Bad ICM the culprit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cfan10 · 06-23-2019, 07:36 AM

I've been tinkering with the c10 mechanical side, timing, new battery. I tried to start it the other day, kept cranking but wouldn't start.
I redid the timing bringing it to tdc, pulled the distributor put a coil I had laying around, tried that one and smelled something like burnt plastic. Took it out, put the other coil back in installed a brand new icm I had for a few years, now I turn the key everything works cluster, headlights, electric fuel pump but try to start and nothing. I dropped the starter tested it with a battery works fine. Can an icm be brand new and not function, I did use heat sink compound on distributor base and icm.
Anyway to test an icm out of the vehicle, checked the pick up coil when I had the distributor out its intact.
I also bottle tested the fuel pump and it half filled a 2 liter bottle in a short time.

'84 c10 350 hei street fire distributior and 3 years old but was working fine a few months ago.

As always thanks in advance for your time and advice it is greatly appreciated!

dmack91 · 06-23-2019, 12:48 PM

Mine did the same thing last month. Started fine one day, nothing the next. Found I had no spark. Did a bunch of reading on testing the components. I swapped in a spare cap/coil, and it fired right up.

Axle · 06-23-2019, 01:39 PM

12 volts going to the distributor in crank AND run key position?

06-23-2019, 07:36 AM	#1
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Bad ICM the culprit? I've been tinkering with the c10 mechanical side, timing, new battery. I tried to start it the other day, kept cranking but wouldn't start. I redid the timing bringing it to tdc, pulled the distributor put a coil I had laying around, tried that one and smelled something like burnt plastic. Took it out, put the other coil back in installed a brand new icm I had for a few years, now I turn the key everything works cluster, headlights, electric fuel pump but try to start and nothing. I dropped the starter tested it with a battery works fine. Can an icm be brand new and not function, I did use heat sink compound on distributor base and icm. Anyway to test an icm out of the vehicle, checked the pick up coil when I had the distributor out its intact. I also bottle tested the fuel pump and it half filled a 2 liter bottle in a short time. '84 c10 350 hei street fire distributior and 3 years old but was working fine a few months ago. As always thanks in advance for your time and advice it is greatly appreciated! __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

06-23-2019, 12:48 PM	#2
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 763	Re: Bad ICM the culprit? Mine did the same thing last month. Started fine one day, nothing the next. Found I had no spark. Did a bunch of reading on testing the components. I swapped in a spare cap/coil, and it fired right up. __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress

06-23-2019, 01:39 PM	#3
Axle Registered User Join Date: Jul 2011 Location: SW Ontario Posts: 1,212	Re: Bad ICM the culprit? 12 volts going to the distributor in crank AND run key position?



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