The fuel injector fault light symbol appears due to prolonged idling operation, delayed fuel injection timing, and unclean fuel containing small particulate impurities. The specific manifestations of fuel injector faults are as follows: Prolonged idling operation: During extended idling of diesel engines, the low temperature in the cylinders leads to incomplete fuel combustion. Carbon deposits easily form in the combustion chamber and on the injectors, worsening the injector's working conditions. This is particularly severe in cold winter conditions. Carbon deposits in the combustion chamber slow heat dissipation and, in severe cases, can block the injector nozzles or cause fuel dripping. Prolonged fuel attachment to the injector head can cause localized high temperatures, melting the injector and its heat shield. Delayed fuel injection timing: A small injection advance angle delays fuel injection, worsening combustion conditions. If not adjusted promptly, localized high temperatures can melt the injector and heat shield. Unclean fuel: Small particulate impurities in the fuel can wear the injector's needle valve and valve body, and in severe cases, cause the needle valve to stick. A stuck needle valve prevents timely, precise, and rapid fuel injection into the combustion chamber, leading to dripping or erratic fuel spray. Poor fuel atomization, reduced combustion speed, and prolonged combustion at the injector can ultimately melt the injector and heat shield. These faults are often accompanied by black smoke emission and engine vibration. The inspection and repair methods for fuel injector faults are as follows: First, identify the source of the fault. Inspect the injector power circuit, the wiring from the injector to the ECU, and check for abnormal fuel injection control functions in the ECU.
