owners manual Volvo S90

owners manual Volvo S90 - year of production: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 - Volvo S90 V90 960 owners manual EN

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text version of content this owner's manual page from owners manual to the vehicle Volvo S90, year of production 1990 - 1998:

1998 Volvo S90 SFI is all-electronic and microprocessor-Air pump system controlled. It can continually compensate for variations in engine load, speed and temperature During cold starts, an electric pump is activated to give the best economy and power. An which directs air to the exhaust channels. This important feature of the system is a mass air flow initiates a secondary combustion of exhaust gases sensor that measures the mass of the inducted air which helps minimize hydrocarbon and carbon instead of the volume. In this way the system can monoxide levels and reduces warm-up time for make instantaneous adjustments for changes in air the three-way catalytic converter. The pump temperature or density, thus always assuring the begins to function when the engine is started. It best economy with the lowest possible exhaust remains in operation until the three-way catalytic emissions. converter has reached normal operating temperature. A sound may be audible from the air Heated oxygen sensor pump during this warm-up period. This is normal. When idling, the air pump performs a self- This is an emission control system designed to diagnosis. A soft whining noise can be heard, reduce emissions and improve fuel economy. The which is also normal. heated oxygen sensors monitor 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) by a three-way catalytic converter. Emissions systems pg. 113 Evaporative control system (EVAP) The engine is equipped with a fuel evaporation system which prevents the emission of fuel vapor file:///K|/ownersdocs/1998/1998_SV90/98S90_108.htm (5 of 6)12/30/2006 1:52:49 PM

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year of production from: 1990

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