Why is my Audi 80's engine producing loud knocking noises?

I have noticed that my Audi 80's engine is making loud knocking noises while idling or accelerating. What could be the cause of this issue and how can it be resolved?

The most common cause of engine knocking noises in an Audi 80 is a problem with the fuel system. This could be due to clogs in the fuel filter or fuel injectors. It is important to have the fuel system checked and cleaned regularly to prevent further damage to the engine.

Another possible cause of engine knocking noises in an Audi 80 is low engine oil levels. When the oil levels are too low, the engine components do not receive proper lubrication, leading to knocking noises. Check the oil levels regularly and top up as needed.