How to deal with the noise of automobile engine?

There are two basic causes of engine noise:

1. When the engine valve has too much carbon deposit or the timing is not adjusted properly, the engine will have a "poop-poop" sound. At this time, it is necessary to clean up the carbon deposit on the valve and adjust the valve timing.

2. Improper use or uncleanness of engine oil will cause friction and noise when the engine is running. Faced with this situation, it is necessary to change the oil.

3. When the engine belt is not tight enough, the engine will produce squeaky sharp noise when working. Faced with this situation, it is necessary to adjust the tightness of the engine belt.

4. Air leaks from the intake and exhaust pipes. When the engine is started, gas will leak from the leaking place, resulting in vibration and noise. Faced with this situation, it is necessary to check the intake and exhaust pipes and replace them in time.

5. When using inferior fuel, the combustion situation in the engine will get worse, resulting in noise. Faced with this situation, replacing fuel with better quality and higher label can prevent noise.