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.
Resources for the Repair and Maintenance of your 1991 Volvo 780
1991 Volvo 780
1991 Volvo 780 Problems
Engine stalling/stumbling problems can be caused by a failing mass airflow sensor.
The transmission overdrive relay often fails, preventing the transmission from shifting into overdrive
When braking, a loose feeling from the front end can be caused by worn strut rod bushings. Worn bushings will require replacement. After they are replaced the wheel alignment should be checked.
A faulty RPM sensor can cause the Check Engine Light to come on and cause a "No Start" condition.
1991 Volvo 780 Recalls (Recent)
Summary: VEHICLE DESCRIPTION: PASSENGER VEHICLES. DUE TO LIMITED SPACE AND VARIATIONS IN THE ASSEMBLY OF THE CABLES, CHAFING OF THE INSULATION OF THE CABLES FEEDING THE SEAT HEATER, POWER SEAT MOTORS AND SEAT BELT WARNING INDICATOR SITUATED UNDER THE FRONT SEAT, CAN OCCUR.Learn more »