I've spent some time tweaking the pump of my 90 200 tdi, after some playing the engine pulls well and there is almost no smoke even at full throttle.
What i've done is basically add some fuel with the smoke screw (2 turns CW), 1/4 CW for the star wheel and 1/4 CW for the diaphragm.
The engine now is very smooth and it gained some power, but I've noticed that some engine braking as been lost, like if the throttle never fully close, but I've checked the cable and it is fine.
The only thing is that the idle is a little high, around 900 rpm when the engine is hot, but was that way even before I started playing with the fuel pump.
So, what I've to do to get back my engine braking? Should adjust the idle or should i try to decrease the fuel with the smoke screw?
many thanks