Mechanical Inspection: Compression
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.
NOTE:
Before checking engine compression pressure ensure engine oil level is correct. Ensure starter motor and battery are operating properly.
Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions. Start engine and allow to operate until coolant temperature is 176-205°F (80-96°C). Check engine compression with engine at specified cranking speed, all spark plugs removed and throttle wide open.
COMPRESSION SPECIFICATIONS
| Application | (1) Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | |||||
| Accent (1.5L) | 10.0:1 | ||||
| Elantra (2.0L) | 10.3:1 | ||||
| Sonata | |||||
| 2.4L | 10.0:1 | ||||
| 2.5L | 10.0:1 | ||||
| Tiburon (2.0L) | 10.3:1 | ||||
| Compression Pressure | |||||
| Accent (1.5L) | 220-234 psi (15-16 kg/cm2 ) | ||||
| Elantra (2.0L) | 199-213 psi (14-15 kg/cm2 ) | ||||
| Sonata | |||||
| 2.4L | 178 psi (12 kg/cm2 ) | ||||
| 2.5L | 149-170 psi (10-12 kg/cm2 ) | ||||
| Tiburon (2.0L) | 199-213 psi (14-15 kg/cm2 ) | ||||
| Maximum Variation Between Cylinders | |||||
| All Models | 14 psi (1 kg/cm2 ) | ||||
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