Hey,

First post, need some help with diagnosing a noise coming from my engine.

I've been working away from home so the car's barely been moved in 3 weeks. Just drove into town and there's a strange noise coming from under the bonnet, which got worse as I parked up and left the engine ticking over. Best way to describe it is that it sounds like a butterfly rattling around under the bonnet but it stops as soon as I turn the engine off. It sounds as if it's right behind the centre console and is really loud when I'm stopped at lights etc. It's not noticeable at 60mph but I can hear it when I'm driving around at 30 or less.

Any ideas on what it could be or advice is appreciated.

what sort of noise is it? rattle? crackle? bang? groan? whine?

The foil heat Shields make some noise when the clips holding them on give up