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ICM Repeat Failure

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Roadturn
New User

Oct 18, 2012, 2:51 PM

Post #1 of 5 (2102 views)
ICM Repeat Failure Sign In
My 96 GMC Suburban began cutting out suddenly. I replaced the Ignition Control Module. Problem fixed. A few weeks later, the problem came back. I took the part back to (O'Reilly's) and got another ICM. Problem fixed. Two weeks later, now it's happening again. Bad parts or something else? Your advice is appreciated.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 18, 2012, 2:52 PM

Post #2 of 5 (2094 views)
Re: ICM Repeat Failure Sign In
Replace the ignition coil along with the ICM this time.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Roadturn
New User

Oct 18, 2012, 3:47 PM

Post #3 of 5 (2071 views)
Re: ICM Repeat Failure Sign In
I was wondering about that, Hammer. What is the logic--erratic fire?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 18, 2012, 3:49 PM

Post #4 of 5 (2068 views)
Re: ICM Repeat Failure Sign In
The ICM operates the coil and the coil is drawing too much current through the module and overloading the module.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 18, 2012, 5:20 PM

Post #5 of 5 (2053 views)
Re: ICM Repeat Failure Sign In
Also important to put a thin skin coat of thermal paste on the back of the module and to be sure the heat sink surface where the module mates is clean. Module will overheat if it can't conduct heat to the heat sink.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 18, 2012, 5:20 PM)





 
 
 






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