I have a 1998 Audi 1.9 Tdi with 98000 miles on the clock, at around 2000-2300 rpm the car produces a hell of alot of black smoke. If I then apply full throttle and accelerate it stops smoking?
At around this rpm the engine is very lumpy, and basically hits a noticable flat spot briefly with acceleration.
I've used the vag-com diagnostic software on it whilst driving but cant see any problems?
I've recently had a new MAF fitted and also the cam belt, pulley, and tensioner fitted, along with a fuel cut-off solenoid.
Has anyone have any ideas on whats up?