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Engine has no spark?

Tiny
RON GIACOMA
  • MEMBER
  • 1996 CHEVROLET VENTURE
  • V8
  • 2WD
  • AUTOMATIC
  • 13,500 MILES
I've replaced the coil, ignition module, crank censor and still no spark from the coil. This is an intermittant problem and sometimes there is spark but right now there is no spark from the coil.
Ron
Tuesday, December 8th, 2009 AT 7:40 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The intermittent no spark can be due to a bad crankshaft position sensor.
A faulty crank sensor will not send any signal to the ECM and there will be no spark generated.
Heat and vibration from the engine can make the crank sensor loose its internal calibration and that can send in correct data to the ECM. Which can trigger no spark. It can also shut the engine down, if it was running.

You might find these articles helpful:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
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Wednesday, September 22nd, 2021 AT 7:40 PM

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