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Humid outside or raining, my truck will not start?

Tiny
MWALTZ
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 129,000 MILES
When it is humid outside or raining, my truck won't start. A day or two after the rain stops it will eventually start, but it takes a while and there is a lot of spluttering and shaking. After being run for several minutes, it will backfire and then run with no problem. Is this due to a cracked distributor cap or a cracked gasket in my engine block?
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Wednesday, September 22nd, 2010 AT 11:29 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This is somewhat of a common issue with many of these 6 cylinder GM engines.
This typically happens when you have moisture in side the distributor or the coil pack.
Usually a poor seal under the distributor cap and/or the coil pack, lets moisture inside.
You should able to clean out the distributor and replace the cap with new o-ring.
If there is moisture inside the coil you will have to replace it.

Be sure to inspect the ignition control module as well.

https://www.2carpros.com/articles
https://www.youtube.com/c/2carpros/featured

I have attached the diagrams for your reference.

Please let me know of any questions.

Thank you.
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Sunday, August 8th, 2021 AT 7:20 PM

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