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
| Application | Pressure psi (kg/cm2 ) |
|---|---|
| Normal Compression | 142-171 (10-12) |
| Minimum Compression | 114 (8.0) |