Engine Compression

Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.

COMPRESSION SPECIFICATIONS

Application

Specification

Compression Ratio

3.1L

8.8:1

3.3L

9.0:1

3.4L

VIN S

9.0:1

VIN X

9.3:1

3.8L

VIN L

9.0:1

VIN 1

8.5:1

4.3L

9.3:1

Normal Compression Pressure

⁽¹⁾

Minimum Compression Pressure

⁽¹⁾

⁽¹⁾	Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm² ).