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Volvo 1991 740 Model
Air cleaner
Replace the air cleaner cartridge with a new one every 30,000 miles (48,000 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.
Vacuum fittings, hoses and connections
Unstable idle, misfiring, or poor emission control is often caused by leaking vacuum hoses or
connections. Check hoses and connections on distributor vacuum unit, connections on heater control
servo systems and hydraulic brake servo.
Checking and adjusting idle speed
Your Volvo is equipped with an electronically-controlled idle speed system that requires no checking or
adjustment.
Fuel system cap, tank and lines, and connections
The effectiveness of the fuel system to contain hydrocarbons is dependent largely on a leakfree system.
Check for proper sealing of gasoline filler cap which contains "0" ring-type seals. Check all evaporative
hoses in vehicle for tightness. Check fuel lines under vehicle and repair if necessary.
Fuel (line) filter
The fuel line filter is located next to the fuel pump. This filter should be replaced every 60,000 miles
(96,000 km). The filter is replaced as one complete unit.
Replace more frequently if contaminated fuel is introduced into the tank (or if there is reason to suspect
that this has occurred).
Timing gear belt
The timing gear belt should be adjusted at the 600-1,200 mile (1000-2000 km) inspection. We
file:///K|/ownersdocs/1991/1991_740/91740_18.htm (5 of 11)12/30/2006 8:58:05 AM
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