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Volvo 1991 740 Model
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 11.
Faulty 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
Faulty 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.
Ice in injection system
Park the vehicle in a warm garage and add fuel line de-icer to the fuel system.
Blocked air cleaner/fuel filter
Change cleaner/filter
pg. 6:17 Service diagnosis (cont.)
Tire imbalance or vibration during
driving
Wheel imbalance
Have the wheels re-balanced.
file:///K|/ownersdocs/1991/1991_740/91740_14.htm (6 of 8)12/30/2006 8:58:02 AM
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