Why Does the Car Emit a Strong Gasoline Smell When First Started?

[LaCole]

If the car emits a strong gasoline smell upon starting, which disappears after the engine warms up, it is generally a normal phenomenon. The details are as follows: 1. During a cold start, the water temperature and exhaust pipe temperature are relatively low. At this time, the air-fuel mixture is richer, so some of the mixture does not burn completely and is expelled through the exhaust pipe. This results in a noticeable gasoline smell, which is normal. 2. Especially in winter, when the outside temperature is very low, the car cannot reach its normal operating temperature immediately after starting. The car's computer will then increase the fuel injection volume based on the intake air temperature and water temperature signals. The increased fuel injection, combined with a small amount of unburned fuel vapor being expelled, leads to a stronger gasoline smell.