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"I connected a digital volt meter to the injector connector. I got no voltage reading with the key on, or while cranking the engine .
I am guessing that I should have got a voltage reading of some kind at the connector ?"
Yes—but it depends on how you used the meter. When the Fuel relay closes (running the pumps) it also puts 12V on all 4 injectors (the pins fed by Yellow-Red wires). The ECU fires the injectors by Grounding the other pins (Green-White wires).
If you put the leads across the 2 pins of an injector—and the ECU (for whatever reason) fails to provide the ground—I don't think you will read anything. Because that G-W wire is basically not connected to anything until the ECU grounds it.
Try again, but with meter + on a Y-R wire injector pin, and meter - on one of those manifold grounds. You could try first statically, with that added ground wire on relay 86/2, and Key ON. But for "real world" you should see the 12V there when cranking.
If you don't see 12V at injectors (Fuel relay closed), let us know and we'll try some other places.
If it had not fired on Starting Fluid. I'd be leaning toward an Ignition problem now (which in itself will stop Fuel operation—or have I said that already?) New plugs will be a good thing anyhow.
Did/can you check basic Crank-Cam-Distributor timing as I suggested at item #2 in last post?
Bruce
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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