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

Spark issues

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Old Jun 25, 2012 | 02:29 PM
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97Z28LT1's Avatar
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Default Spark issues

Hey guys. This problem started a week ago and has me pretty clueless.

I was driving down the highway, downshifted to pass someone and the car lost spark. The car was running great before it died all of the sudden. I now have a weak amber spark at the plug, but a nice blue arc going from the coil to the opti.

I have replaced the opti, coil, and ICM. It was getting no spark at all, but now I have a really weak spark that will not get the car started. I've also checked the ICM and opti harness via multimeter and it all checks out.

Any ideas?
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Old Jun 25, 2012 | 05:58 PM
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Time to start wiggling connectors. Check that your ICM pigtail is making good connection to the ICM. I couldn't get mine to start for a couple of days after I swapped my Opti, Coil, and ICM, and that was it.
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Old Jun 25, 2012 | 07:48 PM
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I saw your thread and I tried that to no avail. I think I may have it figured out though. I'm going to send the opti back and I'll post to see if a new one works.
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Old Jun 26, 2012 | 10:54 AM
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What brand opti?
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Old Jun 26, 2012 | 07:30 PM
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Delco. Never had a problem with one before.
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