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I have an 83 S10 with the 2.8 Carb engine. I had an intermittent problem with it getting hot and losing spark, let it cool down, fires right up with no issue. Knowing that ICMs tend to be an issue, I swapped it out, AND YES, I used the thermal grease. I drove the crap out of it for the next 3 days with no issue. I went to show my friend the truck, and it cut out in my driveway, and it wasn’t even warm. I went out the next day, and it still doesn’t start, sat 2 more days, and it still doesn’t start. With my work schedule, I will be messing with it Wednesday. I really don’t want to fire up the parts cannon. I feel like my next step would be to put a new coil on it. Other than that, I am at a loss for ideas. Any help and input would be appreciated.
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Perhaps check the wiring to the ICM… Perhaps something went awry with the wiring after installation… I chased a similar issue like this down for 3 hours when I determined that that wiring for the Crank position sensor had gotten frayed by the belt.. The sensor tested perfectly at the plugs, but the visual inspection caught it…. Not the exact same thing I know, but look over the wiring first…
Also, before you throw a new coil at it, I would truly diagnose what is going on. If you need assistance, use Eric’s crank no start from the Troubleshooting FAQs at the top of the page and his video….
-Karl
I’d check for switching at the coil -. If you don’t see switching, then the problem is likely before the ICM. If you do see switching, then it’s likely a problem with the coil itself. More info here.
http://www.ericthecarguy.com/faq/solving-automotive-no-start-problems
Keep us posted and good luck.
Also check the distributor rotor for grounding to the distributor shaft. Look inside of the bottom of the rotor;sometimes you may find a powder smear that is indicative of spark leakage through to the distributor shaft.
Quick update. I pulled the ICM out, and the cheap grease they give you with it seems to have disappeared except for a little dab. So, I cleaned it and put a nice healthy dose of dielectric grease under it, and it seems to be running fine. The hour drives each way I am about to do should tell me if it is fixed.
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