What are the possible reasons for severe vibration in the Teana?

[StHayden]

Severe vibration in the Teana is likely caused by the following reasons. Severe engine carbon deposits: The most common cause of car vibration is excessive dirt in the throttle body or carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits. Engine misfire: Engine misfire mainly refers to one or more cylinders not working properly, manifested as obvious intermittent exhaust gas flow and severe shaking of the exhaust pipe, with noticeable engine vibration. Inconsistent air-fuel mixture: When the engine's air-fuel mixture is sometimes lean and sometimes rich, it causes idle vibration after a cold start. The lower the temperature, the more fuel is required for a cold start.