Will not start when engine is hot

Tiny
RAY ZAYAS SR.
  • MEMBER
  • 1995 GMC SONOMA
  • V6
  • TURBO
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
When the engine is cold it fires right away, but when it's hot, it cranks but won't start.
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Thursday, June 2nd, 2022 AT 9:09 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

What you described sounds like a faulty crankshaft position sensor. When they start to fail, they are affected by heat.

Take a look through this ink and let me know if it mirrors what you experience:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

If it does, this is what I suggest. When it won't start, check to see if there is spark to the plugs. If there isn't, suspect this sensor. Here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

If you confirm no spark, chances are this is the issue. Here is a link that explains how in general how one is replaced:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

If you look below, I attached the directions specific to your vehicle.

Let me know what you find or if you have questions.

Take care,

Joe

See pic below.
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Thursday, June 2nd, 2022 AT 5:21 PM

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