Icm ?
Thread Starter
Drifting
Joined: Aug 2007
Posts: 1,846
Likes: 129
From: Orlando Florida
Icm ?
After getting through my weekend troubles with my car in an earlier thread, my car is running clean again. Now a new problem has emerged. I replaced the coil last week with an MSD. Is it possible this coil is smoking the ICM as I have read this somewhere else before but I am not sure ? As soon as the car got warmed up it would buck, miss and stumble under throttle, idles fine but as soon as I gas it it goes crazy and my tach goes nuts too. Confused I went home, it sat for 30 minutes and I fired it up and it revved fine again until it got hot.
Racer
Joined: Apr 2010
Posts: 409
Likes: 1
From: New York
First of all get rid of the MSD coil. The Coil that comes with the car is plenty enough of a high energy system for the car. I do not trust the msd and have heard they can cause problems with the Opti. After replacing my opti twice that sucker came off and its for sale lol
Second get some washers 8 of them to be exact and move the ICM and coil off the head. Night and day difference with regard to temperatures and longevity of the ICM. You may need a new ICM not sure at this point but it sucks up way to much heat off that head and it is definitely a poor design with respect to being bolted to the head
Second get some washers 8 of them to be exact and move the ICM and coil off the head. Night and day difference with regard to temperatures and longevity of the ICM. You may need a new ICM not sure at this point but it sucks up way to much heat off that head and it is definitely a poor design with respect to being bolted to the head
Burning Brakes
Joined: Apr 2009
Posts: 1,185
Likes: 33
From: Charlotte Michigan
I too put some washers between the head the bracket and the heat sink using some nylon ones so as not to transfer so heat, so that just left the bolts which I bought slightly longer to offset the washers, and it seemed to help as I had similiar problems. I used a napa coil and icm.
Racer
Joined: Mar 2002
Posts: 312
Likes: 6
From: Troy Al
Some interesting points. I fried my OEM ICM when I installed a MSD blaster. I had the old GM unit to put back on the car. Maybe I should chunk the MSD coil, and save a ICM. I understand the heat problem, but wouldn't nylon nuts isolate the unit from it's ground connection? Should a seperate ground connection be ran?
Thanks!
Thanks!
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Melting Slicks
Joined: Jul 2006
Posts: 2,151
Likes: 0
From: Strongsville Ohio
No help with the coil here but I had problems with heat and my ICM going bad. After burning out 3 of them I posted here finding help and someone advised to get the stuff from radio shack in the little tube. ( heavy duty Heat shrink) I have not had a problem with the car not starting. knock on wood
