Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or engine analyzer. See engine analyzer manual for specific instructions.
DO NOT use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. 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.
ENGINE COMPRESSION SPECIFICATIONS (4-CYLINDER)
| Application | Specification | |
|---|---|---|
| Minimum Compression Pressure | ||
| All 2.2L & 2.5L | 100 psi (7.0 kg/cm2 ) | |
| Maximum Variation Between Cylinders | ||
| All 2.2L & 2.5L | 25 Percent | |
ENGINE COMPRESSION SPECIFICATIONS (V6)
| Application | Specification | |
|---|---|---|
| Minimum Compression Pressure | ||
| 3.0L | 178 psi (12.5 kg/cm2 ) | |
| 3.3L & 3.8L | 100 psi (7.0 kg/cm2 ) | |
| Maximum Variation Between Cylinders | ||
| 3.0L, 3.3L & 3.8L | 25 Percent | |