1994 940 Turbo
 

I have 2 scenarios going on with this car. My engine dies while driving the car. I have noticed that if I run the A.C. or the temperature is above 95 degrees outside the engine dies much more quickly. Often, it doesn't die at all if the temperature is below 90 and I do not run the A.C. Coincidence or not? Once the engine dies the motor will not turn over. But if I jump it off it starts right up. Secondly, letting it sit for a while 30 minutes to an hour, it will start up without being jumped off. Does any one have any ideas about this problem. I have had everything checked out such as the battery, alternator, starter, spark plugs, block cables, starter cables.

Do your warning lights illuminate when you have the key in position II? Especially the Alternator/Battery one? Your alternator will not charge unless that light comes on, then goes off once car is running. This creates much confusion as the battery could be fine, and the alternator could be fine, but the alternator has to get "excited" by the dash light to begin charging. Should eliminate this first...

I had same problem I found that some one had put lube on Crank sensor electrical connection. This is located upper firewall. Cleaned all electrical contacts with Brake cleaner.
My hot stalling problem was resolved. Happy Day

In my experience, long ago, with these cars when they were newer, two things would typically result in either stalling or no start.

1. - Crankshaft position sensor on back of engine block. The warmer the weather, the higher the resistance in ohms to get a signal to move. If the insulation is coming off the sensor, it is likely the failure.

2. - Fuel pump relay gets weak for the same reasons.