I just made a huge mistake , When I went to remove the intake manifold some of my labels came off my fuel injection wires, so I have a couple where I am not sure where they go. but looking at the volvo wiring book, if I understand this correctly, which makes no sense to me but all the fuel injectors fire at the same time. All the fuel injectors are wired to # 18 terminal on the fuel injection computer, than all the ground wires from the injectors are wired to the fuel injection relay. I assumed the injectors fired separately from each other. Does any one else notice this?