Why is my Ford Focus engine making a loud knocking noise?

Recently, I've been hearing a loud knocking noise coming from my Ford Focus engine. It only happens when I accelerate and it seems to be getting louder. What could be causing this and should I be concerned?

It's common for Ford Focus engines to make a knocking noise when accelerating due to a loose timing belt or worn out bearings.

I had the same problem with my Ford Focus and it turned out to be a faulty spark plug. I replaced it and the knocking noise disappeared.

It could be an issue with the valves or pistons in your engine. I suggest taking it to a mechanic to get it checked out.