Volvo 1990 780 Model
Warning!
The ignition system operates at very high voltages.
Special safety precautions must be followed to prevent injury.
Always turn the ignition off when:
●
connecting engine test and diagnostic equipment to the vehicle (timing light, tach-dwell tester,
ignition oscilloscope, etc).
●
Replacing ignition components e.g. plugs, coil, distributor, HT leads etc.
●
Do not touch any part of the ignition system while the engine is running. This may result in
unintended movements and body injury.
Replacing spark plugs
The spark plugs should be changed every 30,000 miles (48,000 km). However, city driving or fast
highway driving may necessitate changing after 15,000 miles (24,000 km) of driving. When installing
new plugs, be sure to fit the right type and use correct torque, see "Specifications". When changing the
plugs, check that the suppressor connectors are in good condition. Cracked or damaged connectors
should be replaced.
When changing spark plugs, clean the cables and cable terminals, also the rubber seals. If the car is
driven on roads where salt is used during the winter, coat the cables with silicone.
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