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?
ReplyIt 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.
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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