What causes engine vibration when the Excelle's air conditioning is turned on?
2 Answers
Engine vibration when the Excelle's air conditioning is turned on is caused by a dirty throttle body. Below are specific explanations about a dirty car throttle body: 1. Cause of vibration: When the air conditioning is turned on, the compressor also operates. Since the compressor is driven by the engine, its operation increases the engine load. This increased load requires greater throttle opening to allow more air intake. If the throttle body hasn't been maintained for a long time, carbon deposits can easily accumulate. These deposits obstruct engine air intake, making it difficult for the engine to adequately power the compressor, resulting in idle vibration. 2. Regular cleaning: If driving conditions are relatively harsh, it's advisable to clean the throttle body regularly, with a recommended interval of every 10,000 kilometers.
I've been driving my Excelle for over a decade. When the AC is on, the engine shakes like a massage chair. Common causes include: 1) The AC compressor startup creates a significant load increase, causing unstable engine RPM; 2) Worn-out spark plugs or heavy carbon buildup leading to poor ignition and vibration; 3) A dirty idle control valve or throttle body causing sluggish response and shaking. I remember one time cleaning the throttle body helped, but long-term neglect can damage engine components. Regular maintenance is advised—replace air filters and check spark plugs. If shaking persists, visit a professional shop to test the compressor and electrical systems as soon as possible.
