What Causes the Unstable Idle Speed Fluctuation When the Air Conditioner is On in a Focus?
1 Answers
The unstable idle speed when the air conditioner is on in a Focus is caused by oil accumulation and carbon deposits in the throttle body. If there is oil or carbon buildup in the throttle body, it is necessary to promptly visit a 4S shop or repair shop to clean the throttle body. Below are the relevant details: 1. Specific Causes: A clogged intake tract can lead to idle speed fluctuations, and carbon deposits or oil in the throttle body are the most common causes of unstable idle speed. Carbon deposits in the throttle body affect its opening, which in turn affects the air intake volume, causing the engine speed to fluctuate erratically after a cold start, accompanied by strong vibrations. 2. Precautions: Severe oil accumulation or carbon deposits in the throttle body, including a dirty intake tract, can make it difficult to start the car in cold weather. A dirty throttle body requires cleaning, which is considered a routine maintenance task. Spark plugs can also accumulate carbon deposits, and cleaning can restore their activity. However, some spark plugs may lose performance as they near the end of their service life. Weak sparks from spark plugs in certain cylinders can affect the car's performance. Generally, faulty spark plugs can cause the car to exhibit "misfire" symptoms.