1991 Volvo 780 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Volvo 780
1991 Volvo 780 Problems
The fuel pump relay may fail resulting in a "no start" condition, the engine will crank over but will not start and run. Checking for proper fuel pressure would be the first step in diagnosing this concern.
Engine stalling/stumbling problems can be caused by a failing mass airflow sensor.