Operation Manual

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1979 Volvo 242 244 245

provide optimum conditions for combustion and efficient reduction of the three major pollutants

(hydrocarbons, carbon monoxide and nitrous gases) through a 3-way catalytic converter.

Change oxygen sensor unit and Inspect electrical connections of Lambda-sond

system

The oxygen sensor must be replaced every 30,000 miles (50,000 km).

To remind the driver about the change of the oxygen sensor unit there is a special reminder light (See

section titled "Warning Lights".) The light will stay on until reset.

At the same time the electrical wires and connections of the Lambda-sond

system should be inspected

for chafing and corrosion. Replace as necessary.

Fuel (line) filter

The fuel filter is located on the firewall. This filter is to be changed every 15,000 miles (25,000 km). The

filter is replaced as one complete unit.

Replace more frequently if contaminated fuel was introduced into the tank.

Air cleaner

Replace the air cleaner cartridge with a new one every 30,000 miles (50,000 km). The cartridge should

be replaced more often when driving under dirty and dusty conditions.

The filter cannot be cleaned and, therefore, should always be replaced with a new one.

pg. 52 Emission control system

Checking and adjusting idling speed and mixture ratio

These checks should be made every 15,000 miles (25,000 km). The idling speed should be adjusted and

the mixture ratio check at the 600-1,200 mile (1,000-2,000 km) inspection.

Fuel system cap, tank and lines and connections

The effectiveness of the fuel system to contain hydrocarbons is largely dependent on a leak-free system.

Check for proper sealing of gasoline filler cap which contains "O" ring type seals. Check all evaporative

hoses in vehicle for tightness. Check fuel lines under vehicle and repair if necessary.

Inspection of fuel injection electrical connections

The electrical connections and fuel lines in the injection system should be checked for chafing and

corrosion every 15,000 miles (25,000 km).

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