Why does my Audi 80 engine make rattling noises when I accelerate?

I have noticed that when I accelerate in my Audi 80, the engine starts making a loud rattling noise. It's almost like a metal-on-metal sound. What could be causing this and what should I do?

The most likely cause of this rattling noise is a faulty exhaust manifold. It could be rusted, cracked, or have loose bolts causing it to vibrate when the engine is under load. It's important to get this fixed as soon as possible, as it can lead to bigger and more expensive problems down the line.

Another possibility is that your engine's timing is off, which can also cause rattling noises. This could be due to worn timing belts, tensioners, or even spark plugs. I recommend taking your car to a trusted mechanic to have them check and replace any worn components.

If you've recently changed your oil, it's possible that the wrong type or viscosity was used, causing the engine to make strange noises. Make sure to use the recommended oil for your Audi 80 and change it regularly to prevent any potential issues.