As one of the key components of the EFI engine, the fuel injector, its working quality will seriously affect the performance of the engine. The cause of the blockage is that carbon deposits in the engine are deposited on the fuel injection nozzle or the fuel injection nozzle passage is blocked by impurities in the fuel.

How the Fuel Injector Functions

The function of the fuel injector is to accurately deliver the fuel to the engine for combustion. The car injector is a simple solenoid valve. When the solenoid coil is energized, suction is generated, the needle valve is sucked up, the nozzle is opened, and the fuel is sprayed at high speed through the annular gap between the needle and the nozzle of the needle valve head, forming a mist, which is good for full combustion.

Two Spraying Methods for Fuel Injectors

One type of injection into the intake manifold is called intake manifold injection, and the other type of direct injection into the cylinder is called direct injection. The principle of their injector structure is the same, but the pressure they bear is different. The pressure of the oil line of the intake manifold is generally 2-8 kg, and the oil pressure is 1 kg after the daily flameout. This is also a parameter for judging whether there is a problem with the oil circuit. In-cylinder direct injection is high-pressure injection, and its pipeline oil pressure can reach 24-200 kg.

The intake manifold injection is injected into the intake pipe and then enters the engine through the valve, so it has the function of cleaning the valve. At the same time, it is easy to burn and burns more fully, which is not conducive to the generation of carbon deposits. However, due to the long distance, the fuel injection is not accurate enough, resulting in increased fuel consumption and lack of power.

Why the Fuel Injector Functions Improperly

After the car has been driven for a period of time, certain deposits will form in the fuel system. The formation of sediments is directly related to the fuel of automobiles:

Firstly, because gasoline itself contains colloids, impurities, or dust and impurities brought in during storage and transportation, sludge-like deposits are formed over time in automobile fuel tanks, fuel inlet pipes, etc.;

Secondly, due to unstable components in gasoline It reacts at a certain temperature to form a gluey and resinous viscous substance. When these sticky substances are burned in the fuel injectors, intake valves, etc., the deposits will become hard carbon deposits.

In addition, due to urban traffic congestion, cars are often at low speed and idling, which will aggravate the formation and accumulation of these deposits. Deposits in the fuel system are very harmful. The deposits will block the needle valves and valve holes of the fuel injectors, affect the working performance of the precision parts of the electronic injection system, and cause the power performance to decrease; the deposits will form carbon deposits on the intake valves, causing them to close tightly and causing the engine to idle. Stability, increased fuel consumption and worsening of exhaust emissions; deposits will form hard carbon deposits on the piston crown and cylinder head. Due to the high heat capacity of the carbon deposits and poor thermal conductivity, it is easy to cause malfunctions such as engine knocks; in addition, it will shorten The life of the three-way catalytic converter.

The performance of fuel injectors plays a fundamental role in the power of each engine. Due to poor fuel, the fuel injector does not work properly, 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. In severe cases, the injection will be completely blocked. Oil nipple, damage the engine.

Clean Your Fuel Injector Regularly

Therefore, it is necessary to clean the fuel injection nozzle regularly. Long-term non-cleaning or frequent cleaning of the nozzle will cause bad effects. As for the cleaning time, it should be determined according to the car's condition and the quality of the fuel added at ordinary times. Generally speaking, most users are now recommended to clean about 20,000 to 30,000 km. With good vehicle conditions and good fuel quality, it can be extended to about 40,000 to 60,000 km. When the fuel injector is slightly blocked, it will also have a certain impact on the vehicle condition. Sometimes there will be such a failure: when the car is in a gear, starting, the car is a little jittery, waiting for a high gear, and when accelerating, this phenomenon disappears. It is assumed that the various sensors on the car are working normally, the throttle valve has been cleaned, and the circuit is normal. , It is likely that the fuel injector is slightly clogged. However, when accelerating in a high gear, the slight gum may be sprayed away (dissolved) again, and the performance of the car will be restored. Such a slight blockage of the fuel injection nozzle generally does not need to be cleaned. Because the slight gum can be dissolved away.

Therefore, in daily driving, you should always run at high speed to reduce the possibility of carbon deposits. When the gasoline quality is poor or the vehicle is running for a long time, if the fuel injector is not cleaned for a long time, this blockage will be more serious, which will cause poor fuel injection, poor fuel injection angle and poor atomization, resulting in engine idling and acceleration. Or it does not work well under full load conditions, which makes the engine power drop, fuel consumption rises, and emission pollution increases, and even makes the engine unable to work. Therefore, the fuel injection nozzles should be carefully cleaned and tested regularly to ensure that they are working well.