gmc Workshop Repair Guides

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Compression Check: Specifications

The lowest reading cylinder should not be less than 8.5 psi of the highest and no cylinder reading should be less than 820-1172 kPa (119-170 psi). 
Perform compression test with engine at normal operating temperature, spark plugs removed and throttle wide open.

Engine, Cooling and Exhaust > Engine > Compression Check > System Information > Specifications

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