Ford Mondeo with engine rattle

My Mondeo has covered 114,000 miles.and had just passed its M.O.T and service, but has a rattling similar to coins shaking around in a tin can, which the garage cannot fathom out. It`s especially noticeable driving when cold and seems to come from under the bonnet somewhere, any clues?

Probably an inlet manifold swirl flap has become detached. If so, it needs fixing or removing urgently before the engine ingests it because that will wreck the engine.

Answered by Honest John on 5 August 2015