What is the reason why the idle speed of Volkswagen Tiguan is as high as 3000 rpm?

The reason why the idle speed of Volkswagen Tiguan is as high as 3000 rpm is that the throttle valve is too dirty or the nozzle has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed from the cold start nozzle will be absorbed by the carbon deposit, which will lead to the lean mixture of the engine and make it difficult to start. Only when the gasoline absorbed by carbon deposits is saturated can the car start easily. After the car starts, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will make the mixture rich and the combustible mixture of the engine dilute, resulting in idling jitter after cold start. In addition, after the air conditioner is turned on, the engine speed becomes higher, which aggravates the instability of idle speed. Million car purchase subsidy