Mechanical Inspection: Compression
Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions. Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.
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 | |||
| Accent (1.5L) | 10:1 | ||
| Elantra (1.8L) | 10.0:1 | ||
| Sonata | |||
| 2.0L | 9.0:1 | ||
| 3.0L | 8.9:1 | ||
| Tiburon (2.0L) | 10.3:1 | ||
| Compression Pressure | |||
| Accent (1.5L) | 234 psi (16 kg/cm2 ) | ||
| Elantra (1.8L) | 213 psi (15 kg/cm2 ) | ||
| Sonata | |||
| 2.0L | 170 psi (12 kg/cm2 ) | ||
| 3.0L | 170 psi (12 kg/cm2 ) | ||
| Tiburon (2.0L) | 213 psi (15 kg/cm2 ) | ||
| Maximum Variation Between Cylinders (All Models) | 14 psi (.9 kg/cm2 ) | ||