I have good pressure up to my injectors but they do not open and no fuel gets into my cylinders. The fuel rail is definitely pressurised. What kind of signal opens these injectors? Should I get a voltage reading across the wires leading to the injector while cranking the engine? I get 15.9 ohms read...

I have a 1988 740 GL that won't start. It starts with starting fluid, but won't continue to run, so I know the ignition system is good. I've bypassed the M.A.P. sensor, it still won't start. The fuel filter (under the driver is new), as is the pump. The pump is wired correctly, so it pumps in the ri...