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Why is the BMW M9 engine making a rattling noise?

I recently noticed that my BMW M9 engine has started making a rattling noise. It's not a constant noise and only occurs when the engine is idling. What could be causing this issue and how can I fix it?

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Answers (2)

J

It is possible that the rattling noise is coming from a loose accessory belt. You can check this by inspecting the belt for any signs of wear or looseness. If necessary, you can tighten the belt or have it replaced.

C

Another potential cause could be a problem with the engine's timing chain or tensioner. This could be due to normal wear and tear or a faulty part. It's important to have this checked and repaired by a professional mechanic to avoid any further damage to your engine.

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