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No spark

Tiny
WILLIE L.
  • MEMBER
  • 2000 GMC JIMMY
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 163,000 MILES
Drove vehicle to destination about 45 minutes away it ran perfect. Parked then came back 4 hours later motor turns over. No spark from coil to distributor. Replaced coil and starter control module. Still no spark from coil. Can only assume it's the computer gone bad?
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Monday, July 13th, 2020 AT 6:17 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This could be the VCM but when you say you replaced the starter control module, I assume you mean the Ignition control module? If so, we need to make sure the crank sensor is sending signal as the VCM will pulse the EICM based on this signal. This module is pulsed, it closes the coil and this is what tells the coil to fire.

Basically crank the engine and tell me what voltage you have at each of the points on this diagram.

Let me know and we can go from there. Thanks
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Monday, July 13th, 2020 AT 6:39 PM

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