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Volvo 1990 740 Model
The EGR valve should be inspected at 12,000 miles (20,000 km) and thereafter cleaned every 24,000
miles (40,000 km).
pg. 107 Servicing (cont.)
WARNING!
The distributor 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 distributor ignition components e.g. plugs, coil, distributor, HT leads etc.
Do not touch any part of the distributor 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 the spark plugs, clean the terminals and the rubber seals. If the car is driven on roads
where salt is used during the winter, coat the cables with silicone.
file:///K|/ownersdocs/1990/1990_740/90740_22.htm (7 of 7)12/30/2006 8:26:07 AM
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