What causes the BMW 5 Series to shake at idle when the air conditioning is on?

[DiSophie]

BMW 5 Series shaking at idle when the air conditioning is on can be caused by excessive engine carbon deposits, throttle carbon buildup, or issues with the air conditioning system. Excessive engine carbon deposits: When there is severe carbon buildup in the engine, the gasoline sprayed by the cold-start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes cold starts more difficult and leads to significant shaking. Throttle carbon buildup: The proper functioning of the throttle directly affects the engine's performance. During vehicle operation, carbon deposits can accumulate in the throttle. Excessive carbon buildup can obstruct normal air intake into the engine, reducing engine power. This makes it difficult for the engine to drive the compressor or barely manage to do so. Air conditioning issues: Whether the air conditioning radiator is functioning properly can also affect the occurrence of idle shaking when the air conditioning is turned on.