Hi, so i've replaced my injetors for a "refurbished" ones, but know it smells really bad and a little black smoke comes out of the exhaust.
There is no use of changing injectors codes because they are not original. What do i need to do to fix this? Change duration at idle?
Like less 10% or something like that?

Car: Pug 406 2.2HDi EDC15c2 Manual 2001

Smell and smoke is bad combustion point. If new injectors are tuned you need to adjust duration maps, soi, pilot etc.