hi there Fanie ,if you look on top of your tappet cover by the injectors there is a black oval shape box.if you open this you will see a filter ..it tends to clog with oil and ,,,,,,no power or lack of power with lots of smoke ,,,that happened to my td4 cleaned filter and bobs your uncle problem solved ..also check you fuel injectors if clogged/seized it will do the same .my td4 is now a crank no start due to fine metal from pumps that packed up and clogged the injectors ,
sterkte waar in SA bly jy ..ek is in Robertson weskaap