NEED HELP Compression testing

[Johnnyjh84]

What should the engine compression readings be in a 05 trailblazer?

 

[Mooseman]

A Google search yielded this site:

Chevrolet Workshop Service and Repair Manuals > TrailBlazer 4WD L6-4.2L VIN S (2002) > Engine, Cooling and Exhaust | Engine | Compression Check | System Information | System Diagnosis | Cylinder Leakage Test | Page 2858

TrailBlazer 4WD L6-4.2L VIN S (2002) > Chevrolet Workshop Service and Repair Manuals > Engine, Cooling and Exhaust | Engine | Compression Check | System Information | System Diagnosis | Cylinder Leakage Test | Page 2858

workshop-manuals.com

A normal reading should be approximately 1482 kPa (215 psi). The lowest reading
should not be less than 70 percent of the highest reading.

 

[Johnnyjh84]

A Google search yielded this site:

Chevrolet Workshop Service and Repair Manuals > TrailBlazer 4WD L6-4.2L VIN S (2002) > Engine, Cooling and Exhaust | Engine | Compression Check | System Information | System Diagnosis | Cylinder Leakage Test | Page 2858

TrailBlazer 4WD L6-4.2L VIN S (2002) > Chevrolet Workshop Service and Repair Manuals > Engine, Cooling and Exhaust | Engine | Compression Check | System Information | System Diagnosis | Cylinder Leakage Test | Page 2858

workshop-manuals.com

I was getting 170 to 180 PSI on all of them I have 189k on it what does this mean???

 

[TollKeeper]

170-180 is actually not a bad number, its within 10% of each other, and its above the 70% drop. Doesnt sound bad to me..

I have to ask, what made you want to do a compression test?

 

[Johnnyjh84]

Mù

 

[Mooseman]

Mù

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