How often is the throttle valve cleaned in Lang Wei?

The throttle valve in Lang Wei needs to be cleaned every 30,000 kilometers, and the carbon deposition of the throttle valve needs to be checked regularly. Too much carbon deposition in the throttle will lead to the blockage of the fuel filler door, serious power decline, unstable idle speed and possibly flameout. If the throttle has serious carbon deposition, it needs to be replaced in time. There are three methods to judge throttle carbon deposit: 1. Disassembly method: disassemble the engine and check the carbon deposit. This method is intuitive, but time-consuming and laborious, and will affect the performance and service life of parts. 2. Endoscopy: Remove the spark plug or fuel nozzle, and observe the degree of carbon deposition on the valve with an endoscope. This method is more convenient, but you need to buy an endoscope, and not all maintenance companies are equipped with this equipment. 3. Observe the change of feedback voltage: read the change of feedback voltage of oxygen sensor with a diagnostic computer, thus indirectly detecting the existence of carbon deposit. Generally speaking, the normal feedback voltage of oxygen sensor fluctuates between 0.3-0.7V, and there should be eight alternating changes of maximum and minimum values within 10 second. If the valve produces carbon deposit, the feedback voltage fluctuation of the oxygen sensor will become larger.