What causes engine shaking in Audi A6?

[DelAubrey]

A major reason for significant engine shaking when the air conditioning is turned on in an Audi A6 is severe engine carbon buildup. There are three key points for engine maintenance: Clean the air filter: The air filter is crucial for engine air intake during driving. If the air filter is clogged or excessively dirty, it can obstruct engine air intake, allowing large amounts of dust to enter the cylinders. This accelerates carbon buildup in the cylinders, leading to poor engine ignition, insufficient power, and naturally increased fuel consumption. Remove throttle valve sludge: Sludge forms due to carbon deposits from fuel combustion exhaust accumulating on the throttle valve, along with impurities not filtered by the air filter. Excessive sludge can cause air intake resistance, leading to increased fuel consumption. Clean injector carbon deposits: The combustion chamber is prone to carbon buildup, which can make starting difficult. Carbon deposits on the injectors can also block fuel passages, distort fuel injection, and impair atomization, naturally increasing fuel consumption.