Troubleshooting engine issues in the Audi 80

My Audi 80 is making strange noises and I'm not sure what's wrong. Can you offer any advice on how to diagnose and fix this issue?

First, try to identify where the noise is coming from - is it from the engine, exhaust, or elsewhere? Then, check the oil levels and make sure they are at the correct level. You may also want to get your spark plugs checked and replaced if necessary.

It could be an issue with the timing belt or the serpentine belt. Get these checked by a mechanic as they can wear out and cause strange noises. It's better to address these issues sooner rather than later to avoid any expensive repairs.

Another thing to check is the air filter. A dirty or clogged air filter can cause strange noises and affect engine performance. You can easily replace it yourself if needed.