Right guys, after being away for several years, im back in a mk4! Picked up a 03 gt tdi today 150, in pretty good shape, with close to full history. Was all excited until....
When driving there is a loud whistle, I wouldn't say its your normal turbo whistle, in the past I had a 1.8T and it come with a forge dump valve, now it sounds a lot like a electronic dump valve. From what I can tell the car drives fine, boosts fine, pulls well, but it seems like the turbo is kicking in high up the rev range, but the noise is there instant, just with a tap of the accelerator.
Also when on stand still the revs stay on idle under the 1000 mark, then they will raise to 1200 and stay there until i press the accelerator and they will go down again slowly.
Its been on VCDS and:-
Engine faults:
17664 - Engine Coolant Temp Sensor (G62)
17965 - Charge Pressure Control - P1557 - 35 - 10 Positive deviation - Intermittent.
Any advise would be greatly appreciated.