owners manual Volvo V70

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2004 VOLVO V70 pg. 132 Fuel/emissions systems Fuel system The fuel system continually compensates for variation in engine load, speed and temperature. A mass air flow sensor continuously measures the inducted air and makes rapid adjustments for changes in air temperature and density, to balance fuel economy, emissions, and engine power requirements. Heated oxygen sensor This is an emission control system designed to reduce emissions and improve fuel economy. The heated oxygen sensor monitors the composition of the exhaust gases leaving the engine. The exhaust gas analysis is fed into an electronic module. This adjusts the air/fuel ratio to improve combustion and reduce the three major pollutants (hydrocarbons, carbon monoxide, and oxides of nitrogen (NOx)) via a three-way catalytic converter. Crankcase ventilation The engine is provided with positive crankcase ventilation which prevents crankcase gases from being released into the atmosphere. Instead, the crankcase gases are routed to the intake manifold and cylinders. PremAir® On the surface of the radiator in the engine compartment, there is a special coating called PremAir®. PremAir® works as a catalytic converter, converting most of the ozone passing through the radiator into oxygen, thereby reducing harmful ground-level ozone. Evaporative control system The car is equipped with an evaporative control system, which prevents gasoline vapor from being released into the atmosphere. The system consists of a fuel tank with filler pipe and cap, two rollover valves, a Fill Limit Vent Valve (FLVV), vapor vent lines, a charcoal canister, a purge line, and a purge control valve and engine connections. In addition, there is a pressure sensor connected to the fuel tank and a filter-protected Canister Close Valve (CCV) on the atmospheric side of the canister, for system diagnosis. The gasoline vapor is channeled through the rollover valves and the FLVV via the vapor vent lines into the charcoal canister, where it is stored. When the engine is started, the gasoline vapor is drawn from the file:///K|/ownersdocs/2004/2004_V70/04v70_08b.htm (1 of 16)12/30/2006 4:32:07 PM

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