LT1-LT4 Modifications 1993-97 Gen II Small Block V8

hot weather problems

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Old Jul 26, 2006 | 11:44 AM
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Default hot weather problems

My 95 z28 has new brand spanking new optispark,wires, plugs and coil.Ican drive it all night long when the outside temp is 70 or lower and it runs like a champ but when i drive during the day at 90 degrees and up it starts missing bad, and the rpm's at idle go up and down from about 700to 1500. The temp gauge dosent get over 180 degrees. Whats up with that?
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Old Jul 26, 2006 | 11:50 AM
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maybe your coil is overheating?
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Old Jul 26, 2006 | 12:28 PM
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I thought about that but how would i correct that problem
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Old Jul 26, 2006 | 03:09 PM
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or the ICM is over heating and causing that problem...
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Old Jul 26, 2006 | 08:57 PM
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Mine did almost the same thing and it was the ICM.If you have a bud with an LT-1 just switch them out to test it,if not I dont think any auto parts store can test them.So takeing it to the dealer to test would cost almost as much as a new one.
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Old Jul 26, 2006 | 09:00 PM
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Proven fact-The ICM and heat get along about as good as Lebbanon and Isreal.Hope the spelling is close......
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Old Jul 27, 2006 | 08:19 AM
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forgive me for being stupid but what is the icm and where is it
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Old Jul 29, 2006 | 05:18 PM
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Ignition Control Module,its located on the same bracket that the coil is on.
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Old Jul 29, 2006 | 06:28 PM
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thanks for the info. I am gonna get one monday
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Old Jul 29, 2006 | 07:00 PM
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also try the icm cooling mod to space it away from the head. That has helped some.
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