Hey guys , i recently bought a golf diesel and the problem with it is when i turn it on and when i rev it ( in neutral ) , black smoke comes out, now i noe that means its running to rich but im just puzzled and i cant find the air/fuel adjustment screw , can anyone please help me get it running good, thanks alot guys!

info:
1992
1.6 diesel
Golf
5-speed
Stock engine

 

check air filter and try a diesel service before finding that magic screw
a.