C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Ignition Control Module

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Old Mar 28, 2006 | 07:54 PM
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navyseal3
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Default Ignition Control Module

Some parts places list a 4-prong ICM for my 85 and others list a 7 prong.

Before I open it up,what do you guys have in yours?

Any name brand suggesstions? Hypertech stuff any good?
\
NS3
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Old Mar 29, 2006 | 08:57 AM
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If you don't have any ignition system mods, I'd go with the stock AC/Delco ICM.
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Old Mar 29, 2006 | 11:10 AM
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You have a 7 pin ICM...go with AC Delco or you'll be sorry next week.
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Old Mar 29, 2006 | 11:32 AM
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Originally Posted by navyseal3
Some parts places list a 4-prong ICM for my 85 and others list a 7 prong.
Not YOUR 85. Somebody isn't reading the catalog (computer?) correctly or know what he's doing. Four prong modules are for mechanical and vacuum advance HEIs. The 7 prong modules are for the ECM controlled HEIs. All EFI GM cars have ECM controlled ignition.

RACE ON!!!
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Old Mar 29, 2006 | 02:05 PM
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Why not pull it out and have it checked? Autozone does it for free, just make sure they run it through 10 cycles to get it hot. AND, make sure when you re-install it you put dialectic grease under it-or it will get hot and burn out.
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Old Mar 29, 2006 | 03:43 PM
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Radio Shack sells a small (6.5 gram) tube of Heat Sink Compound for $1.99. This is enough to do an ICM.

It's part number 276-1372; their website lists it as "heat sink grease", but the label on the package clearly reads "heat sink compound."

You can use this, too, if you don't have di-electric grease or if the replacement module fails to include it in the packaging. Sometimes they do, sometimes not.
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Old Mar 29, 2006 | 08:53 PM
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Thanks,I appreciate it.

No I have not read the manuals & books you folks have.This is the first car I have owned in over 30 years.

Been in the Navy,overseas most of the time.

I know Jets(F/A-18F),Not Vettes...............Just learnin'...

NS3
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