Why does my Audi 80's engine sound strange?

I have been noticing a strange noise coming from my Audi 80's engine lately. It sounds like a ticking or clicking noise. Any ideas on what could be causing this and how I can fix it?

It is possible that the noise could be caused by a faulty fuel injector. I would recommend getting it checked by a mechanic.

Another possible cause could be an issue with the camshaft or valve train. I would suggest getting a proper diagnosis from a mechanic.