How to Judge Throttle Carbon Deposition

The most obvious feature of dirty throttle is the acceleration of wall thickness and unstable idle speed, which the owner can basically feel directly. In order to clean the throttle, the following steps are required: 1. First, if there is a plastic heat shield on the engine, it must be removed first. If you remove the hood, you will usually see the throttle. There are several air pipes around the throttle. You need to remove these pipes and remember their positions. 3. After removing the air pipeline of the throttle, you can remove the whole throttle. Junda's throttle is fixed on the engine block with four bolts, which can be removed immediately with suitable tools. The side of the throttle near the combustion chamber is generally dirty, and the black carbon deposits are mainly clean parts. 4. Cleaning the throttle is mainly to remove carbon deposits on it, and special throttle cleaning liquid or purifying agent can be used. It should be noted that the cleaning principle of this cleaning agent is dissolved carbon, and its composition is harmful to human body. It is best to wear gloves and masks when cleaning. 5. Spray the washing powder to the position of carbon deposition on the throttle and wait for carbon deposition. The time is about 5- 10 minutes. Using brushes can speed up the removal of carbon deposits. 6, see the throttle dirt completely dissolved, you can use a clean towel to wipe the detergent in the throttle. The picture above is a beautiful back of the accelerator, and there is no trace of carbon deposition. 7. Install the clean throttle valve on the main engine according to the original position, and then install all air pipelines to complete the process of cleaning the throttle valve. After all hardware is installed, the throttle must be initialized. There are three ways to judge valve carbon deposition. They are: 1, disassembling method, disassembling the engine and checking whether there is carbon deposit. This is intuitive, but it takes time and energy. In addition, what kind of parts are loaded and unloaded every time will affect the performance and shorten the life. 2. Remove the endoscope, spark plug or fuel nozzle, and observe the carbon deposition degree of the valve with an endoscope. Although this method is convenient, not all maintenance enterprises have this kind of equipment, because the cost of endoscope is very small and it is of little use for maintenance. 3. Observe the change of feedback voltage, and read the change of feedback voltage of oxygen sensor with diagnostic computer. In general, the feedback voltage of the normal oxygen sensor fluctuates between 0.3-0.7V, and the maximum value and the minimum value change alternately for 8 times within 10 second. If the valve is carbon-deposited, the feedback voltage of the oxygen sensor will change greatly.