This what I have swapped out with my 90 744ti, fuel pump relay, fuel injection relay, power stage, fuel pressure regulator and coil. I have disconnected the air mass meter and checked all of the connections. The hall sensor has been replaced and I am getting a tach signal (tach is jumping while cranking). All of the ignition components are in good shape and the timing belt is new. The fuel pumps do not come on when the key is turned on but they will come on when the relay is jumpered. The engine will not start with the relay jumpered. I am getting fuel pressure at the rail. I am getting 12 volts to fuse 11(I checked the correct fuse but could be misstating it). I am obviously not getting the signal that turns on the pumps. My 90 740 runs fine it just has a leaky water pump therefore all the parts swapped are in good shape. Where do I go from here.



From previous post.
Last Thursday when I attempted to start my 88 745 N/A the engine caught but immediately died. It then turned over but would not start. It sat for several minutes then immediately started and I did not have any more problems until this morning. When I cranked the car it caught and died twice and then would not catch. The engine was turning over not a dead battery. It then started but I turned the engine off and it would start again. When it does start it cranks immediately and runs fine.
This is what has been done to the car recently. Plugs, cap, rotor, wires, hall sensor and timing belt. I have swapped the fuel pump and fuel injection relay from 90 740. I have also disconnected the mass meter but to no avail. It has a new battery and the connections are clean. The ground on the back of the valve cover is clean. I have not checked the one on the fuel rail but the look to be in good condition. I was going to swap the coil and check the condition of all the fuses tonight.
Does anyone have another suggestion?
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90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry