Engine Compression

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 1992 Pontiac Sunbird, 1992 Pontiac Grand Prix, 1992 Pontiac Grand Am, 1992 Pontiac Firebird, and 1992 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.

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

"F" Body

8.5:1

"J", "L" & "W" Bodies

8.8:1

3.3L

9.0:1

3.4L

9.25:1

3.8L

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 ).