Now many automotive fuel injection nozzles are relatively simple, which is a solenoid valve. When the solenoid valve is energized, it will generate suction. After the needle valve is sucked up, the nozzle is opened, and the fuel will be fully burned. In the past, the fuel injection nozzle of diesel engine was mechanically controlled, and the nozzle of gasoline engine is a part of the electronic control system of gasoline engine. Then the key of EFI engine is the fuel injection nozzle, which affects the performance of the engine, and the common fault of fuel injection nozzle is the blockage of fuel injection nozzle.
How to judge whether the fuel injection nozzle is dirty? When the fuel injection nozzle is dirty, the car will show the following obvious performance:
1. The engine noise becomes louder, especially in low gear;
2. The accelerator response is not sensitive and the driving is not smooth. I feel a lag after stepping on the accelerator. After stepping on the accelerator in neutral gear, the engine speed rises slowly;
3. Idle speed jitter, especially when starting, is easy to jitter. There is slight cylinder shortage in low gear and low speed upshift.
How often are the fuel injection nozzles cleaned? Generally speaking, if the vehicle condition is good and the oil quality is good, it can be carried out every 40000-60000 kilometers. Even if the fuel injection nozzle is slightly blocked, don't be too nervous, because impurities can be sprayed away and dissolved when accelerating in high gear. This is why it is recommended that car owners should often run at a high speed when driving daily, so as to reduce the possibility of carbon deposition. Some car owners are more concerned about the fuel injection nozzle. They clean the fuel injection nozzle as soon as they feel that the power is weak. In fact, the fuel injection nozzle is not a consumable part and does not need to be cleaned frequently. Excessive cleaning leads to the early scrapping of the fuel injection nozzle.
How much is the nozzle cleaning? If you go to the 4S store, they generally recommend you to do a full set, that is, car oil circuit cleaning. Basically, you use the method of hanging a bottle, hang a bottle tool above the engine, then pour the detergent into the bottle tool, and guide it into the engine through a conduit to clean the carbon deposit. The price is about 1000 yuan, and the price is only for reference. If the outside maintenance shop cleans the fuel injection nozzle separately, the price will be much cheaper, generally about 200-300 yuan.