What should I pay attention to when the cleaning nozzle fails?

As one of the key components of EFI engine, the performance of injector will be seriously affected. Nozzle blockage will seriously affect the performance of the car. The reason for the blockage is that carbon deposits in the engine are deposited on the fuel nozzle or impurities in the fuel block the fuel nozzle channel. After the car runs for a period of time, the fuel system will form certain deposits. When the injector is slightly blocked, it also has a certain impact on the vehicle condition. Sometimes, there will be such a fault: the car is a little shaky when it starts in first gear, and it disappears when it accelerates in high gear. Assuming that all kinds of sensors on the car are working normally, the throttle is clean and the circuit is normal, it is likely that the fuel injector is slightly blocked. However, when accelerating in high gear, slight gum may be sprayed away (dissolved) again, and the performance of the car will be restored. This slight blockage of the fuel nozzle can usually be avoided. Because slight gum can be dissolved. Therefore, in daily driving, you should always run at high speed to reduce the possibility of carbon deposition.

The injector is divided into front and rear parts, and the front and rear parts are a riveted whole. The back end is engineering plastic, the front end is metal nozzle and the inside is electromagnetic needle valve. The electromagnetic needle valve is usually closed, blocking the oil path to the nozzle. When receiving the driving pulse from ECU, the needle valve is pulled up by electromagnet to open the oil path, so that the high-pressure oil provided by the oil pump is sprayed from the nozzle. To put it bluntly, cleaning is to simulate ECU to give the nozzle a constant drive to make it open for a long time, and then use mixed oil with cleaning ability to clean the nozzle at high pressure before and after.

There are two dangers. First, the ECU gives pulses, with cooling time in the middle, but the constant drive does not. Therefore, the current requirements are extremely strict to prevent overheating and burning. Because the coil is short-circuited in DC equivalent, it is only a matter of time before the working current can not be strictly controlled. Second, what is the essence of blocking? Some plugs and cleaning agents are natural abrasives, which do great harm to nozzle micropores. Although cleaned, the physical parameters of micropores have also changed, which is inevitable.