I had a problem almost just like this and tore my hair out for days. Turned out to be a weak coil; when I tested the spark (cold) it looked good but when I ran it for a half hour or so it would start to go out. If this is what is happening to you, beware, it will get worse and you will have to be to...

Look for a little rubber plug in the speedometer face. You may be able to reset it just by pressing in on the plug, but what I do is pull the plug out with a needle nosed pliers and press the button behind it with a wooden skewer.

The relay board is up on edge inside the console, facing out toward the right-side footwell. You have to drop the big plastic doodad from under the dash on the right side to get to it. The relays are packed so close together on the board you can hardly work them loose. The fuel pump relay is green o...

I've had a couple of ATs go out on Volvos. Both of them were the AW71 overdrive transmissions; I had one of them done in a shop and took apart the other one to see what was wrong after I gave up on the car. The shop rebuild cost me about $1700. You can pick up one in a junkyard and swap for a few hu...

It's not behind the ashtray! The fuses on this car are at the end of the dash on the driver's side. Apparently the 1991 940 SE is a little "different"...