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1985 Volvo 740 GL, GLE, Turbo
This is an emission control system designed to reduce emissions and improve fuel economy.
An oxygen sensor monitors the composition of the exhaust gases leaving the engine. The exhaust gas
analysis is fed into an electronic unit which continually influences the a frequency valve. This adjusts
the air-fuel ratio to provide optimum conditions for combustion and efficient reduction of the three
major pollutants (hydrocarbons, carbon monoxide and nitrous gases) by a 3-way catalytic converter.
pg. 96 Servicing
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 chemical reaction to occur without actually taking part in it.
The emission (CO, HC, NOX) content will increase if the catalytic converter is damaged. Lambda-sond
equipped vehicles use Catalytic 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".
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