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No Spark?

Tiny
BILL21551
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
I have a no-spark condition. It cranks fine. According to the service manual, there should be a 1-4V AC signal to the ignition module coming from the VCM from pin 9 on connector 3. There is none. The manual says to replace the VCM. I did. There is still no signal, no start.
What conditions would exist such that there would be no signal going to the ignition module?
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Thursday, August 3rd, 2023 AT 9:39 AM

2 Replies

Tiny
BILL21551
  • MEMBER
  • 2 POSTS
I solved the problem. It was the crankshaft position sensor. I couldn't find anything in the service manual to indicate this as a possible source of the no-signal condition, and there was no code to indicate a malfunction. Thanks for trying to help.
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Thursday, August 3rd, 2023 AT 3:06 PM
Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Hello BILL21551,

Thank you for sharing that information with us. It will help someone in the future. I am glad to hear you got everything working.

If you need anything else, please let me know or start a new question.

I apologize I wasn't able to get to you sooner.

Thank you,
Brendon
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Thursday, August 3rd, 2023 AT 3:37 PM

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