Diesel car, after the car started, smelled a diesel smell outside the car.

Gasoline vehicles use the throttle to control the air-fuel ratio. By controlling the air-fuel ratio, refueling and fuel reduction can be realized, that is, idle speed is controlled, and diesel vehicles use oil pumps to control fuel injection. Similarly, diesel vehicles will also increase fuel injection during cold start, so cold vehicles will suddenly rise to more than 2000 rpm, and then will soon drop to more than 1000. After a few minutes of warm-up, the idle speed will slowly drop to about 800 or 900, and the water temperature will also increase with the decrease of idle speed.