After mazda 6 inserted the key to start the car, the sound of the car was abnormal, and the sound of starting the car was like the sound of a sports car! Excuse me, why

The clicking sound at idle speed is generally the sound from the fuel injector, which should be normal. Of course, it is not excluded that the valve has this sound. Suggest going to the 4S shop to check it out. If it is the sound of the valve door, it should be repaired. At present, it is easy to form carbon deposits when high-speed engines drive at low speed for a long time or shift gears at low speed, which will cause premature wear of the engine, and the vehicle will shake when shifting gears, which will do some damage to the clutch system. The correct way is to shift to the last gear at 2500 rpm. In practice, you may find the engine loud and uncomfortable, but for your car, you must do so (at least not less than 2000 rpm). In addition, when your new car is running in, the cold car should be warmed up for 2-3 minutes before it can start, and then slowly drive until the water temperature rises (about 2 kilometers). The maximum speed shall not exceed 65,438+000 kilometers per hour to avoid sudden acceleration.