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 Pressure | |||
| 1.8L Turbo | |||
| Normal | 145-189 psi (10.0-13.0 bar) | ||
| Minimum | 102 psi (7.0 bar) | ||
| Maximum Variation Between Cylinders | 44 psi (3.0 bar) | ||
| 2.8L | |||
| Normal | 131-203 psi (9.0-14.0 bar) | ||
| Minimum | 109 psi (7.5 bar) | ||
| Maximum Variation Between Cylinders | 44 psi (3.0 bar) | ||