What is the situation when a car starts with a knocking sound?
1 Answers
Car starting with a knocking sound is due to carbon deposits on the top of the piston. Precautions before starting the car are as follows: 1. Vehicle cleaning: In winter, use warm water to clean the vehicle, not cold water directly. Especially after the engine warms up, cold water cleaning will rapidly cool it down, causing the paint on the hood surface to crack. After rinsing, promptly open the car door to dry the water marks to prevent water from freezing in the door gaps and freezing the door. Do not force open or close the window if it is frozen. Additionally, snow often falls in winter, and cleaning the car surface after snow is crucial. Because snow water contains acidic and corrosive substances that can damage the car paint and cause premature rust, it is necessary to clean it in time. 2. Vehicle waxing and coating: Before winter, it is best to add a layer of protective film to your car. Car paint coatings containing Teflon polymer or mirror glaze can resist the erosion of acid rain and fog, and the body is less likely to get wet, reducing the possibility of freezing. 3. Tire maintenance: Rubber becomes hard and relatively brittle in winter, and the friction coefficient of tires decreases, making them more prone to leaks and punctures. Therefore, tire pressure should not be too high, but even more importantly, not too low. If the tire pressure is too low and the external temperature is low, soft tires can accelerate aging severely.
