What is causing my Audi 80's engine to make a rattling noise?

I've noticed that my Audi 80's engine has been making a rattling noise lately. It seems to happen more often when I'm accelerating. What could be causing this and is it something I should be concerned about?

It's possible that the rattling noise is due to a loose or worn out drive belt. You should have this checked by a mechanic to avoid any potential engine damage.

Another possible cause could be a problem with the timing chain tensioner. This is a common issue with the Audi 80 and can be fixed by a professional mechanic.