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No compression in cylinder six

Tiny
STNBOWRY
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 122,000 MILES
Cause the miss and oil is fouling the plug.
Saturday, March 7th, 2020 AT 1:05 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

If you have no compression, it could any of the following:

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

1. Burned valve or valves.

2. Hole in a piston.

3. Broken valve spring on the valve.

All these need to be checked to confirm.

Most likely the head will have to come off to determine the failure. You may want to consider replacing the engine with a good used engine.

Roy
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Saturday, March 7th, 2020 AT 1:41 PM
Tiny
STNBOWRY
  • MEMBER
  • 4 POSTS
So it's a most they have to take out the engine?
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Sunday, March 8th, 2020 AT 8:52 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Most likely, yes.

It looks like either an overhaul or replacement.

Roy
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Sunday, March 8th, 2020 AT 2:35 PM

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