I have 1993 850. It Starts fine, but after driving it for about 15 minutes or so, it just dies. We have changed the fuel pump and filter, have taken out the fuel relay and jumped it, the relay is still good..we have run it with and with out the MAF sensor, the sensor is still good. Someone suggested the O2 sensor...have no clue where to locate it. Really at a loss here, and not sure what to do...any suggestions would be greatly appreciated..

 

Hard to chase down those grimmlins. Stalls when it gets warm??? Is it overheating?

 

Yes, stalls when it gets warm, but does not over heat

 

I have heard of relays opening connections when they get warm. Also, you have two relays, the fuel pump relay and the fuel injector relay at the fan scrod. I would try changing those as much as I hate throwing parts at a car, seem like you have already been doing it.

 

Well have to check out the fuel injector relay....can you please tell me where the O2 sensor is located?

 

Temperature control sensor? Look at the temperature gauge when the car is warm. The needle should stay rock steady at the 3 O'clock position. If it is not, or it flucuates, it could be a bad sensor. I had one go bad and no codes

 

The o2 sensors are bolted on the exhaust. They should NOT cause your car to stall.

Do you have a cel?

 

Even if you cut the wires to both of the O2's your car would run. You would have a constant check engine light and the engine would be a little "doggy" and burn a bit more fuel but it wouldn't die. The O2's aren't critical and if the computer loses the input from either or both it just goes into a backup mode and runs richer with a loss of performance.

How long does it have to cool down before you can get it started again?
Next time it dies test to see if you have spark. Pull the coil lead at the cap and lay it next to (1/4") a ground to see if it jumps. Trying to figure out if it's gas or spark you loose is a first step in making a better choice in what part to toss at it next.