I have what sounds like a big problem which I think may be Turbo bearings, here are the symptoms - Everything fine when cold, engine idles and revs fine with no noises.
When she gets warm I get a horrible screeching noise at idle and on the move when taking my foot off the gas, under load she is fine.
No appreciable loss of power but idle RPM rises to around 1400 and hunts
Cant really pinpoint the noise, I am guessing its Turbo related with the change in RPM, but reading around most failures seem to result in noise when revving the engine not when off throttle, engine management light comes on when the noise is there but does go off when starting from cold
Any ideas? car has been regularly serviced with an Oil change in March
Any help would be appreciated