Mechanical Inspection: Compression: Notes
Check engine mechanical condition with a compression gauge, vacuum gauge or an engine analyzer. See engine analyzer manual for specific instructions. See COMPRESSION SPECIFICATIONS .
CAUTION:
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 (1)
| Application | Specification psi (kg/cm2 ) | |||
|---|---|---|---|---|
| Normal Compression Pressure | ||||
| 3-Cylinder | 171 (12.0) | |||
| 4-Cylinder | 199 (14.0) | |||
| Minimum Pressure | ||||
| All Models | 149 (10.5) | |||
| Maximum Variation Between Cylinders | ||||
| 3-Cylinder | 14 (1.0) | |||
| 4-Cylinder | 21 (1.5) | |||
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