008518 - Supply Voltage for Fuel Injector Group A
P2146 - 000 - Open Circuit - Intermittent

Hi

Looking for some advice on this one please. The above car cranks, offers to start briefly but then flashes the coil light and stops cranking. It logs the above fault code that clears until you try to start it again. Checks done so far:
All power and ground supplies at ECU present and checked under load.
Checked injector wires from injectors to ECU under load.
All fuses checked.
Resistances of injectors are 180 Kilo ohms (piezo).
Replacement ECU fitted which was sourced off of the internet. A free running ECU that is supposed to be tested and OK but your never sure what your getting unfortunatly. It does the same with this fitted, doesn't really rule out an ECU fault.
I've scoped all injectors, voltage and current and compared it to a known good waveform off of the Pico waveform library and what you notice is that injectors 2 and 3 look ok but injectors 1 and 4 have about half the voltage and the current flow looks poor. I would put up the image but i'm struggling to upload it.
My thoughts initially were that the ECU was faulty so we sent it to AC tronics for testing but they couldn't test it. We were then supplied with the free running ECU that the customer sourced as a new unit was out of the customers budget. So do we have the same fault with both ECUs or is there something else causing the fault?
Would it be possible that injectors 1 and 4 are faulty?