What is the reason why Ford Focus can't catch fire after cleaning the valve?

When starting for the first time in the morning, step on the accelerator pedal. You can start it successfully by stepping on the accelerator, that is, the accelerator is dirty and needs cleaning. If it doesn't work, just before starting, turn on the ignition switch, wait for three seconds, then turn off the ignition switch, and repeat it three times before starting. If it is successful, it means that the oil pressure of the gasoline pump is insufficient, and it is necessary to check whether the gasoline circuit leaks oil or replace the gasoline pump. If it doesn't work, it may be the water temperature sensor, spark plug and carbon deposit in the cylinder (it needs high-speed operation to clean up the carbon deposit).