What to do if the car engine is knocking?

[VanVincent]

When the knocking is slight, the engine power is slightly unstable, the engine shakes severely, and it will cause the engine to overheat and emit black smoke. The solutions for car engine knocking are as follows: 1. After the engine starts, if there is a knocking sound during low-temperature operation, and the sound disappears when the temperature returns to normal, it can be left untreated temporarily and continue to run. 2. When the engine temperature is normal, if there is an obvious knocking sound, high-speed operation should be avoided as much as possible, and the engine should be disassembled and repaired as soon as possible. 3. If the cylinder is severely out-of-round, scratched, or the gap between the piston and the cylinder is too large, it should be replaced. 4. If the connecting rod is found to be deformed, it should be replaced as much as possible.