What Causes Engine Shaking and Lack of Power During Acceleration?

[VonJuliette]

Engine Shaking and Lack of Power During Acceleration: Causes Throttle Body Carbon Buildup: The most common reason for engine shaking when the air conditioning is turned on is carbon buildup in the throttle body, which affects engine performance. When the air conditioning is activated, the engine load suddenly increases, and the throttle opening expands. At this point, the issue of dirt becomes more pronounced—the throttle may stick or fail to open to the proper position, restricting airflow. This reduces engine power and ultimately leads to engine shaking. Spark Plug Carbon Buildup: After prolonged use, spark plugs accumulate carbon deposits. If not cleaned in time, this can reduce engine torque output, causing shaking when the air conditioning is turned on. To clean them, soak the spark plugs in a container filled with white vinegar for 2-3 hours (or 4-5 hours for severe buildup). Then, use a stiff-bristle brush to scrub off the carbon deposits. Rinse them with gasoline, let them air-dry naturally for some time, and they will be ready for reuse.