Mechanical Inspection: Compression

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.

Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions.

Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open. See COMPRESSION SPECIFICATIONS table.

COMPRESSION SPECIFICATIONS

Application

Specification

Compression Pressure ⁽¹⁾⁽²⁾

All Models

156-185 psi (11.0-13.0 kg/cm² )

⁽¹⁾	Engine cranking at 200-300 RPM with throttle open fully.

⁽²⁾	Maximum variation between cylinders is 8 psi (.5 kg/cm² ).