Land Rover Repair: Td5 1st cylinder injector problem, land rover dealer, discovery td5

Question
I have big problem with engine in my Discovery TD5 1999. With about 95000 km injector on 1st cylinder was damaged. It was exchanged by Land Rover dealer. After next 9000 km the injector on 1st cylinder was damaged second time. It was exchanged by another service shop - (licensed by Dephi). Now after about 2000 km if the engine is cold one cylinder does not work. According to my experience in short time the cylinder will not work permanetly. The both damaged injectors were checked by Delphi licensed service. Outcome was  both injectors give to small fuel dose. I'm very depressed, because the repairs were very expensive and gave no effect. Do you know solution for this problem?
Best regards from Poland - Andrzej

Answer
Have you programmed the changed injectors to the engine management? There is a five digit long code on them.

And have you measure the compression in the weak cylinder?
Try to check the fuel pressure. It must be 4 bar.

With T4 diagnostic equipment easily check which injector cylinder isn't working.