What Causes Knocking Sounds When the Fuel Injector is Faulty?

[VonJohn]

The reasons for knocking sounds when the fuel injector is faulty are as follows: If it is a diesel electronic fuel injector, it could be due to excessive single-cylinder fuel injection or advanced fuel injection timing. It is recommended to calibrate the pre-injection volume and mid-speed fuel quantity (emission point) for both old and new injectors. A significant deviation in idle fuel quantity can also cause knocking. Additional relevant information is as follows: 1. Cleaning: Fuel injectors should generally be cleaned every 2 years or every 50,000 to 80,000 kilometers, depending on the quality of gasoline in the vehicle's usage area. The cleaning methods for fuel injectors are: non-dismantling cleaning; dismantling cleaning. 2. Note: Cleaning the engine fuel injector is essential, as the performance of the injector fundamentally affects the power output of each engine. Poor fuel quality can lead to injector malfunction, causing severe carbon buildup in the cylinder, accelerated wear of the cylinder liner and piston rings, unstable idle, increased fuel consumption, weak acceleration, difficulty starting, and excessive emissions. In severe cases, the injector may become completely clogged, damaging the engine.