During compression test, engine must be at normal operating temperature, all spark plugs removed, and throttle valve must be in WOT position. See COMPRESSION SPECIFICATIONS table. Crank engine through 4 or more compression strokes.
| Application | Compression Ratio | |
|---|---|---|
| 4.5L (VIN 5) DFI | 9.0:1 | |
| Compression Pressure | ||
| 4.5L | 140-165 (9.8-11.6 kg/cm 2 ) | |
| All Others (Min.) | 100 psi (7.0 kg/cm 2 ) | |
| Max. Variation Between Cylinders | 30% | |
COMPRESSION SPECIFICATIONS