My Mk6 1.4 Fiesta makes this weird noise at idle, but only after the engines warmed up (2 or more miles of driving).
Pushing the clutch in has no effect on the noise, but it does go away as soon as I give it a bit of gas and comes back again once the revs drop below 1k.
Its sort of like a low pitch 'brrrrrrrr', if that makes sense.
I can only really hear it when I'm in the car, but I'm not sure where its coming from.
I recorded a video of it to show what I mean.
Anyone know what it might be?