噴油嘴本身是一個常閉閥(常閉閥的意思是當沒有輸入控制訊號時，閥門一直處于關閉狀態)，由一個閥針上下運動來控制閥的開閉。當電腦下達噴油指令時，其電壓訊號會使電流流經噴油嘴內的線圈，產生磁場來把閥針吸起，讓閥門開啟好使油料能自噴油孔噴出。噴射供油的優點就是燃油供給之控制十分精 確，讓引擎在任何狀態下都能有正確的空燃比，不僅讓引擎保持運轉順暢，其廢氣也能合乎環保法規的規范。
The fuel injection nozzle itself is a normally closed valve (normally closed valve means that the valve is always closed when no control signal is input), and a valve needle moves up and down to control the opening and closing of the valve. When the computer gives the fuel injection command, its voltage signal will make the current flow through the coil in the fuel injection nozzle, generate a magnetic field to suck up the valve needle and open the valve so that the oil can be ejected from the fuel injection hole. The advantage of fuel injection is that the control of fuel supply is very accurate, so that the engine can have the correct air-fuel ratio in any state, not only keep the engine running smoothly, but also its exhaust gas can meet the specifications of environmental protection regulations.

噴油嘴是發動機的重要部分，它的工作好壞將嚴重的影響發動機的性能。噴油嘴堵塞會嚴重影響汽車性能。
Fuel injection nozzle is an important part of the engine. Its work will seriously affect the performance of the engine. Fuel injection nozzle blockage will seriously affect vehicle performance.
堵塞的原因：1、由于發動機內積炭沉積。2、由于燃油中的雜質。
Causes of blockage: 1. Due to carbon deposition in the engine. 2. Due to impurities in the fuel.
噴油嘴的工作好壞，對每臺發動機的功率發揮起著根本性作用。由于燃油不佳導致噴油嘴工作不靈，使缸內積炭嚴重；缸筒、活塞環加速磨損，造成怠速不穩，油耗上升，加速無力，起動困難及排放超標，嚴重的會徹 底堵塞噴油嘴，損壞發動機。因此，要定時清洗噴油嘴。
The work of fuel injection nozzle plays a fundamental role in the power of each engine. Poor fuel causes the fuel injection nozzle to work improperly, resulting in serious carbon deposition in the cylinder; The accelerated wear of cylinder barrel and piston ring will cause unstable idle speed, increased fuel consumption, weak acceleration, difficult starting and excessive emission. In serious cases, the fuel injection nozzle will be completely blocked and the engine will be damaged. Therefore, clean the fuel injection nozzle regularly.
在日常行駛中，應該經常跑一跑高速，這樣可以減少積炭行成的可能性。如果長期不清洗噴油嘴，噴油嘴會堵塞而且會越來越嚴重，從而引起發動機噴油不暢，噴油角度和霧化不好，導致發動機怠速，加速或全負荷工況時工作不好，使得發動機功率下降，油耗上升，排放污染增加，甚至使發動機無法工作。所以，車主朋友們一定要定期清洗噴油嘴，以確保其正常工作。
In daily driving, you should often run at a high speed, which can reduce the possibility of carbon deposition. If the fuel injection nozzle is not cleaned for a long time, the fuel injection nozzle will be blocked and become more and more serious, resulting in poor fuel injection, poor fuel injection angle and atomization of the engine, resulting in poor operation of the engine under idle speed, acceleration or full load conditions, reducing engine power, increasing fuel consumption, increasing emission pollution, and even making the engine unable to work. Therefore, car owners and friends must clean the fuel injection nozzle regularly to ensure its normal operation.
車主朋友們，清洗噴油嘴不代表經常清洗就好。因為噴油嘴本身在發動機里邊，經常拆裝會磨損相關部件，甚至會使膠圈之類的易損件壞掉，所以我們要按規定（建議4-6萬公里，或是用電腦檢測有故障時）清洗。清洗時一定要到正規修車店清洗。
Owners friends, cleaning the fuel injection nozzle does not mean that it is good to clean it often. Because the fuel injection nozzle itself is inside the engine, frequent disassembly and assembly will wear relevant parts and even damage vulnerable parts such as rubber rings, so we should clean it according to the regulations (it is recommended to drive 40000-60000 kilometers, or when there is a fault detected by computer). When cleaning, be sure to go to a regular garage for cleaning.