Engine Compression
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
COMPRESSION SPECIFICATIONS
| Application | Specification | |||
|---|---|---|---|---|
| Compression Ratio | ||||
| 2.5L | 9.1:1 | |||
| 4.0L | 8.7:1 | |||
| 4.7L | 9.0:1 | |||
| Compression Pressure | ||||
| Normal | 120-150 psi (8.3-10.5 kg/cm2 ) | |||
| Maximum Variation Between Cylinders (1) | 30 psi (2.1 kg/cm2 ) | |||
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