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.
COMPRESSION SPECIFICATIONS
| Application | psi (kg/cm2 ) | |
|---|---|---|
| Normal Compression Pressure | ||
| All Models | 128-199 (9.0-14.0) | |
| Minimum Compression Pressure | ||
| All Models | 109 (7.7) | |
| Maximum Variation Between Cylinders | ||
| All Models | 44 (3.1) | |