Mechanical Inspection: Compression
- When checking compression, disconnect connector for crankshaft position sensor, as this prevents ignition and fuel injection systems from operating. Connector for crankshaft position sensor is a 3-pin Black connector located near top of timing belt cover and contains Red, Black and Blue/White wires in the connector.
- 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 | 178 (12.5) |
| Minimum Compression Pressure | 133 (9.4) |
| Maximum Variation Between Cylinders | 14 (.9) |