LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 1994 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Specifications >> Mechanical Checks >> Engine Compression
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Compression

Check engine compression at normal operating temperature at specified cranking speed. Release fuel pressure, remove left air duct and disconnect power transistor connectors. Remove left harness connector bracket and ornamental rocker covers. Disconnect harness connector between ignition coil and power transistor. Remove ignition coil bracket and bracket with ignition coils. Remove all spark plugs, and hold throttle wide open.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 10.2:1
Normal Compression Pressure (1) 185 psi (13.0 kg/cm2 )
Minimum Compression Pressure (1) 142 psi (10.0 kg/cm2 )
Maximum Variation Between Cylinders 14 psi (1.0 kg/cm2 )
(1) Measured at 300 RPM.