How often do you clean the intake valve and throttle valve?

There is no specific time to clean the intake valve and throttle valve, but it can be cleaned once a year. If it is an engine with port injection, the port can be removed for cleaning when removing carbon deposits on the intake valve and throttle valve. If it is an in-cylinder direct injection engine, carbon deposit is likely to appear on the back of the intake valve, and the carbon deposit in the engine should be cleaned regularly. The intake valve is the gateway for the engine to draw air into the engine, and its function is to draw air into the engine and mix it with fuel for combustion. Throttle is a controllable valve that controls air to enter the engine. There are two kinds: traditional cable throttle and electronic throttle. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work.