qldit

Good Afternoon dgoad, gee you have really gone into this, I never get that deep.
If the injectors have a problem I set them up on a bench with a bit of fuel pressure and observe how they perform simply by toggling a simple switch, I am really only interested in seeing them spray nicely and open and shut off properly.

As far as I am concerned the open loop situation with the O2 sensor should alter timing when running so the circuit should self regulate.

I only replace injectors with identical items, so I haven't any experience with interchanging different types.

I have seen computers in a limp mode without any indication that is what had happened, so I really don't trust any codes on an obviously kaput system.

One chap had changed the MAP sensor several times because of error codes where in fact the actual computer was the problem.

It happens that you may see MAP sensor error codes and when you replace the computer those codes don't show, so it can be very confusing.
I suspect the voltage regulator in the computer can cause this effect.

Sometimes I have found the area of the voltage regulator and board cooked, that is why I like to take the cover off and actually visually check.
One fellow had spent many hundreds of dollars on his machine to various repair places and in ten minutes I had the computer out and cover off and pointed out, "this might be your problem"! one board area was charcoal and tracks were damaged.
So I never get too involved without having a visual look at constant problem machines these days.

You sure are going through a learning experience there, keep the test info coming!
It is really stirring up my grey matter!

Cheers, qldit.