What are the causes of engine knocking sound?

[DeValentina]

Engine knocking sound is caused by: 1. Bent or twisted deformation of engine connecting rod; 2. Excessive carbon deposits in the engine; 3. Poor engine lubrication conditions; 4. High cylinder pressure at high speed. Solutions for engine knocking sound: 1. If the knocking sound disappears after the car starts and the temperature rises, you can continue driving; 2. If the knocking sound does not disappear after the engine temperature normalizes, the owner should stop and inspect in time to prevent traffic accidents; 3. After removing the cylinder head and extracting the piston, if severe cylinder ovality, scratches, or excessive clearance between piston and cylinder are found, replacement should be performed, including cylinder liner, piston and piston rings; 4. If connecting rod deformation is found, replacement should be prioritized.