Hi chaps,
Mum's '00 HDi (110BHp, in a cit. Xantia, so technically OT :-) has started making a loud whistling noise. When she mentioned it, I thought it must be a hole in the exhaust before the silencer, but when I went over and had a listen it turns out to be _much_ louder than that.
Sound comes from front (i.e. engine bay...), is definitely turbo related, sounds like one of those whistles you get in christmas crackers (! technical jargon !) starts at ~1400rpm. My thinking is that it could be a leak in the intake plumbing somewhere in the turbo-intercooler-inlet manifold bit, a leak in the manifold itself, or knackered turbo.
If anyone can suggest other possible causes, I'd be glad to hear.
Many thanks!