Thank you all for your input. I have dealt with vapor lock some years ago on an old Dodge Reliant K car. The fuel line was routed too close to the strut tower and manifold causing the fuel to boil in the line. It would run great for about 30 miles then just shut off. It would not restart until the car cooled, usually about 45-90 minutes. A simple reroute of the fuel line and insulating it with some old heater hose corrected the problem. It is rare, but it does happen.
No, I am positive my problem is not vapor lock. I do not believe it is possible on a high pressure system anyway. This TPI system runs 40-47psi constantly. I have a gauge hooked up to the system and it never loses fuel, the pump does not bleed off and the pressure regulator is functioning properly.
It is not losing spark, and I have not replaced the coil. The coil is entirely secondary ignition and the problem is no injector pulse when cranking. Being port fuel, each cylinder has its own injector. The injectors are controlled on the ground side by the ECM. The ECM receives a reference signal from the module telling it when to pulse the injectors, (or provide a ground signal). There are 2 banks, essentially left and right. Each bank is powered by a seperate fuse that is hot all the time. My injectors never lose power, they just are not being grounded by the ECM, so they do not spray fuel.
The thing I am having trouble with is that when I test the entire circuit, it all functions normally. Meaning, if I manually pulse the module, the injectors pulse. This tells me the module is bad. As I already stated, I installed a new one. No pulse. I installed a known good one, (it worked on another car). No pulse. I purchased another new one from another source. No pulse.
I replaced the ECM, with another known good one. No pulse. I replaced the PROM. No pulse. I just replaced the pickup coil (or pole piece), yesterday. No pulse. If I pulse the cold start injector, the cylinders fire, the ECM pulses the injectors and it runs until I turn it off. 2 minutes or 2 hours. Once you turn the key off and try to restart it, no pulse. Add fuel through the cold start circuit (hot or cold), it starts right up and it is good again until it is turned off.
I apologize for being lengthy, but I am hoping someone has either seen this problem already or thinks differently than I and can lead me in the right direction.