What Causes Engine Knocking Sound When the Fuel Injector is Faulty?

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If it's a diesel electronic fuel injector, the issue could be excessive single-cylinder fuel injection or premature fuel injection. It's recommended to calibrate the pre-injection quantity and mid-speed fuel quantity (emission point) for both old and new injectors. Excessive deviation in idle fuel quantity can also cause engine knocking. More relevant information is as follows: 1. Cleaning: Fuel injectors should generally be cleaned every 2 years or 50,000 to 80,000 kilometers, depending on the fuel quality in the vehicle's operating region. The cleaning methods for fuel injectors are: cleaning without disassembly; cleaning with disassembly. 2. Note: Cleaning the engine's fuel injectors is essential, as the performance of the injectors fundamentally affects the power output of each engine. Poor fuel quality can lead to injector malfunction, causing severe carbon buildup in the cylinders, accelerated wear of cylinder liners and piston rings, resulting in unstable idling, increased fuel consumption, lack of acceleration power, difficulty starting, and excessive emissions. In severe cases, it can completely clog the fuel injectors and damage the engine.