Nuevo on Boxer

Our new (to us) 2008 Nuevo has developed a whistling from the engine while we were away last week
It's not there at start up but soon is and stays while engine is running
There is no loss of power
Anyone any ideas please

Turbo whistle is a possibility

That’s very likely.

Depends which engine you have.
My 2002 Exec has the Peugeot 2.8Hdi 128Bhp.
My turbo is audible, apart from idle or a little more. it is just the other side of the bulkhead from where the gear linkage exits the cab.
Personally I like to hear it, means the bl88dy thing is still working!

I'm pretty sure it's not turbo whistle and it wasn't there when we first got the vehicle
It's there all the time when idling or reving and doesn't really change with revs

Have you checked all the vacume hoses are connected and non are split

That's what I was thinking Chris, there may be a split hose.

Thanks guys
I'll have a look at the weekend