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

Weird no spark problem

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Old 01-02-2011, 10:18 AM
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Default Weird no spark problem

Car left me stranded New Years Eve with a no spark condition.

Now, the problem seems to be intermittent. I have the pulse coming to the ICM(I have a spare opti I turn real slow to test this) and 12 volts on A and D, as well as a ground on C. This is with the connector unplugged.

The weird part is that when I have spark coming off the coil wire(with ICM connector plugged in), I also have good voltage on pin B, but when the car dies and there is no spark, I hook up my spare opti and the signal is very weak on pin B. But ONLY with the connector plugged in. I can unplug it and the voltage is fine.

Intermittent problems SUCK!

Thanks in advance for any help!!
Old 01-02-2011, 11:09 AM
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It's definitely looking like ICM. I can heat it up and no spark... cool it off and I get spark again.

It actually gets warm with just the key forward... no idea why it would do that?!?! lol
Old 01-16-2011, 03:43 PM
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It was the ICM.




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