Why is there a gasoline smell after starting a sedan?

[WalkerAnn]

Sedans emit a gasoline smell after starting due to cold weather causing an imbalance between the intake air volume and the injected air-fuel mixture ratio. When the sedan starts, the throttle valve is closed, and air intake relies on the bypass valve. The ECU determines the fuel injection volume based on temperature and oxygen sensors. To achieve the engine's optimal working condition, the fuel injection volume increases, and the bypass valve's air intake volume also rises. It is normal for a gasoline smell to occur during cold starts in sedans, and most vehicle models experience this. However, if the gasoline smell appears during hot idling, it indicates a malfunction in the sedan, requiring immediate repair.