What are the symptoms of a faulty Focus intake solenoid valve?

[NoahAnn]

Common symptoms of a faulty intake solenoid valve include: 1. Abnormal engine operation or insufficient power; 2. Uneven engine performance and rhythmic shaking at high, medium, and low speeds, with black smoke and backfiring from the muffler; 3. Increased fuel consumption; 4. In severe cases, the engine may fail to start. Effects on power when the intake solenoid valve is faulty: 1. Inability to accurately detect the intake air volume; 2. Difficulty starting the vehicle normally, causing engine idle vibration. Main causes of a faulty intake solenoid valve: 1. Solenoid valve malfunction itself; 2. Loose connections; 3. Open circuits in the wiring. Solutions for solenoid valve damage are as follows: 1. If the solenoid valve itself is faulty, replace it directly; 2. If there is a loose connection, simply tighten it; 3. If caused by an open circuit, repair the wiring.