When vehicle owners are maintaining their cars, they often involve "fuel system cleaning". What does "wash"? Can you not "wash"? What does it have to do with the performance of a car? The following will quickly answer these questions. "Fuel system cleaning" is to solve the carbon deposition in the fuel system. To understand the former, we must first recognize the latter. Carbon deposition refers to the gum produced by the combustion of oil and fuel in the combustion chamber, which is mainly composed of hydroxyl acid and asphaltene. These substances will adhere to the valve, the edge of the cylinder, the top of the piston, the spark plug, the combustion chamber, and the hard cemented charcoal formed by the repeated high temperature effect of the engine. Carbon accumulation has a hundred harm to the engine performance, which will cause the following problems: increasing the thickness and quality of the valve, affecting the accuracy of the valve opening and closing; attaching to the cylinder, affecting the thermal conductivity of the cylinder, the electrode end of the spark plug and the skirt of the insulating body, affecting the ignition effect; reducing the burning effect. The actual volume of the chamber affects the compression ratio. The above problems are gathered together, making the engine light the fuel consumption increase, insufficient power, noise increase, the heavy start is difficult, the idle speed is unstable, and the tail gas exceeds the standard. There must be a cause for it. Carbon deposits never happen in the new engine that just goes off the line. In fact, it can be attributed to the following 6 points: low, poor air quality, poor traffic, low shift speed, long vehicle placement, and less maintenance and maintenance. 1. the fuel quality is low. If the oil refining process is not good, the refined oil will contain more impurities and hydrocarbons. Olefin is an unsaturated hydrocarbon, which is easily polymerized into colloid and deposited in the environment after heating. Another hydrocarbon in fuel is aromatic hydrocarbon. Because of its high density, high viscosity and poor atomization effect, the injection angle of the nozzle is easy to be reduced and the oil droplets become larger, and the combustion of fuel is incomplete. Experiments show that aromatic hydrocarbon is the primary substance to form carbon deposit when gasoline is burning. The more aromatic hydrocarbons in gasoline, the more serious carbon deposition is. In addition, if the fuel contains water and the fuel burns to work, the lower combustion temperature will cause incomplete combustion and carbon deposition. Countermeasures: try to go to regular and large gas stations to ensure oil quality, but a misunderstanding to avoid is "the higher the cleanliness of the label", because the label is the index of fuel anti explosion, not the degree of cleanliness. The low compression engine with high marking fuel will cause the engine power to decline, the noise becomes larger, the fuel consumption is higher, so we should refer to the use manual of the model, and correctly add the fuel for the corresponding label. 2. the air quality is inferior in some areas with low air quality, and the filtration capacity directly caused by solid suspension in the air is reduced, which makes the engine inhale a large amount of dust and impurities to cause abnormal wear. When the valve guide, valve oil seal, piston ring and other parts wear out, part of the oil will enter the combustion chamber to participate in the combustion. Due to the poor combustion performance of oil, more residue will be produced after combustion, which will increase the rate of coke deposition. Countermeasures: when there is wind and sand weather, try not to drive as far as possible, and check the dirty degree of the air filter in the daily maintenance, and change it as the condition is. 3. the traffic condition is poor under the congested road condition, the automobile engine runs at low temperature and low temperature for a long time, so that the fuel can not burn completely, and the carbon accumulation is finally accelerated. Countermeasures: when we go out, we must "think before we act", that is, we should plan the roads and time well, and avoid the congested roads and peak hours as far as possible. This not only reduces the speed of carbon deposition, but also brings about three "smooth" roads: smooth roads, smooth traffic and ease of mind. 4. the low shift speed of the shift speed is the shift of the manual type under 1500r/min, when the engine load is heavy and the working condition is not good, the concentration of the mixed gas is high, and the engine condition is poor under this condition, and the residual gas in the cylinder which is not completely burned will produce the residue. For a long time, carbon accumulation will be generated. In addition, high gear low speed driving vehicles will also cause a similar coking process, because the peak torque of the engine of the household or commercial car is usually set at about 3000r/min, and the very low speed will make the engine run under the poor condition. Countermeasures: the speed of shift can not be less than 1500r/min, and the low speed is easy to cause other problems, such as the serious jitter, which directly affects the driving comfort of 5. vehicles for a long time to stop, and the fuel and oxygen in the fuel tank and oil will produce a colloid after the chemical reaction of the fuel and oxygen in the oil road. When the gum is serious, it converges to form colloidal precipitates, thus blocking the oil path, viscous valves and increasing carbon deposition. In addition, long term parking will bring other serious problems, such as the decrease of the lubrication system due to liquid settlement, the oxidation and corrosion of the metal surface without friction, and the deformation of rubber products. Countermeasures: at least once a week for 1 hours of medium and high speed driving, in fact, "life is in motion" is also suitable for cars. 6. the maintenance and maintenance of vehicles which are not maintained according to the requirements will undoubtedly accelerate the formation of carbon deposits. The gasoline filter does not filter the impurities in the gasoline, the spark plug is not completely ignited, the air filter is blocked and the intake of the air is insufficient and the oil with the metal debris lubrication will become the "hotbed" of the carbon accumulation. As a result, maintenance and maintenance of vehicles not according to requirements not only affect the normal driving of vehicles, but also shorten the service life of vehicles. Countermeasures: maintenance according to the vehicle manual, sometimes the car also understands the feeling, you are good to it, it is also good to you. To deal with carbon accumulation "strategically despise the enemy and attach importance to the enemy tactically", the above introduces the method of preventing carbon accumulation, but in some cases, "years urge the car to be old", the coke is still uninvited after the use of the car for a long time, but the devil is one foot high, the road is high, and the following are two common "washing" carbon deposits. The way. 1. to clean the fuel system through special products and instruments, the whole process is simple and easy to operate, generally not more than 20 minutes, not to disassemble the engine, and will not affect the seal of the engine. However, the cleaning operation requires certain technical requirements, so please be sure to do homework at the 4S shop. The 2. plus protector is added to the fuel tank cleaning protector in a certain proportion in the tank. It can participate in the work process of the whole engine when the car is driving and fuel, and automatically clean up the charcoal, so that the performance of the engine can be recovered to the normal state. But in the use of this product cleaning carbon after cleaning, must be strictly in accordance with the maintenance regulations, because the oil tank and oil pipe cleaned from the gum and sediment are gathered here, if not timely replacement, may cause oil supply is not smooth.