What are the causes of idle vibration in the Hyundai Elantra?

[VanCatherine]

The causes of idle vibration in the Hyundai Elantra: 1. Ignition system issues: Poor performance of the ignition system or improper spark plug firing can lead to idle vibration; 2. Unstable oil pressure: It is recommended that the owner visit a 4S shop to check the fuel supply pressure and the intake pressure sensor for normal operation. If the fuel pump supply pressure is abnormal or the intake pressure sensor values are incorrect or malfunctioning, it can cause body vibration; 3. Severe engine carbon buildup: When there is excessive carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the engine will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits will be drawn into the combustion chamber by the engine's vacuum suction and burned, making the air-fuel mixture overly rich. The engine's combustible mixture alternates between lean and rich, causing idle vibration after a cold start.