What causes engine vibration when the Excelle's air conditioning is turned on?

[DelTanner]

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.