What could be causing the engine to make a clicking noise in my Audi 80?

I've noticed a clicking noise coming from my engine while driving my Audi 80. What could be causing this and how do I fix it?

It's possible that the clicking noise could be coming from a loose valve lifter. I recommend checking the valve clearances and adjusting them if necessary.

Another possibility is that the engine oil is low or old, causing improper lubrication. Try changing the oil and see if that solves the issue.

If the clicking noise only occurs when the car is cold, it could be a sign of a worn timing belt. I suggest having the timing belt inspected and replaced if needed.