Cylinder Compression Pressure

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.

Ensure battery is fully charged and starter motor is in good operating condition. Engine should be at room temperature. Disconnect wiring from ignition module. Clean spark plug recesses with compressed air and remove spark plugs. Hold throttle valve in wide open position. For each cylinder, crank engine through 4 compression strokes. Record compression pressure from fourth revolution. Continue test for remaining cylinders. See ENGINE COMPRESSION SPECIFICATIONS table. Install and tighten spark plugs to 13 ft. lbs. (18 N.m).

ENGINE COMPRESSION SPECIFICATIONS

Application

Specification - psi (kPa)

Normal Compression Pressure

⁽¹⁾

Minimum Compression Pressure

⁽¹⁾

Compression Variance

⁽²⁾

⁽¹⁾	Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (689.5 kPa).

⁽²⁾	Information is not available from manufacturer.