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What are the common causes of engine knocking in a 1990 Audi 80?

I have a 1990 Audi 80 and I have been noticing a loud knocking noise coming from my engine. What could be causing this and how can I fix it?

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One potential cause of engine knocking in a 1990 Audi 80 could be a buildup of carbon deposits on the fuel injectors. In this case, it is recommended to use a fuel injector cleaner to remove the deposits and improve engine performance.

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