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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 464 (ENGINE MECHANICAL - 2.2L (LN2))DIAGNOSTIC INFORMATION AND PROCEDURESENGINE COMPRESSION TEST
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Engine Compression Test

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Engine Compression Test
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Perform the following steps in order to conduct a compression test for VIN 4:

  1. Conduct the following steps in order to check cylinder compression:
    1. 1.1. Engine should be at room temperature.
    2. 1.2. Disconnect wiring from the ignition module.
    3. 1.3. Remove the spark plugs.
    4. 1.4. Throttle body valve should be wide open.
    5. 1.5. Battery should be at or near full charge.
  2. For each cylinder, crank engine through four compression strokes.
  3. The lowest reading cylinder should not be less than 70 percent of the highest.
  4. No cylinder reading should be less than 689 kPa (100psi).

    Important:  The results of a compression test will fall into the following categories:

    • Normal - Compression builds up quickly and evenly to specified compression on each cylinder.
    • Piston Rings - Compression low on first stroke. Tends to build up on following strokes but does not reach normal. Improves considerably with addition of oil.
    • Valves - Compression low on first stroke. Does not tend to build up on the following strokes. Does not improve much with addition of oil. Use approximately three squirts from a plunger-type oiler.
RENDER: 1.0x

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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.