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No power and smoking

Tiny
TONY MAGGARD
  • MEMBER
  • 2004 CHEVROLET COLORADO
  • 3.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 202,000 MILES
Got the truck and it had a miss in it. I drove it for about 3 months. While pulling a small trailer, it lost power and found cylinder 2 and 5 had no compression. Now it's smoking and not power at all.
Saturday, February 26th, 2022 AT 8:50 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

There are a few reasons why you have low/no compression on any given cylinders.
Could be due to bad piston ring, bad valve, dropped valve seat etc. It can also be due to a blown head gasket.

You mentioned it is smoking, what color is the smoke? Typically, with blow head gasket you will have white smoke out of the tailpipe.

The best course of action would be to take a look at each possibility to figure out what is going on.

If you have a blown head gasket, it will allow oil and coolant to mix, and you will have milky white color oil.

Take a look at this guide, it covers the typical issues:

https://www.2carpros.com/articles/the-reasons-for-low-compression

Please let me know if you have any questions.
Thank you.
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Saturday, February 26th, 2022 AT 12:51 PM

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