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.
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
COMPRESSION SPECIFICATIONS
| Application (1) | Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | |||||
| 3.0L | |||||
| (VIN H & J) | 10.0:1 | ||||
| (VIN K) | 8.0:1 | ||||
| (VIN P) | 9.0:1 | ||||
| Compression Pressure | |||||
| 3.0L | |||||
| (VIN H & P) | 171 psi (12.0 kg/cm2 ) | ||||
| (VIN J) | 185 psi (13.0 kg/cm2 ) | ||||
| (VIN K) | 156 psi (10.9 kg/cm2 ) | ||||
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