Porsche 911 2020, Руководство пользователя

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Emission Control System
121
Emission Control System
In the interest of clean air
Pollution of our environment has become a problem
that is of increasing concern to all of us. We urge you
to join us in our efforts for cleaner air in controlling
the pollutants emitted from the automobile.
Porsche has developed an emission control system
that controls or reduces those parts of the emission
that can be harmful to our environment. Your Por-
sche is equipped with such a system.
Porsche warrants the Emission Control System in
your new vehicle under the terms and conditions set
forth in the Warranty Booklet.
You, as the owner of the vehicle, have the responsi-
bility to provide regular maintenance service for the
vehicle and to keep a record of all maintenance work
performed. To facilitate record keeping, have the
service performed by authorized Porsche dealers.
They have Porsche trained technicians and special
tools to provide fast and efficient service.
To assure efficient operation of the Emission
Control System:
e
Have your vehicle maintained properly and in
accordance with the recommendations de-
scribed in your Maintenance Booklet. Lack of
proper maintenance, as well as improper use of
the vehicle, will impair the function of the emis-
sion control system and could lead to damage.
e Do not alter or remove any component of the
emission control system.
e Do not alter or remove any device, such as heat
shields, switches, ignition wires, valves, etc.,
which are designed to protect your vehicle's
emission control system. In addition to serious
engine damage, this can result in a fire if excess
raw fuel reaches the exhaust system.
e Do not continue to operate your vehicle if you
detect engine misfire or other unusual operating
conditions.
How Emission Control Works
When an automobile engine is running, it uses en-
ergy generated through the combustion of a mixture
of air and fuel. Depending on whether a vehicle is
driven fast or slowly or whether the engine is cold or
hot, some of the fuel (hydrocarbons) may not be
burned completely, but may be discharged into the
engine crankcase or exhaust system. Additonal hy-
drocarbons may enter the atmosphere through
evaporation of fuel from the fuel tank. These hydro-
carbons (HC), when released into the air, contribute
to undesirable pollution.
In addition, carbon monoxide (CO) and oxides of ni-
trogen (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 equipped with a precisely
calibrated fuel injection system 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 intake
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” de-
vices built into the exhaust system of the vehicle.
The catalytic converters burn the undesirable pollu-
tants in the exhaust gas before it is released into the
atmosphere.
The exclusive use of unleaded fuel is critically im-
portant for the life of the catalytic converters.
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 over-
heating of the converters. Federal law prohibits
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.
A vehicle tuned to specifications and correctly
maintained, will help you to achieve optimal fuel
economy.
e
Have your vehicle tuned to specifications.
– Air cleaner should be dirt free to allow proper
engine “breathing”.
– Battery should be fully charged.