What are the symptoms of fuel injector leakage?
2 Answers
The symptoms of fuel injector leakage are: 1. The engine idles unevenly; 2. Gasoline dripping into the cylinder will make the air-fuel mixture too rich, causing difficulty in engine starting; 3. Increased engine noise; 4. Unresponsive throttle and unstable 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 pressure of the adjusting spring; 2. Failure of the pressure spring, resulting in insufficient closing pressure; 3. Poor gasoline filtration. The 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.
While driving, I noticed symptoms of fuel injector leakage, typically characterized by a strong gasoline smell after starting the car, especially when parking on an incline or during engine startup. The engine runs unevenly, such as severe shaking at idle, feeling sluggish during acceleration, and difficulty starting. Fuel consumption increases noticeably, and black smoke emits from the exhaust pipe due to fuel waste and incomplete combustion caused by the leakage. The most dangerous part is seeing wet oil stains in the engine area, which poses a fire hazard over time—I once experienced a near-miss that almost sparked a small flame. To address this issue, it's best to regularly check for signs of leakage around the fuel injectors, especially in older car models. Early intervention by a repair shop can prevent bigger troubles and ensure driving safety.
