hy everyone,I have a BMW 520d se,recently changed turbo(oil,oil filter) myself(138k),the problem is now that when is in the 1st,2nd gear turbo does not kick,but if I keep the pedal down longer (I mean accelerating longer in 1st,2nd gear-maybe 30-40 m)than suddenly goes it powerfull,tried to change MAF,no result,so I do not know where from is coming this DELAY,I am really afraid to go on a BMW service because I heard they are very expensive,so please if someone can help me!!