Does the valve click normally?

The abnormal sound of the valve belongs to the mechanical failure of the valve. Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. It is connected with the air filter at the top and the engine block at the bottom, and is called the throat of the automobile engine. Precautions for replacing the valve cover are as follows: 1. When replacing, thoroughly clean the contact surface. Stick as long as you can, because it will stick for a long time, and it can be done without sticking, depending on the owner's wishes; 2. The engine must be completely cooled before it can be replaced; 3. When installing the valve cover, tighten it diagonally several times. After fixing the screw, fix the screw at its opposite corner. This can prevent uneven stress on the valve cover gasket.