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Compression

Tiny
AARON BLACQUIERE
  • MEMBER
  • 2005 BUICK RENDEZVOUS
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have 190 lbs on cylinders one, three and five and 150 on two, four and six what could cause that and what is the compression supposed to be?
Saturday, May 5th, 2018 AT 6:28 AM

3 Replies

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

The compression is within specs. Considering the age of the vehicle and mileage, it is good.

The difference may be from work performed at one time whether it was a head gasket on valve job.

It will not effect the operation of the engine at all.

The spec is 140-165. The 190 is a little high but that could be the result of carbon build up.

Do you have a concern?

Roy
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Saturday, May 5th, 2018 AT 6:49 AM
Tiny
AARON BLACQUIERE
  • MEMBER
  • 4 POSTS
What is the best way to get rid of carbon build up without tearing down the head?
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Saturday, May 5th, 2018 AT 8:21 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
A product call Seafoam is a good product.

Also, GM top engine cleaner is another good one for carbon build up.

Roy
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Saturday, May 5th, 2018 AT 12:38 PM

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