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 SPECIFICATION
| Application | psi (kg/cm2 ) | Ratio | |
|---|---|---|---|
| Cabriolet | 131-174 (9.0-12.0) | 8.5:1 | |
| Corrado | |||
| 1.8L | 116-174 (8.0-12.0) | 8.0:1 | |
| 2.8L | 160-189 (11.2-13.3) | 10.0:1 | |
| Fox | 131-174 (9.0-12.0) | 9.0:1 | |
| Golf & GTI | 131-174 (9.0-12.0) | 10.0:1 | |
| Jetta | |||
| 1.6L (Diesel) | 406-493 (28.5-34.7) | 23.0:1 | |
| 1.8L | 131-174 (9.0-12.0) | 10.0:1 | |
| Jetta GLi | 145-190 (10.0-13.0) | 10.0:1 | |
| Passat | 116-174 (8.0-12.0) | 10.8:1 | |