Why can't the Audi A6L start when the engine is hot?

[Juliana]

The reasons why the Audi A6L cannot start when the engine is hot are as follows: Fuel injector leakage: Fuel injection by the injector is normal, but leakage constitutes additional fuel supply. The more severe the injector leakage, the richer the air-fuel mixture becomes, leading to difficulty in starting when the engine is hot. Damaged carbon canister solenoid valve: During a hot start, fuel atomization is normal and no additional fuel vapor is needed. If the carbon canister continues to supply fuel vapor to the intake manifold, it will cause an overly rich air-fuel mixture, resulting in difficulty starting. Faulty intake air temperature sensor: The intake air temperature sensor adjusts the fuel injection quantity. If it malfunctions, it can cause difficulty in starting when the engine is hot.