What are the symptoms of a leaking fuel injector?

[BellaLee]

Symptoms of a leaking fuel injector include: 1. Engine idle instability; 2. Gasoline dripping into the cylinder can cause the mixture to become too rich, making the engine difficult to start; 3. Increased engine noise; 4. Unresponsive throttle and uneven acceleration; 5. Black smoke from the exhaust pipe and accelerated wear of piston rings. The causes of fuel injector leakage are: 1. Incomplete contact between the injector hole and the needle valve under the action of the pressure-regulating spring; 2. Failure of the pressure-regulating spring, resulting in insufficient closing pressure; 3. Poor gasoline filtration. A fuel injector is an electromagnetic valve that controls the formation of fuel spray entering the engine by opening and closing, which helps the fuel burn more completely.