Is the throttle flooded?

It may be mainly caused by excessive carbon deposition in throttle, idle motor, air intake, air intake valve and combustion chamber. Due to too much carbon and dirt in the air inlet, the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake air volume, resulting in too rich or too thin air mixture, abnormal combustion or engine jitter, and even unable to start after starting. Or there is a slight leakage from the fuel nozzle, which causes the fuel to leak into the combustion chamber for a period of time after the vehicle is turned off, which leads to the excessive mixture when restarting, and finally leads to the difficulty in starting. It may be caused by damage to the activated carbon canister. Because if the solenoid valve is always on, the mixture at the engine intake is always enriched, which causes the phenomenon that the mixture is too rich to start when the car is hot.