1989 Volvo 780
Check distributor cap for cracks and wipe clean on inside.
Check that all electric leads in the 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 ignition system are clean and correctly connected.
Ice in injection system
Park the vehicle in a warm garage and add a fuel line de-icer to the fuel system.
Blocked air filter/fuel filter
Change filter.
pg. 78 Service diagnosis
Tire imbalance or vibration during driving
Wheel imbalance
Have the wheels re-balanced.
Incorrect tire pressure
Check and adjust tire pressure.
Level of oil in power-assisted steering pump too low
Check and fill oil, see section "Power steering fluid".
Engine overheats
Radiator hose cracked or leaking
Check and replace if necessary.
Insufficient coolant
Check and fill coolant, see section "Cooling system".
Fan belt frayed or belt tension incorrect
Replace or adjust tension.
file:///K|/ownersdocs/1989/1989_780/89780_05.htm (16 of 18)12/30/2006 8:24:26 AM