Mechanical problem

Very good companeros first time that Solisito Income helps since I have a 2002 FH11 Model Volvo Truck with D12C Model and I have starting problems the engine turns well but it does not start already check fuel system and this Vien, sensors are Vien, when I manage to start it the engine works normal, if someone has any information of these trucks I appreciate your GRASIAS help

Czech first of all the incandaent spark plugs, that to start.