What is the reason why Jetta is not easy to catch fire?

The reason why Jetta is not easy to catch fire is as follows: 1, because there are too many carbon deposits in the throttle, idle motor or air intake. 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. 2. 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 starting again, and finally leads to the difficulty in starting. 3. Because the activated carbon canister is damaged. If the solenoid valve is always on, the mixture at the intake of the engine will always be very thick, causing the phenomenon that the mixture is too rich to start when the car is hot.