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Hi Phil,
Yes, I forgot to comment on the ignition. I believe 85-88 cars were the beginnings of NOx-reduced spark control. This list has known for 10 years or so to plug the vacuum line on these V/C or "computerized" ignition controllers to help pass a flunked NOx test.
OP brought up a very good point about the reliability of the load sensor. It does indeed use a diaphragm, however the diaphragm's load is negligible, unlike that of a vacuum advance on a distributor. All the V/C's diaphragm needs to do is withdraw a ferrite core from an inductor, just like your old automobile AM radio was tuned. No mechanical load to speak of, and the inductor provides a smooth translation of motion to something the microprocessor understands.
Regarding the injectors, I've heard folks claim great and wonderful solutions merely by changing the o-rings on LH. I've never seen that for myself, and as with the injector being at fault, remained skeptical despite the reports. I must admit, where I live, rubber lasts a bit longer than it does in Sunny SoCal, so I'm willing to buy dried-out injector o-rings could leak enough air to backfire.
Here's an advance curve limit spec for a V/C ICU used with B230F engines. The left graph uses RPM on the x axis, and note the y axis indicates variation, not absolute BTDC advance. The right graph's abscissa is read in vacuum, and you might have to translate the metric in your head to see where the expected 19-20 in. in your manifold hits the wild part of that curve. Making that non-linear response (for emissions) and setting an overall limit is a lot easier in the computer, than it was in past distributor-mounted arrangements of two diaphragms for advance and retard.
Like you, I was hoping to find the fuel pressure regulator got modernized at some point allowing computer control -- because that would mean cheap and abundant fuel-compatible electronic pressure transducers could be found in my pick-n-pull. As far as I know, they are still of the same design yours and mine are.
--
Art Benstein near Baltimore
REAL men don't need voltmeters.
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