Volvo 760 GLE Turbo 1986 Manual page 110

1986 Volvo 760 GLE, Turbo
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Lambda-sond (oxygen sensor system)
Change oxygen sensor unit and reset service indication for oxygen sensor (760 GLE only)
The oxygen sensor must be replaced every 30,000 miles (48,000 km).
To remind the driver about the change of the oxygen sensor unit there is a special reminder light, which comes on at 30,000 miles (48,000
km) intervals.
(See "Warning lights"). The light will stay on until reset.
Note: Failure to follow the recommended maintenance may result in vehicle not meeting Federal or state emissions standards.
Catalytic Converter
This is a supplementary device in the exhaust system, designed to clean exhaust gases.
This device is mainly a container with a ceramic material insert, designed to let the exhaust gases pass through channels in the insert. The
channel walls are covered by a thin layer of platina-palladium. These metals act as catalysts, permitting a chemical action to occur without
actually taking part in it.
The emission (CO, HC, NOx) content will increase if the Catalytic Converter is damaged. Lambda-sond
Converters containing platinum and rhodium.
Torque Catalytic Converter mounting bolts
The Catalytic Converter mounting bolts should be torqued after the first 600-1,200 miles (1,000-2,000 km).
CAUTION:
Vehicles with Catalytic Converter must use unleaded fuel only. Otherwise the Catalytic Converter will become ineffective.
See "Fuel requirements"
pg. 104 Servicing
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 10,000 miles (16,000 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
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equipped vehicles use Catalytic