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GMC Truck
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2009
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Envoy 2WD L6-4.2L
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Repair and Diagnosis
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Powertrain Management
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Tune-up and Engine Performance Checks
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Compression Check
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Specifications
Compression Check: Specifications
COMPRESSION CHECK
Record the compression readings from all of the cylinders. A normal reading should be approximately 1482 kPa (215 psi)
The lowest reading should not be less than 70 percent of the highest reading