This is old news to me and many others about the 'Board', But it got me again.
My old 86 diesel bugged me with the occasional failing rear wiper. By chance I found the delay relay that was failing and found that the solder joints in the relay had just jiggled too many times and had let go. I had found them and resoldered them and went on about business.
This too has happened to me, with much frustration, concerning an intermittent shut-down of the engine.

I thought it was a stall, but nOOOOOOO, it was a shut down.
Sometimes when the key was turned on I didn't hear the whine of the fuel pump.
Every time I didn't hear the whine of the fuel pump, the car wouldn't start.

I pulled the fuel pump relay and opened it and found a few solder joints cracked.
(this was under a good lens)
I also had a bum rear wiper,as in my '86 diesel,so I pulled it's relay and soldered a few bum joints there.
My '92 gas model 745 is a way more PITA than my '86 diesel.
Relays fail the same way in any early model vehicle.
Keep this in mind when you have intermittent problems.

Have fun, and share the knowledge. ED7
Best to be thought an idiot than to open your mouth.

My 1990 745 was far more trouble than my 86 745 ever was.
'though they will jump all over me for saying so, I dislike the regina cars.

You said your car just shut down? like someone turned the key off, or was it like someone just shut off your motor? where the instrument lights on? I ask because When my Radio Seupression Relay first started going (months before full failure ever developed), the engine would just shut off randomly - in the middle of the highway, at stop signs and otehr random inappropriate places. When it fails the computer-side power is cut to your fuel pump.

You might take a look at it if you have not already.
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1967 P220 Amazon, 1972 145S, 1976 245 DL, 1983 245 DL, 1986 745 GLE, 1990 745 GL, 1995 945....
You mean to tell me that Volvo makes cars that are *NOT* Wagons?!?

Thanks, Ed: it's in the FAQ now.
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See the 700/900 FAQ under 'Select Link' button on the top right.