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Old 09-26-2010, 12:44 AM
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ignition control module

i have a 1997 chevy tahoe. i rebuilt the engine and ran into problems tring to get it to run. first icm burnt out which inturn took out the pcm replaced both ran rough for a bit and had to replace both again. now replaced the icm for the forth time and it again burnt out after the enging ran for 5 mins or so. any ideal what would cause the icm to get hot and burn up?

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Old 09-26-2010, 07:59 AM
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Yeah. The ignition COIL has a weak spot in its insulating composistion (plastic) that is allowing secondary voltage ( spark ) to jump across to the primary side (hence the module controlled side) and frying everything. I have had this happen in the past.
I have gotten to the point when I diagnose a no start on one of these and the module is suspect I put a coil on for this very reason. The coil is not that pricey and is good insurance.It is cheaper than replacing everything twice.
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Old 09-26-2010, 04:04 PM
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You may want to also check to see if you pinched a harness somewhere when you dropped the engine back in. Also make sure ALL grounds are connected. Electronic components will fair if they are searching for ground
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