What are the symptoms of dirty fuel injectors?

[LaVincent]

Symptoms of dirty fuel injectors include: increased engine noise, unresponsive throttle, uneven acceleration, and minor idle vibration. The cleaning method for fuel injectors is: 1. Hang the cleaning device on the front hood of the car; 2. Locate the engine's fuel supply and return lines; 3. Disconnect the return line from the engine and use an appropriate plug to block the return line; 4. Connect the fuel supply line to the outlet of the cleaning device; 5. Open the fuel tank cap and remove the fuel pump fuse to stop the fuel pump operation, completing the process. The fuel injector is located on the intake manifold or directly on the cylinder for direct injection engines. The fuel injector is a simple solenoid valve. Its working principle is: when the solenoid coil is energized, it generates magnetic force, lifting the needle valve to open the injection port. Fuel is sprayed at high speed through the annular gap between the needle valve head and the injection port, forming a fine mist for optimal combustion.