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.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| Corrado SLC & Passat | 10.0:1 | |
| EuroVan | 8.5:1 | |
| Compression Pressure | ||
| Corrado SLC & Passat | 157-186 psi (11.0-13.0 kg/cm2 ) | |
| EuroVan | 128-170 psi (9.0-12.0 kg/cm2 ) | |
| Minimum Compression Pressure | ||
| EuroVan | 100 psi (7.0 kg/cm2 ) | |
| All Others | 106 psi (7.5 kg/cm2 ) | |
| Maximum Variation Between Cylinders | ||
| All Models | 43 psi (3.0 kg/cm2 ) | |