How to test Ignition Module / Coil Packs - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-27-2005, 03:14 PM   #1
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Default How to test Ignition Module / Coil Packs

If anyone could help me out with some detailed instruction on how to test the Ignition Module and Coil Packs.

It would be greatly appreciated. Thanks.
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Old 09-27-2005, 03:16 PM   #2
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Best way? Swap with a known good set. Bench testing ICM'* is flaky at best, even by shops.

Can you fill us in on your symptoms first?
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Old 09-27-2005, 07:09 PM   #3
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The coils (and presumably ICMs) are the same in a wide variety of applications. For example, my dad'* 2001 Regal is showing symptoms that may be related to ignition coils (hard starting during damp weather only). If I can't fix the problem by putting some di-electric grease on the wire connections, I am planning to put the coils from my 93 Bonneville on and see if it works. I checked on the acdelco website, and both cars use the same coils.

Chilton'* calls for measuring the resistance on the coils to test them.
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Old 09-27-2005, 07:46 PM   #4
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Measuring the resistance works in some cases, and the procedure is in Techinfo for those that want to try.

Be warned that a coil may only fail when hot. That happened to me. Measured fine cold.
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Old 09-28-2005, 11:25 AM   #5
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you could measure coil resistance hot and cold.
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Old 09-28-2005, 11:50 AM   #6
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As well it might be weak.. not sure if that would show on a resistance test.

I wouldn't suggest the finger licking method to test 30,000 volts though.
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