How to Tell if the Fuel Injector is Faulty?

1 Answers
LePatrick
07/29/25 11:18am
Signs of a faulty fuel injector: 1. Black smoke from the exhaust pipe; 2. Uneven operation of cylinders; 3. Noticeable engine vibration; 4. Decreased engine power; 5. Weak vehicle performance; 6. Unstable idle speed; 7. Increased fuel consumption, poor acceleration, difficulty starting, excessive vehicle emissions, and in severe cases, engine damage. The fuel injector is essentially an electromagnetic valve, with its nozzle facing the intake valve and its tail connected to the fuel distribution pipe. When the engine ECU sends a fuel injection command in the form of an electrical pulse, the electromagnetic coil inside the injector is energized to create a magnetic field, opening the injection hole to spray fuel into the engine. When the ECU's injection command ends, the injection hole closes under the action of the reset spring, and the injection process stops immediately. The duration of the injection hole opening (i.e., the amount of fuel injected) is determined by the width of the electrical pulse sent by the ECU.
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