I just got a 1987 240 DL with a recently rebuild motor and ever more recently rebuild trans knowing that it wouldn't run and that the fuel computer was bad according to the mechanic that worked on it last. After some exhausting troubleshooting all I managed to do was to eliminate some areas of concern but it is getting more comfusing.
Here are the facts.
The car starts for a brief second when cranked and dies.
If I disconnect the Mass Airflow Sensor it starts and idles but dies as soon the throttle is depressed or the sensor is reconncted. I checkec the sensor per the diagnostic in the chilton book and it checks OK. I replaced the Fuel Computer 3 times now and it still does the same thing. I replaced the Air flow sensor and still the same. I even replaced the iginition module and it is still the same. I checked the temp sensor and it is OK per the Chilton Book.
So....what gives??/
I replaced the Fuel Pressure regulator just because, but that wasn't it either.
I checked the fuel pressure and it is a solid 30 PSI.
I checked grounds all over, vacuum leaks, repaired any cracked hoses, but still the same.
Help Please

I suspect that the ignition module is fine and does not need to be replaced.

What you have is probable a marginal ignition wiring harness that needs replacement. Buy a replacement from Volvo or Dave Barton and the problem will go away. If you look on this site you will see my similar problems, except I was getting no spark.

If the ignition wiring harness has not been changed on this car, this is the problem.

-Wynn 240GL Wagon 240L miles

Hey PLC, I'm no expert, just throwing in my two cents. ...
Did you check the spark? Timing?
I have heard here in the board, in the past, that a misfire or untimed engine may allow a start, but once the fuel is injected via throttle, it floods, dies.

Just something to think about. Good Luck.

87-240DL