What are the symptoms of a leaking fuel injector seal?

[VanTimothy]

Poor sealing between the needle valve and the needle valve body, resulting in poor atomization or dripping of the fuel injector, can cause insufficient engine power, difficulty starting when the engine is hot, increased fuel consumption, and generally carbon deposits inside the injector preventing it from closing properly. Cleaning with a carbon deposit cleaner can resolve the issue. Relevant information about fuel injectors is as follows: 1. Introduction: The fuel injector itself is a normally closed valve (a normally closed valve means that when there is no control signal input, the valve remains closed; whereas a normally open valve remains open when there is no control signal input), with the opening and closing of the valve controlled by the up and down movement of a valve needle. 2. Working Principle: The fuel injectors used in modern cars are essentially simple solenoid valves. When the electromagnetic coil is energized, it generates a magnetic force that lifts the needle valve, opening 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.