I think i've found the problem - I didn't check the voltage on the injector wire with the ignition in the 'on' position, and it is +12v. I thought i'd be ok taking the feed from the wiring on the ECU in the cabin. Am I right in thinking i now measure the voltage on the plug on an injector, and connect it to the one that shows 0 when ignition is on?
Bit of a pain, I didn't want to tap the wiring loom in the engine bay
