Mechanical Inspection: Compression

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

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.

ENGINE COMPRESSION ⁽¹⁾

Application

Specification

Compression Ratio

9.0:1

Compression Pressure at 250 RPM

Standard

206 psi (14.5 kg/cm² )

Minimum

135 psi (9.5 kg/cm² )

⁽¹⁾

Maximum variation between cylinders is 28 psi (2 kg/cm² ).