I.ll put in my findings here.
About 7 or 8 months ago I had my TD5 Disco remapped by a very reputable company that had done 3 of my previous vehicles with great effect. ( all non LR though ! ).
From the moment I started to drive it home I could feel the wonderfull difference in power delivery, most noticable was the eradication of the low down flat spot.
I did, at the same time though, notice a " puff " of black smoke when the car came on boost.
Now, as the months have gone on I seem to be always looking in my rear veiw mirrors to see this " puff ", which is actually more like a " bellow " of black smoke.
I spoke to the re-mapper, ( who is also a friend ), and he reduced the fueling a bit. But this still seemed to make little difference.
Upon another trip back to him, he found an injector fault logged in the ECU. As a result of this I did resistance checks on all the wiring from to red ECU plug up to the injector plugs, then with then connected to the injectors, and all the readings were fine. ( indicating wiring to be ok ). Injector " balance " was a bit out on this one aswell.
I then scouped a cheap injector of an auction site and put it in, ( coded into the ECU ),and all was fine with no more fault codes in 1500 miles.
At this time the re-mapper is still sure that the map is not the problem. So I keep looking.
I must say at this point that, THE CAR GOES LIKE SH1T OF A STICK, ( and always has done post re-map ) HAS NO HESITATION AND IS THE SAME AS BEFORE ON MPG. And also has the correct " boost " pressure and air flow rates.
So another candidate for black smoke is hose delamination. Take off the rigid pipe to inercooler hose and there it is, an egg sized bulge inside the hose. Bingo thinks me, so orders a set of silicne hoses. Fit them on and still black smoke on boost.
So, after reading for months and months and months, about "TD5 black smoking", I can tell you this; If you TD5 has black smoke and a misfire/poor performance, then it will probably be delaminated hose,blocked or collapsed air filter,split turbo hose/intercooler,fauly EGR system, oil in the red plug. ( theres a couple more but I cant remember them at the mo ).
Or, if your re-mapped TD5 goes really well with no faults and reasonable MPG, then it is being over fuelled. ( for a reason I have yet to find ).
From my extensive reading on the matter, it would seem that the TD5 cannot just have a " generic " map put into the ECU.
Again, from my reading, is would seen to be the case that the " TD5 " tuning experts, ( Alive Tuning and Dynachips ), always " road test " and " check for smoke ".
My advise is this,
1, Get your TD5 re-mapped. ( it transforms the cars ).
2, Get Alive or Dynachip to do it.
( I,ve actually bored myself now ! ).
Del.