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Home >> Lexus >> 1997 >> GS 300 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Specifications >> Mechanical Checks >> Engine Compression

Engine Compression

To check engine compression, bring engine to normal operating temperature. Disconnect distributor electrical connector(s). Disconnect fuel injector connectors. Remove air intake hose from throttle body. Remove all spark plugs. Fully open throttle. Ensure engine cranking speed is at least 250 RPM when measuring compression.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 10.0:1
Compression Pressure 185 psi (13.0 kg/cm2 )
Minimum Compression Pressure 156 psi (11.0 kg/cm2 )
Maximum Variation Between Cylinders 14 psi (1.0 kg/cm2 )