i have this problem with my r31 every once and a while, theres a temp sensor linked to the injectors that plays up, it will shut the injectors off, no fuel flow at all, with my wiring there is a wire running from, ok you know where the radiator connects to the head at the top there are two sensors, now the one closest to the head has a wire running to some wires connecting to a plug at the fire wall where the wiper motor is! there are something like 8-10 wires running into it, different colours, do you have anything like this with your wiring?