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Home >> Mitsubishi >> 1991 >> Precis Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Engine Compression

Engine Compression

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Ensure engine is at normal operating temperature, battery is fully charged and starter is operating properly. Remove all spark plugs and hold throttle valve wide open. Crank engine at least 6 revolutions per cylinder to determine engine compression. Engine cranking speed should be 250-400 RPM.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio
1.5L 9.4:1
2.4L 8.5:1
3.0L 8.9:1
Compression Pressure (1)
1.5L 192 psi (13.5 kg/cm2 )
2.4L 150 psi (10.5 kg/cm2 )
3.0L 150 psi (10.5 kg/cm2 )
(1) Maximum variation between cylinders is 14 psi (1.0 kg/cm2 ).