I have a 163hp XC90 D5. I've noticed lots of black smoke under hard acceleration very similar to an issue 'Caius Jard' had;
"there's a periodic hesitation in the power delivery - again going up that hill in 3rd at about 2000 rpm, the power surges on and off slightly, every second or so. Generally the power delivery is poorer than it was, with the car sounding a little more "asthmatic/wheezy" than it used to"
Unfortunately, there's no solution posted for his issue.
Any thoughts please? EGR?