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What are the effects of carbon deposits on fuel injector nozzle? And How to clean the it?

2020-06-15

The fuel injector nozzle is actually a simple solenoid valve. When the solenoid coil is energized, suction force is generated, the needle valve is sucked up, the injection hole is opened, and fuel is ejected at high speed through the annular gap between the needle of the needle valve head and the injection hole , Forming a mist, which is good for full combustion. Next, the editor will explain the impact of the fuel injector nozzle carbon deposit and how to clean it.


What are the effects of carbon deposits on fuel injector nozzle


As a fuel injector nozzle, one of the key components of the EFI engine, its performance will seriously affect the performance of the engine. Blockage of the fuel injection nozzle will seriously affect the performance of the car. The cause of the blockage is because carbon deposits in the engine are deposited on the fuel injector or impurities in the fuel block the fuel injector passage. After the car has been driving for a period of time, certain deposits will form in the fuel system. The formation of deposits is directly related to the fuel of the car: first, because gasoline itself contains gums, impurities, or dust and impurities brought in during storage and transportation, a sludge-like deposit is formed on the car fuel tank, fuel inlet pipe, etc. The second reason is that the unstable components in gasoline react at a certain temperature to form a gum and a resin-like viscous substance. These sticky materials are in the fuel injection nozzle, intake valve and other parts. When burning, the deposits will become hard carbon deposits.


In addition, due to urban traffic congestion, cars are often in low-speed and idling states, which will increase the formation and accumulation of these deposits. Fuel system deposits are very harmful. Deposits will block the needle valve and valve hole of the fuel injector nozzle, affecting the performance of the precision components of the electronic injection system, resulting in reduced power performance; deposits will form carbon deposits in the intake valve, causing it to close tightly, resulting in engine idle speed Stability, increased fuel consumption and worsened exhaust emissions; deposits will form hard carbon deposits on the piston crown and cylinder head, etc. Due to the high thermal capacity of the carbon deposits and poor thermal conductivity, it is easy to cause engine shock and other failures; in addition, it will shorten The life of the three-way catalyst. The work of the fuel injection nozzle is good or bad, which plays a fundamental role in the power of each engine. Poor fuel causes the nozzle to work poorly, causing serious carbon deposits in the cylinder; accelerated wear of the cylinder barrel and piston ring, resulting in unstable idle speed, increased fuel consumption, weak acceleration, difficulty in starting, and excessive emissions. Grease nipple damages the engine.


How to clean the fuel injector nozzle


When you need to clean, you need to choose a specific choice-the amount of fuel injection control: the same type of EFI vehicle, the pressure of the gasoline pump is constant, regardless of the opening of the throttle valve, as long as it is adjusted by the fuel pressure regulator, the fuel injection Mouth pressure is always constant. The fuel injector nozzle is strictly matched with the fuel pump and fuel pressure regulator. Only with the designed pressure can the fuel injection nozzle achieve the best atomization effect. The pressure is lower than the design pressure, and the sprayed oil is not mist-like and is columnar. It is not suitable to be mixed with air; if the pressure is too large, the sprayed oil is in the shape of a conical surface, and it is not easy to mix, and the power of the spray is too large. A lot of fuel is sprayed directly on the pipe wall, which directly affects the mixing ratio parameter.


Whether it is accelerating or idling, the pressure should be constant. Different models also have different pressures (Some options for washing machines mentioned by some people are actually pressure selections for different models, not different pressures for accelerating idling speed. The injection pressure is selected incorrectly and the atomization of the fuel injector nozzle is poor. ). The amount of fuel injection depends on the length of injection time. According to the different control methods of the electromagnetic coil, the fuel injector is divided into two types: voltage-driven and current-driven.


The voltage type is also divided into low resistance and high resistance. The high resistance can be connected to 12V, the low resistance can only be connected to low voltage, and the wrong connection at 12V will burn the coil for a long time. When injecting oil, the voltage provided by the computer is constant, for example, 12V, and it will immediately become 0V when the oil is cut off. This change is instantaneous, just like the concepts of 0 and 1 in the computer language. There is no 0.5 in the middle. In other words, this is a pulsating direct current signal, not a term such as alternating current. What is the concept of alternating current? The alternating positive and negative is called alternating current. It seems that there is basically no AC in the car except for the parts before the generator rectifier. When the fuel injector nozzle is blocked, the fuel injection is not smooth, or there is carbon deposit and glue in the gap between the fuel injector nozzles, and the designed fuel injection amount or atomization effect cannot be achieved.

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