In 2002, it was difficult for Audi A6 to light a fire in the morning.

It's hard to start. Personally, I think there are the following possibilities: carbon deposition in the intake valve and throttle valve will cause insufficient cylinder pressure and make it difficult for the vehicle to start cold; When carbon deposits are attached to the intake valve and throttle valve, the engine cannot accurately control the amount of gasoline and air sent into the combustion chamber, resulting in unstable idle speed of the engine. The blockage of fuel nozzle caused by carbon deposit will affect the fuel injection quantity, and the mixture will not reach the ignition ratio, which will also make it difficult for the vehicle to start cold. In addition, if the water temperature sensor fails, it will cause the sensor to be unable to obtain an accurate temperature signal (both when the cold car starts and when the hot car starts), so that the ECU can't accurately adjust the mixture concentration according to the water temperature signal (the ECU can't get the signal to provide an excessively rich mixture, but can only supply a dilute mixture to the engine), which makes it difficult to start the cold car.

It is recommended that you go to the 4S shop in time for corresponding maintenance (cleaning the carbon deposit on the intake valve, throttle valve and fuel injector, and replacing the water temperature sensor in case of failure).