Why does a gasoline engine produce knocking?
1. The knocking will suddenly generate a shock wave in the cylinder and impact on all sides, causing strong vibration of the piston, cylinder wall, connecting rod and crankshaft of the engine, and irregular metal knocking sounds;
2. The cooling system temperature is too high;
3. The fuel is not completely burned, and there is black smoke in the exhaust gas;
4. The engine power is reduced and the fuel consumption is increased.