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Engine Compression

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

COMPRESSION SPECIFICATIONS

Application (1) Specification
Compression Ratio
Diamante & Stealth 10.0:1
Montero 9.0:1
Compression Pressure
3.0L (VIN J) 185 psi (13.0 kg/cm2 )
3.0L (VIN K) 156 psi (10.9 kg/cm2 )
3.0L (VIN H & S)
Diamante 196 psi (13.8 kg/cm2 )
Except Diamante 171 psi (12.0 kg/cm2 )
Maximum Variation Between Cylinders 14 psi (1.0 kg/cm2 )
(1) See ENGINE/VIN ID article for VIN information.