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1993 Volvo 850 GLT
pg. 8:7 Servicing (cont.)
Torque exhaust and intake manifold nuts
A loose manifold could alter air/fuel ratio and cause an increase in emission and/or poor driveability.
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 the distributor vacuum unit, connections on heater control
servo systems and hydraulic brake servo.
Checking and adjusting idle air control system
Your Volvo is equipped with an electronically controlled idle air control 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 leak-free system.
Check for proper sealing of the gasoline filler cap which contains "O" ring type seals.
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