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Hi Dave,
We're making progress. That 9V on the Fuel relay coil ground (86/2) is the battery voltage dropping lower due to the cranking load—and the absence of the ECU-provided ground. According to Art Benstein, "It should be around 0.5V when the ECU sends the "ground". I didn't suggest you observe the armature, but am sure it didn't move.
An Ignition failure could cause this symptom, but since it runs on starting fluid, we'll assume that's OK. That leaves the ECU itself, or the connection from ECU to Fuel rely 86/2, OR something ECU-related in the harness you installed, (after which you said "now it won't run").
Two suggestions:
1a) Give us more info on the harness — from a reliable source? did you get any instructions with it? what connections did you make? how many ground points", etc.
1b) If you have access to a Bentley 240 manual (recommended, to go with your new meter), compare your intake manifold area ground points to page 390-5, Fig. 10. (Fig. 11 is for 87 and later)
2) Temporarily substitute for the missing ECU ground with the free end of a grounded wire jammed into the back of the relay harness plug at 86/2 so it makes contact with the Blue/Green wire terminal . This should cause the fuel relay armature to close (and the Fuel Pumps to run) as soon as you turn the Key On, and send 12V to coil terminal 85.
But I'm not optimistic, based on 10-7, The fuel pumps ran while both relays were held closed with paper.
That's good, but...With both of the relays held closed with paper, the car didn't start
That's NOT good.. and later, I...used a jumper wire on the left side of the fuse block from the 4 to the 6 terminal, I cranked the engine, I could hear the louder pump ...., but it didn't start
Again, NG.
It's looking like more than a basic fuel issue, possibly something ECU-related (ie, no injector control) due to the harness replacement. Hope the battery holds up a while longer.
Bruce
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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