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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Compression (J30)
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Compression (J30)

Check engine compression at normal operating temperature at specified cranking speed. Release fuel pressure. See FUEL SYSTEM. Disconnect crankshaft position sensor harness connector. Remove all spark plugs. Depress accelerator pedal fully to hold throttle valve wide open. See COMPRESSION SPECIFICATIONS table.