You see i can only deal with how "Bosch " made the system....the actuator acts like a old school "choke" on cars....needs more pressure of fuel on cold start...but reduces pressure on warming up....what i feel has happened the screw you see in the actuator has been [ and come across this back in the day ] turned right up to give much more pressure...those wanting more performance....but the idle will never be right..to reset the screw is a pain without pressure test equipment...etc...so at the moment it starts without actuator...need to road test ...how is the drive...how is the idle...its set up for High boost...High performance..bet thats what has happened in the past. to put it back to standard...needs new actuator...water temp..[ well your getting that ] and hope the Black ECU is OK....because as i see it..could almost need no 5th injector to start ?...not sure there..think your saying has helped ?....Peter