Why is my Audi 80 engine making a knocking noise?

I have noticed that my Audi 80 engine is making a loud knocking noise while idling. It seems to get worse when I accelerate. What could be causing this and how can I fix it?

It is likely that there is an issue with your engine's valves. This can be caused by wear and tear or a lack of proper lubrication. It is important to have this checked and fixed by a professional mechanic to avoid further damage to your engine.

Another possible cause could be a faulty connecting rod bearings. This is a more serious issue and should be addressed immediately to prevent engine failure. I recommend taking your car to a reputable mechanic and mentioning this as a possible cause.