What Causes Vehicle Shaking During Idle?

[DerekLynn]

Vehicle shaking during idle can be attributed to the following specific reasons: Dirty Throttle Body: When the car is started, the engine operates at idle speed, requiring continuous airflow through the throttle body into the cylinders for combustion with gasoline. If the throttle valve is excessively dirty, it reduces the intake air volume in the intake pipe. When this air volume fails to meet the normal air-fuel ratio, it results in engine shaking. Excessive Internal Carbon Buildup in the Engine: Prolonged use of the engine can lead to excessive carbon buildup inside, causing engine shaking. The internal working environment of an engine is extremely harsh during operation. Over years of accumulation, carbon deposits continuously surround the intake valve ports. Over time, this can cause the valves to not seal properly, and in severe cases, lead to engine shaking. In such situations, it is necessary to remove the intake manifold and clean the carbon deposits around the valves.