Twin Cam Engine — Troubleshooting (Hyundai Sonata Y3)

When determining engine faults, it is essential to start checking with the main systems. If the engine does not start, the idle mode is unstable, the car accelerates poorly, start checking the following main systems.

1. Electric power supply.

• 1) Battery
• 2) Fuse link
• 3) Fuse box

2. Grounding the case.

3. Fuel supply.

• 1) Fuel supply pipeline
• 2) Fuel filter
• 3) Fuel pump

4. Ignition system.

• 1) Spark plug
• 2) High voltage cable
• 3) Ignition coil

5. Exhaust gas toxicity reduction system.

• 1) PCV positive crankcase ventilation system
• 2) Exhaust gas recirculation system (EG3R)
• 3) Leakage in the vacuum line

6. Others.

• 1) Setting the ignition timing
• 2) Idle speed

Fuel injection system faults are often caused by poor contact at the wiring harness connectors. Make sure they are connected properly.

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