Black power and smoke loss

Good friends, I have a serious problem with a Citroen C 3 1.4 HDI, which has a slight loss of power and gives off a great black smoke when it accelerates. The engine regime is normal, no Chek Control light is turned on. Thinking that I could be some tuft of cracked admission I have reviewed everything and I have replaced the four toric of the admission collector. But the failure persists. I have been reading around, and some believe that they are the Ijectors, but in those failures the engine usually stops, in this case the operation is perfect, without failure to the idle. The truth is that you have crazy ... what do you think? I think (it is the only thing that is to look at) that it can be the obstructed catalyst ... since if it were the EGR, the consumption would increase and the witness turned on. Please lend me a hand ..... thanks

Hi Ferguvelez.
The failure in an injector or the poor work of several does not stop the engine, you should try each one with the engine working, the test is done by removing the fuel supply one by one and looking if the smoke decreases or for, it is the way to rule out injector in poor condition. Luck.
Miguel

Thank you, I will check it if it is the problem .... In addition, another symptom is if the escape upholstered, when I release it, it releases a plug of exaggerated black tigne ..... thanks will follow your advice.

Hello, I apologize to the same problem in a peugeot 406
td the car works well, but when I tapo the escape pipe the black smoke with particles comes out exaggeratedly
I still found a solution I am worried
hug and thank you very much

You must control the EGR valve that can be locked and is having the exhaust's gas touched to control that valve or you can have the multiple
ostrured with ollin of the same