owners manual Volvo XC70

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08 Starting and driving Emission controls or removing components, and/or repea-Economical driving ted use of leaded fuel. Better driving economy may be obtained by Three-way catalytic converter thinking ahead, avoiding rapid starts and • Keep your engine properly tuned. CertainNOTE stops and adjusting the speed of your vehicle engine malfunctions, particularly involving to immediate traffic conditions. Unleaded fuel is required for vehicles with the electrical, fuel or distributor ignition three-way catalytic converters. systems, may cause unusually high three- Economical driving conserves natural way catalytic converter temperatures. Do resources not continue to operate your vehicle ifHeated oxygen sensors Observe the following rules: you detect engine misfire, noticeable lossThe heated oxygen sensors monitor the oxy- • Bring the engine to normal operating tem- of power or other unusual operating con- gen content of the exhaust gases. Readings perature as soon as possible by driving ditions, such as engine overheating or are fed into a control module that continu- with a light foot on the accelerator pedal backfiring. A properly tuned engine will ously monitors engine functions and controls for the first few minutes of operation. A help avoid malfunctions that could dam- fuel injection. The ratio of fuel to air into the cold engine uses more fuel and is subject age the three-way catalytic converter. engine is continuously adjusted for efficient to increased wear. • Do not park your vehicle over combusti-combustion to help reduce harmful emis- • Whenever possible, avoid using the vehi- ble materials, such as grass or leaves,sions. cle for driving short distances. This does which can come into contact with the hot Related information not allow the engine to reach normal exhaust system and cause such materials operating temperature. to ignite under certain wind and weather• Information displays – warning symbols conditions. (p. 74) • Drive carefully and avoid rapid accelera- tion and hard braking. Excessive starter cranking (in excess of• Engine and cooling system (p. 273) • one minute), or an intermittently firing or • Use the transmission's Drive (D) position flooded engine can cause three-way cat- as often as possible and avoid using kick- alytic converter or exhaust system over- down. heating. • Remember that tampering or unauthor- ized modifications to the engine, the Engine Control Module, or the vehicle may be illegal and can cause three-way catalytic converter or exhaust system overheating. This includes: altering fuel 08 injection settings or components, altering emission system components or location }} 279

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