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Home >> Plymouth >> 1981 >> Arrow Pickup Custom, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Tune-Up >> Compression Pressure >> Notes
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Compression Pressure: Notes

Check compression pressure with engine at normal operating temperature, choke and throttle valves wide open and engine at cranking speed (250 RPM). Crank engine at least 6 "puffs" per cylinder to determine engine compression.