the module and the distributor body.

Check ignition primary circuit voltage at the Black/White wire on the module's two-wire connector - should be the same as charging system voltage and stay at an average 13 to 14 volts.

Some folks have customized the wiring in order to be able to relocate the modules away from engine heat; others have installed external fans.

Please let me know if you need further assistance with this issue.

Best Regards.