What is the reason for the smell of raw gasoline when starting a cold engine?

[LaSienna]

The reasons for the smell of raw gasoline when starting a cold engine are: 1. Excessive carbon deposits on the pistons due to cylinder combustion. The cylinder has a certain adsorption effect on gasoline, and excessive carbon deposits can cause a lot of gasoline to adhere to the valves and pistons, leading to insufficient high pressure in the engine and resulting in a stronger smell of raw gasoline; 2. Faulty fuel injector; 3. After the engine is turned off, some gasoline does not fully combust. Since the car is closed, the volatilized gasoline gas fills the car, also causing the smell of raw gasoline; 4. When starting a cold engine in winter, the cold weather makes it harder to ignite, causing some gasoline to be discharged from the exhaust pipe, hence the smell of raw gasoline.