Mechanical Inspection: Compression

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions. Ensure battery is fully charged and throttle valve is fully open when checking the compression. Ensure electrical connector is disconnected from ignition coil to prevent engine from starting when performing compression test.

WARNING: DO NOT use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system.

COMPRESSION SPECIFICATIONS

Application

psi (kPa)

Normal Compression Pressure

⁽¹⁾

Minimum Compression Pressure

100 (690)

Maximum Variation Between Cylinders

⁽²⁾

⁽¹⁾	Information is not available from manufacturer.

⁽²⁾	Maximum variation is 25 percent.