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.
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open. See COMPRESSION SPECIFICATIONS table.
COMPRESSION SPECIFICATIONS
| Application (1) | Specification | ||||||
|---|---|---|---|---|---|---|---|
| Compression Ratio | |||||||
| 1.5L (VIN A) | 9.0:1 | ||||||
| 1.8L (VIN C) | 9.5:1 | ||||||
| 2.0L | |||||||
| (VIN F) | 8.5:1 | ||||||
| (VIN Y) | 9.6:1 | ||||||
| 2.4L (VIN G) | 9.5:1 | ||||||
| 3.0L | |||||||
| (VIN H) | 8.9:1 | ||||||
| (VIN J) | 10.0:1 | ||||||
| (VIN K) | 8.0:1 | ||||||
| (VIN P) | 9.0:1 | ||||||
| 3.5L (VIN M & P) | 9.0:1 | ||||||
| Compression Pressure | |||||||
| 1.5L (VIN A) | 192 psi (13.4 kg/cm2 ) | ||||||
| 1.8L (VIN C) | 199 psi (13.9 kg/cm2 ) | ||||||
| 2.0L (VIN F) | 178 psi (12.5 kg/cm2 ) | ||||||
| 2.0L (VIN Y) | 170-225 psi (11.7-15.5 kg/cm2 ) | ||||||
| 2.4L (VIN G) | 192 psi (13.4 kg/cm2 ) | ||||||
| 3.0L | |||||||
| (VIN H & P) | 171 psi (12.0 kg/cm2 ) | ||||||
| (VIN J) | 185 psi (13.0 kg/cm2 ) | ||||||
| (VIN K) | 156 psi (10.9 kg/cm2 ) | ||||||
| 3.5L (VIN M & P) | 171 psi (12.0 kg/cm2 ) | ||||||
| Maximum Variation Between Cylinders (2) | 14 psi (1.0 kg/cm2 ) | ||||||
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