Envoy 4WD V8-5.3L VIN M (2005)
Compression Check: Specifications
Non-DoD
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Compression Ratio ............................................................................................................................................................................................. 9.95:1
With the engine running and the cylinder NOT in DoD mode, the compression gage reading should increase quickly to greater than 345 kPa (50 psi).
DoD Mode
With the engine running and the cylinder in DoD mode, the compression reading should be less than 172 kPa (25 psi).
