What is the reason for the abnormal sound of Changan Yidong engine?

The reasons for the abnormal sound of the Changan Yidong engine are: the abnormal sound of the engine lacking cylinder; .

When the engine lacks cylinders, there must be one cylinder in the engine that is not working normally. When the cylinders are lacking, the exhaust pipe of the car will vibrate violently and make a "plop, plop" sound. There is abnormal noise when the engine knocks on the cylinder, usually because of poor lubrication, excessive wear of the cylinder wall and piston, and the collision between the engine and the abnormal noise when the engine is running. When the rubber feet of the machine are aged or loosened, the engine will vibrate, resulting in abnormal noise. When the engine mixture is too rich, the engine will not start easily, resulting in abnormal noise. After the timing gear has been used for a long time, it will wear out, and it will produce abnormal noise when the machine is started.