What Are the Reasons for Difficulty Starting After a Hot Engine Shutdown?

[EvangelineLee]

Difficulty starting after a hot engine shutdown can be attributed to the following reasons: 1. Fuel injector leakage. While fuel injection is normal, leakage constitutes an additional fuel supply. The more severe the injector leakage, the richer the air-fuel mixture becomes, leading to difficulty starting when the engine is hot. 2. Faulty carbon canister purge valve. During a hot start, fuel atomization occurs normally and does not require additional fuel vapor. If the carbon canister continues to supply fuel vapor to the intake manifold, it can result in an overly rich air-fuel mixture, making it difficult to start. 3. Fuel quality. After a hot engine shutdown, the engine compartment remains at a high temperature. If the fuel is highly volatile, it can form excessive vapor pressure in the fuel rail. When this pressure exceeds the fuel system's pressure, vapor lock occurs, causing the fuel injector to deliver excessively lean fuel vapor, resulting in difficulty starting.