Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 765 (ENGINE MECHANICAL - 6.6L - INTRODUCTION)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE COMPRESSION TEST
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Engine Compression Test
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Engine Compression Test
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Tools Required
- J 26999 Compression Gage. See Special Tools .
- EN-47603 Compression Gage Adapter. See Special Tools .
- J 43244 Relay Puller Pliers
- Ensure that the vehicle's batteries are in good condition, and fully charged.
- Operate the vehicle until the engine is at normal operating temperature.
- Shut off engine.
- Disable fuel delivery system, by removing the IGN 1 relay with J 43244 .
- Disconnect glow plug nut; remove all 8 glow plugs. All 8 glow plugs must be removed from the engine during each cylinder test to obtain valid test results.
- Prior to taking a compression reading, verify the cranking speed is greater than 140 RPM. If the cranking speed is below 140 RPM, repair the slow cranking speed condition before continuing with the compression test. Refer to Engine Cranks Slowly in Engine Electrical.
- Install the EN-47603 in the glow plug hole for the cylinder that is being checked. See Special Tools .
NOTE:
Do not add oil to any cylinder during a compression test as extensive engine damage may result.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.