Why does my Kia Rio's engine make a knocking sound?

I've noticed that my Kia Rio's engine makes a knocking sound when I start it up in the morning. It goes away after a few minutes, but it's concerning. Is this something I should be worried about?

The knocking sound you hear is most likely due to air in your engine's fuel system. This can happen when your Kia Rio sits idle for a long period of time. To fix this, try starting your car and letting it idle for a few minutes before driving. If the sound persists, you may need to have a mechanic take a look.

Another possible cause of the knocking sound could be low oil levels or dirty oil. Make sure to check your oil levels regularly and get an oil change every few months. This can help prevent engine knocking and keep your Kia Rio running smoothly.

If the knocking sound only occurs when you accelerate, it could be a sign of a worn out or damaged engine belt. You may need to have it replaced by a professional to avoid any potential damage to your engine.