When to clean car fuel injectors and troubleshooting

Basic introduction of the car Injector

Injector itself is a normally closed valve (normally closed valve means that when there is no input control signal, the valve has been in the closed state; and the normally open valve is when there is no input control signal, the valve has been in the open state, by a valve needle up and down movement to control the opening and closing of the valve.

When the ECU gives the injection command, the voltage signal will cause the current to flow through the coil in the car Injector, generating a magnetic field to suck up the valve needle, allowing the valve to open so that the oil can be sprayed from the injection hole. The biggest advantage of injection fuel supply is that the fuel supply control is very precise so that the engine in any state can have the correct air-fuel ratio, not only to keep the engine running smoothly, the exhaust gas can also meet the specifications of environmental regulations.

Car Injector carbon and impact

As one of the key components of the EFI engine injectors, its work will seriously affect the engine’s performance. Injector blockage will seriously affect the performance of the car. The blockage is due to carbon deposits in the engine on the car Injector or due to impurities in the fuel that block the car Injector pathway.

After the car has been driven 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: firstly, because the gasoline itself contains gum, impurities, or dust and impurities brought in during storage and transportation, etc., which accumulate over time to form deposits similar to sludge in the car’s fuel tank, fuel inlet pipe, and other parts; secondly, because the unstable components in the gasoline react at a certain temperature to form gum and resin-like viscous substances.

These sticky substances are in the car Injector, intake valve, and other parts, and when they are burned, the deposits turn into hard carbon.

In addition, due to urban traffic congestion, the car is often at low speed and idle, which will aggravate the formation and accumulation of these deposits. Fuel system deposits can be very harmful.

Deposits will block the needle valve of the injector, valve hole, affecting the performance of the precision parts of the electronic injection system, resulting in a decline in power performance; deposits will be formed in the intake valve carbon, resulting in its closure is not tight, resulting in engine idle speed instability, fuel consumption increases and with the deterioration of exhaust emissions; deposits will be formed in the piston top and cylinder head and other parts of the hard carbon, due to the high heat capacity of carbon and poor thermal conductivity, easy to cause, in addition, it will shorten the life of the three-way catalytic converter. The car Injector works well, the power of each engine plays a fundamental role.

As a result of poor fuel injectors do not work, so that the cylinder carbon serious; cylinder barrel, piston ring to accelerate wear, resulting in unstable idle speed, fuel consumption, acceleration, starting difficulties and emissions exceed the standard, serious will completely block the injector, damage to the engine.

Therefore, to regularly clean the car Injector, long-term non-cleaning or frequent cleaning nozzle will cause bad effects. As for the time of cleaning, according to the condition of the car and usually add the quality of the fuel to determine, in general, most users are now recommended to clean around 20 to 30,000km. Good condition and fuel quality can be extended to about 40,000 to 60,000km.

When there is a slight clogging of the car Injector, it also has a certain impact on the condition of the car. Sometimes there will be such a fault: hang a gear, start, the car some shaking, and so on hanging high gear, acceleration, such a phenomenon and disappear, assuming that the car’s various sensors work normally, the throttle valve has been cleaned, the circuit is also normal, it is likely that the injectors have a slight blockage.

Cleaning car Injectors

When do you need to clean the specific choice – how much fuel injection control: the same type of EFI car, the pressure of the gasoline pump is constant, regardless of the size of the throttle opening, as long as the fuel pressure regulator regulation, the pressure of the car injector is always constant.

The fuel injection nozzle is used in strict coordination with the fuel pump and fuel pressure regulator, only the designed pressure fuel injection nozzle to achieve the best atomization effect. The pressure is lower than the design pressure, the sprayed oil is not foggy, columnar, not suitable for mixing with air; pressure is too large, the sprayed oil is cone-shaped, but also not easy to mix, and the force of the injection is too large, a lot of fuel sprayed directly to the wall of the pipe, directly affecting the mixing ratio parameters.

There are some very good injector cleaning and testing tools available. For example, Autool’s CT150, CT160, CT180, and CT200. And MrCartool’s V308, all of which are very good products. All are similar in function, using ultrasound for cleaning and simulating real fuel injection for testing. You can watch the video below to learn more about the product and its use.


1. Blockage of the spray hole

Can be unclogged through the needle, unclogging to be carefully cleaned by latitude and longitude. Needle valve body large plane and the main plane of the car Injector poor contact, or needle valve cylindrical surface wear larger. If the needle valve body large plane and the main plane of the car Injector poor contact, available chromium oxide is coated on the flat plate for “8” grinding; if the needle valve cylindrical surface wear larger, it should be replaced in pairs needle valve coupling.

2. Poor sealing

Needle valve and needle valve body sealing are poor, resulting in poor atomization or dripping oil injection nozzle.

This failure can be fine chrome oxide or toothpaste coated in the needle valve end of the seat belt but does not apply to the cylindrical part. Then, insert the needle valve into the needle valve body while knocking turning until tight. The abrasive stone must be washed away with chromium oxide or toothpaste.

3. There is air in the oil circuit

There is air in the oil circuit. Simply remove the air from the oil circuit.

4. Oil supply is not normal

The oil delivery pump needs to be overhauled. If there is air leakage from the oil delivery pipe joint, try to connect it so that it does not leak.

5. Insufficient elasticity

The piston spring has insufficient spring force or has broken, and the spring should be replaced.

6. Piston wear

Piston wear affects oil supply. Then the piston should be replaced.

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