172 buzzing sound (engine)

[Benbosh]

Hi all, When i start my 172 cup it emits a buzzing sound from the engine bay really wierd? when i drive it and stop the buzzing ceases? any ideas?

 

[davebem]

Can you detect where abouts from the engine its coming from?

 

[DrR]

they all do it, it's the throttle body.

 

[Benbosh]

Oh right nothing to worry about then?