Sorry for slow updates. I am working hard on this and it's wearing me down a bit.
I did get all the injectors out of the manifold and rails and then I used some parts I've borrowed to try and clean them. I don't recommend what I did which involved open jars of solvents, dubious wiring, a fuel pump and holding the injectors into an aluminum adapter I had. I made it through once and didn't burn down my house. Next time I will try something safer.
Most of the injectors worked. Three of them occasionally dribble instead of spray, maybe about once every 10-15 seconds. That's with the proto ECU hardware running them at 1500 RPM. I think thy all show the same scope trace now. I haven't been able to tell if they give a different trace when they dribble as opposed to spray.
I want to get this right and I spent the entire day today trying to choose a capacitor for the power input to the unit. Sometimes there just aren't perfect choices. Trying to pick between parts with limited lifespans vs. ones that occasionally burst into flames.
I have spent a little time on some other sites like the DIYEFI, but mostly just grinding on this board right now. I'm trying to choose a CPU chip in a package that can be upgraded to the next generation part. The newer part has a 4000 page manual. I'm too tired to actually roll around on the floor laughing so you'll have to imagine that!
John I hope the system will run well under 10 volts. I'm not sure about this yet. Up nawth heya, we hardly have any volts at all on the winter mornings. The auto industry has a lot of specs for these things. That's why I'm worrying about that cap, so the processor runs thru the cranking pulses in cold weather.
This hardware has provision for measuring the spark duration and also short circuits and open circuits and some temp limits for the injectors and coils. Not stuff I designed, it comes with the modern chips for these things...
So at least we don't make fuel corrections from the O2 sensor if a plug is not firing...