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E E m m i i s s s s i i o o n n C C o o n n t t r r o o l l S S y y s s t t e e m m
Emission Control System
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In the interest of clean air
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Pollution of our environment has become a prob-
lem that is of increasing concern to all of us. We
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urge you to join us in our efforts for cleaner air in
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controlling the pollutants emitted from the
automobile.
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Porsche has developed an emission control sys-
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tem that controls or reduces those parts of the
emission that can be harmful to our environment.
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Your Porsche is equipped with such a system.
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Porsche warrants the Emission Control System in
your new vehicle under the terms and conditions
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set forth in the Warranty Booklet.
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You, as the owner of the vehicle, have the respon-
sibility to provide regular maintenance service for
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the vehicle and to keep a record of all maintenance
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work performed. To facilitate record keeping, have
the service performed by authorized Porsche
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dealers. They have Porsche trained technicians
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and special tools to provide fast and efficient
service.
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To assure efficient operation of the
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Emission Control System:
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e Have your vehicle maintained properly and in
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accordance with the recommendations de-
scribed in your Maintenance Booklet. Lack of
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proper maintenance, as well as improper use
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of the vehicle, will impair the function of the
emission control system and could lead to
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damage.
e Do not alter or remove any component of the
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emission control system.
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e Do not alter or remove any device, such as heat
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shields, switches, ignition wires, valves, etc.,
which are designed to protect your vehicle's
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emission control system. In addition to serious
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engine damage, this can result in a fire if ex-
cess raw fuel reaches the exhaust system.
e Do not continue to operate your vehicle if you
detect engine misfire or other unusual operat-
ing conditions.
How Emission Control Works
When an automobile engine is running, it uses en-
ergy generated through the combustion of a mix-
ture of air and fuel. Depending on whether a
vehicle is driven fast or slowly or whether the en-
gine is cold or hot, some of the fuel (hydrocarbons)
may not be burned completely, but may be dis-
charged into the engine crankcase or exhaust sys-
tem. Additonal hydrocarbons may enter the
atmosphere through evaporation of fuel from the
fuel tank. These hydrocarbons (HC), when re-
leased into the air, contribute to undesirable
pollution.
In addition, carbon monoxide (CO) and oxides of
nitrogen (NOx) contribute to engine emissions.
They, too, are formed during the combustion
process and discharged into the exhaust system.
To reduce these pollutants, your Porsche is equip-
ped with a precisely calibrated fuel injection sys-
tem to assure a finely balanced air/fuel mixture
under all operating conditions.
Oxygen sensor
The oxygen sensors, installed in the exhaust pipe
continuously sense the oxygen content of the ex-
haust and signal the information to an electronic
control unit. The control unit corrects the air/fuel
ratio, so the engine always receives an accurately
metered air/fuel mixture.
Crankcase ventilation
Through crankcase ventilation, undesirable emis-
sions from the engine crankcase are not permitted
to reach the outside atmosphere. These emissions
are recirculated from the crankcase to the air in-
take system. From here the emissions mix with the
intake air and are later burned in the engine.
Catalytic converters
The catalytic converters are efficient "clean-up"
devices built into the exhaust system of the ve-
hicle. The catalytic converters burn the undesir-
able pollutants in the exhaust gas before it is
released into the atmosphere.
The exclusive use of unleaded fuel is critically
important for the life of the catalytic convert-
ers. Therefore, only unleaded fuel must be
used.
The catalytic converters will be damaged by:
– Push or tow starting the vehicle,
– Misfiring of the engine,
– Turning off the ignition while the vehicle is
moving,
– Driving until the fuel tank is completely empty,
– By other unusual operating conditions.
e Do not continue to operate your vehicle under
these conditions, since raw fuel might reach
the catalytic converters. This could result in
overheating of the converters. Federal law pro-
hibits use of leaded fuel in this vehicle.
Fuel Economy
Fuel economy will vary depending on where, when
and how you drive, optional equipment installed,
and the general condition of your vehicle.
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