Regarding my father's 2003 Fiesta 1.4 Zetec (new shape).
I noticed the other day with the car idling at standstill, when reved up towards 2500 - 3000 rpm there is a loud resonance from underneath the bonnet, similar to a plastic panel vibrating.
It goes as the revs climb but you can hear it again as the revs drop throught the 'zone' to idle speed.
I wondered if it was anything to do with the air cleaner housing, or perhaps an engine mounting issue? Something is certainly vibrating at a certain engine speed. It did not sound like a rattle caused by exhaust heat shields.
Any suggestions would be of help, I will carry out a visual check first for obvious issues such as engine under tray.
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