Volvo 1990 780 Model
pg. 77 Service diagnosis
This section contains information which can be of help in the event of a breakdown. Only those faults
which can be rectified with the vehicle's tool kit are listed.
The engine does not start or is difficult to
start.
The instructions for starting the engine have not been followed.
Follow the instructions in section "Starting the engine".
The battery is poorly charged or dead
Start the vehicle by using an auxiliary battery.
Recharge the battery.
Find out why the battery is poorly charged.
Poor contact in the electrical system
Check all leads to spark plugs, coil, distributor, battery and starter motor.
No fuel reaching engine
Check that there is fuel in the tank.
Check that none of the hoses in the fuel system are loose.
Check that the fuses for the pump are not faulty, fuses No. 1 and 12.
Faulty distributor ignition system
Check spark plugs, electrode gap should be 0.028" (0.7 mm), and wipe clean.
Check distributor cap for cracks and wipe clean on inside.
Check that all electric leads in the distributor ignition system are clean and correctly connected.
Misfiring and erratic engine
operation
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