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Home >> Jeep >> 1998 >> Grand Cherokee 5.9 Limited >> Repair and Diagnosis >> Engine Performance >> Specifications >> Engine Controls - Specifications - 5.9L >> Mechanical Checks >> Engine Compression

Engine Compression

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

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 9.1:1
Normal Compression Pressure (1) 120-150 psi (8.3-10.5 kg/cm2 )
Maximum Variation Between Cylinders (2)
(1) Minimum compression pressure is about 100 psi.
(2) Manufacturer does not provide information for 5.9L.