Cylinder Compression Pressure (Using Mechanical Compression Gauge)

Check engine mechanical condition with a compression gauge. Ensure battery is fully charged, engine is at normal operating temperature and throttle valve is fully open when checking compression. Remove Auto Shutdown relay from Power Distribution Center (PDC). See Figure . PDC is located in engine compartment. See Figure . Clean spark plug recesses with compressed air. Remove all spark plugs. Install compression gauge into No. 1 spark plug hole. Hold throttle in Wide Open Throttle (WOT) position. Crank engine until maximum pressure is reached. Note pressure reading and repeat for remaining cylinders. See COMPRESSION SPECIFICATIONS  table for correct engine compression pressures.