but first, i ask from my mbclub guys from lithuania to borrow me a map sensor for a few hours and i will see then
by the code u can find only few on internet, but no denso or bosch... i have no choise here ..
very nice topic you have now for egz. for my W202 2.5 TD
so i dont feel much deference, at low rpm it feels exactly the same (should map sensor ad some fuel when it senses vacuum ? ) i think i will buy and mount a boost gauge, it will help me to see whats happening there. But still, adding resistance even 3kohm to IAT sensor makes a LOT of difference at low rpm, i can change gears at lower rpm, i can easily get smoke after turbolag is finished with 2nd or 3rd gear 
last time i was driving like 70%highway 30% city i had 7.3litres/100km in 730km ~52litres. i Still bother, how the car should be so slow at the low rpm, if it could be faster, via richening the air/fuel ratio. The question is still, does map sensor richens fuel mixture at low rpm when sensing the vacuum.? so then it would be next question: how to make map sensor more sensitive to the presure changes via some eletronics? i could not found some turbo diesel map mod only for petrol D: i wont give up on my merc what i found today it was very interesting, actualy i was happy that i found something wrong atleast in 1year i was in limp mode and i was happy just another day i was driving back from town, engine was 80C, i have stoped and decided to test if there is some smoke, start to rev up, and.. it wont rev more than 3500rpm, so this is limp mode, and it must to write some errors to oBC so i will go for a diagnostics, monday. So can this be EGR valve related ? i have turned that off bypassing with vacuum pipes. after i get codes readed i will think then what could be done/cheked more, cause i tried all dammn posible fixes from arround the world.) IAT and MAP, but i found some codes that I cannot explain whats is wrong. so here is what i got: 
