What Causes a Strong Gasoline Smell During Cold Engine Start?

[LaSophia]

Causes of a strong gasoline smell during cold engine start: 1. The temperature is too low, preventing some of the air-fuel mixture from burning completely; 2. Issues with the carbon canister or its solenoid valve, leading to an overly rich mixture during startup; 3. Excessive carbon buildup inside the engine, resulting in poor atomization of the air-fuel mixture; 4. The solenoid valve remains closed, causing gasoline vapor to accumulate in the carbon canister; 5. Leakage from the fuel injectors. A cold engine start refers to starting the engine after it has been off for a period of time, with its internal temperature matching the ambient temperature. In contrast, a hot engine start occurs when the engine is restarted shortly after being turned off, while it still retains significant residual heat.