Check engine compression under the following conditions: engine at normal operating temperature and specified cranking speed, all spark plugs removed, and throttle wide open.
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| 4.9L (VIN B) | 9.5:1 | |
| 5.0L (VIN E & F) | 9.3:1 | |
| 5.7L (VIN 7) | 9.8:1 | |
| 5.7L (VIN 8) | 10.25:1 | |
| Normal Compression Pressure | ||
| 4.9L (VIN B) | 140-165 psi (10-12 kg/cm 2 ) | |
| All Others | (1) | |
| Minimum Compression Pressure | (1) | |
| (1) The lowest compression reading should not be less than 70 percent of the highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). | ||
| (1) | The lowest compression reading should not be less than 70 percent of the highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). |
COMPRESSION SPECIFICATIONS