I've got a 1990 740gl. Its got good spark, good fuel from the fuel pumps, but will not start unless I run the cold start injector from a toggle switch. I placed a noid light on the injectors and have discovered no injector pulse. I have tried swapping the powerstage, fuel injection computer, fuel injection relay, fuses to both the fuel computer and in-tank pump, swapped the radio suppression relays and have also tried grouding out the injector ground wire at the ECU to the car's frame. None of this has been successful. Is there anything else I can try? This car is driving me nuts!