What are the most common issues in Audi 80's engine?

I am noticing some strange noises in my Audi 80's engine and want to know what could be causing them. Any tips or recommendations on how to deal with them would be greatly appreciated.

Timing belt failure can also occur in Audi 80's engine, resulting in engine damage. It is recommended to replace the timing belt every 60,000 miles as a preventative measure.

Bearing failure is a common issue in Audi 80's engine, which can ultimately lead to complete engine failure. It is important to regularly check and maintain proper lubrication of the engine to prevent this issue.

Another common issue is a faulty fuel pump. It is recommended to replace the fuel filter and perform a fuel pressure test to diagnose and fix this issue.