my mate has a s reg 90 bhp tdi galaxy, it is a pig to start, just had new heater plugs fitted, but had major problems today was driving along and had a massive loss of power with loads of the white smoke coming out of exhaust, if he dropped a gear and floored it it would drive normal untill he took foot off acelerator then no power and loads of smoke, when he loses power he said was some funny noises coming from engine, possibly turbo. any ideas what this could be, im thinking may be crank pulley has corroded and is slipping under engine load