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No spark at all?

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Okay, did you replace the coil control module?
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Thursday, September 28th, 2023 AT 10:06 AM
Tiny
AYME
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  • 15 POSTS
Yes, changed ICM. Had spark last night. Now we don't have spark. Driving us crazy! WTH. We have a truck that uses the same coil and ICM. We swapped them out and they work on the truck. The ICM was bad so changed that. Both worked on truck. Put them on the Suburban. Had spark. Now no spark. Gremlins, lol.
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Thursday, September 28th, 2023 AT 10:35 AM
Tiny
AYME
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We took them off and checked them again and they both work on truck. Still no spark when put back on Suburban.
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Thursday, September 28th, 2023 AT 10:36 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
It sounds like the PCM is bad, if you are getting no pulse at the coil and the PCM is seeing RPM the ignition driver inside the PCM is bad. Here is how to change the unit out or send it in for testing. You can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.
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Thursday, September 28th, 2023 AT 12:37 PM

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