What symptoms occur when a car's fuel injector is faulty?

[VonDiana]

When a car's fuel injector is faulty, the following symptoms may occur: severe carbon buildup in the cylinder, accelerated wear of the cylinder liner and piston rings, leading to unstable idling, increased fuel consumption, lack of power during acceleration, difficulty starting, and excessive vehicle emissions. In severe cases, it may even damage the engine. The fuel injector is one of the key components of an electronic fuel injection engine, determining the engine's performance. The fuel injector itself is a solenoid valve. Its working principle is that when the electromagnetic coil is energized, it generates suction, lifting the needle valve to open the injection hole. Fuel is then sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a mist that facilitates complete combustion.