Mechanical Inspection: Compression
Check engine mechanical condition using a compression gauge, vacuum gauge or 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 engine oiling system.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| C70, S70 & V70 | |||
| Non-Turbo | 10.3:1 | ||
| High Pressure Turbo | 8.5:1 | ||
| Low Pressure Turbo | 9.0:1 | ||
| S90 & V90 | 10.7:1 | ||
| Compression Pressure (Minimum) | |||
| C70, S70 & V70 | |||
| Non-Turbo | 184-219 psi (13-15 kg/cm2 ) | ||
| Turbo | 156-184 psi (11-13 kg/cm2 ) | ||