I have a Fiesta 1.4tdci 2006 which gets a whine from the engine at 2000 to 2500 revs in any gear. It stops when you slow down, speed up or depress the clutch to drop the revs. The noise is also there when in neutral, clutch up and the engine is reved to 2000/2500. The turbo has been replaced by my local dealer but the noise was there before the new turbo was fitted and still remains? 46000 miles on the clock. any ideas?