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This was in my first 940 Regina running problem, and I don't recall seeing the cause turn up before, in nearly 6 years of almost daily scanning here .
Symptom: Abrupt power loss at 50-60 mph, after about 3 miles. No problems in preceding week (175 miles) on local gas fill up.
Indications:
1) Tach did not fall to zero, but dropped slowly as I pulled over to shut it off and swap in a good Fuel relay. Engine then restarted normally.
2) Engine failed again in about a mile, restarting quickly. This repeated two or three more times on the remaining 3+ miles to the store.
3) After a few minutes of shopping, the engine started normally and was trouble free on the 7 mile drive home.
• Next was a two day interval of no driving (waiting for salt-free roads). At that time, the plugs looked clean and normal, and I rigged an ammeter in the Fuel Pump circuit.
4) Installed a new RS Relay (FCP Hungarian) and started out on the same route. Got the same power loss symptom in less than 1/4 mile. Tach was normal as before, and Fuel pump current was a steady 8 Amps.
5) Also found that it would restart "on the fly" by turning the Key Off and On again.
6) After about 3 miles and several "on the fly" restarts, the trouble went away. And as before, the trip home was trouble-free.
An under-hood repair solved the problem, and confirmed my hunch that the plugs would have been "clean and dry" if checked. (I didn't get to them on the road.)
Any guesses as to the culprit?
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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