which loom did you change, the one from the injectors to the block connectors on the bulkhead or from the bulkhead to the ecu block connector behind the glove box.
all injectors get a 12v supply from the fuel injection relay.but each one has an indivdual earth to the ecu. injector number 1 earths through pin 35 at the ecu.
disconnect #1 injector plug and with ignition on check for 12v at one of the 2 pins in the plug i,m not sure if this times out after a few seconds until you crank over the engine.then go to the other pin and check for continuity between that point and pin 35 in the block connector at the ecu.if your not getting 12v to the injector then there is a break somewhere between the injector and the square 6 pin block connector on the bulkhead (all 4 injectors are supplied from the red wire in this block). if there is no continuity from the other pin to ecu pin 35,then there is a break between the injector and the other block connector (the one with the long pins on the engine side of the loom i think its the one closest to the fuse box) or between there and the ecu pin 35,
hope that aint to much reading