The engine got sand, and now it's loud. What should I do?

First, generally speaking, sand can't enter the engine. There are two possibilities. 1 The oil change is not standard. 2. The pipeline connecting the air filter and the intake branch pipe leaks or breaks. Maybe it's carbon deposition.

Second, really getting dust from the throttle won't make the engine hang up. If you change the oil, you should observe the oil consumption more and shorten the oil change cycle. Qualified mechanical filtration can filter out most particles.

Third, if the engine really has sand, you can't change the oil just because the sand is heavy. You need to remove the oil pan for cleaning, and then clean the inside with cleaning oil. Remember to repeat it several times to minimize the loss. Look at the oil. No, if it doesn't work, we must take apart the cylinder.