old pal

the trouble is this car is my baby , when i changed the turbo`s i had loads of old blue smoke once that cleared the engine was ok then the smoking began white ish smoke , rev it up and it bellows out then it clears , i have just taken out the ps valves again they ain`t blocked , i just wondered if there is somert else i can nosey at before isa tax it next month then isa can give it a blast its just crap cause these cars are so spot one

isa had me zed for 5 years , love me car to bits but i cannot get rid of smoking on tickover , now when ryan was down at swindon he checked it out he could not find a fault, , isa had new turbo`s ps valves , 3 years ago and i only use me z in the summer,probably only do 1500 miles a year it mainly smokes when cold but also when warm , i dread taken the car for mot any ideas isa stuck