Why is my Ford Mondeo's engine making a strange noise?

Recently, my Ford Mondeo's engine started making a strange noise that I haven't heard before. It only happens when the engine is running and gets louder as I accelerate. Any idea what could be causing this?

Based on your description, it sounds like your engine might be experiencing a misfire. This could be caused by a variety of reasons such as a faulty spark plug or a clogged fuel injector. I would recommend taking your car to a mechanic for a diagnostic test to properly identify and fix the issue.

I had a similar issue with my Ford Mondeo and it turned out to be a loose belt in the engine. I would suggest checking your belts to see if any of them are loose and tightening them if necessary.