Engine Compression
When making compression checks, disconnect ignition switch connector Pink wire from high energy ignition system. Remove air cleaner. With throttle and choke wide open, and all spark plugs removed, crank engine through at least 4 compression strokes.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | |||||
| 5.0L | |||||
| Calif. | 8.6:1 | ||||
| Federal | 9.2:1 | ||||
| 5.7L | |||||
| Light Duty | 8.2:1 | ||||
| Heavy Duty | 8.3:1 | ||||
| 7.4L | 7.9:1 | ||||
| Compression Pressure | 150 psi (10.5 kg/cm2 ) | ||||
| Maximum Pressure Variation | (1) 30% | ||||
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