owners manual Volvo C70

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1998 C70 pg. 112 Fuel/emissions systems Fuel System The fuel system is all-electronic and is microprocessor-controlled. It can continually compensate for variation in engine load, speed and temperature to give the best economy and power. A mass air flow sensor measures the inducted air. In this way the system can make instantaneous adjustments for changes in air temperature or density, thus always assuring the best economy with the lowest possible exhaust emissions. 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 provide optimum conditions for combustion and efficient reduction of the three major pollutants (hydrocarbons, carbon monoxide and oxides of nitrogen (NOx) by a three-way catalytic converter. Secondary Air Injection (certain models) This system adds air to the hot exhaust gases as they are expelled from the engine. This causes a secondary combustion of residual hydrocarbons and carbon monoxide, resulting in lower emissions levels in the exhaust gases. A - Inlet manifold , B - EVAP valve , C - Charcoal canister , D - Roll over valve , E - Line to fuel tank file:///K|/ownersdocs/1998/1998_C70/98c70_33.htm (1 of 5)12/30/2006 1:49:19 PM

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