Why is my Audi 80 engine making strange noises while idling?

I recently noticed that my Audi 80's engine is making odd noises when idling. It sounds like a rattling or grinding noise. What could be the cause of this and how can I fix it?

It is possible that the noise is coming from a faulty or worn out belt in your engine. Have a mechanic check and replace the belt if necessary.

Another possible cause could be a loose or damaged pulley, which can cause the belt to slip and make noise. Again, have a mechanic check and replace the pulley if needed.