1993 Honda Accord Owner's Manual - Page 163

1993 Honda Accord Manual

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Emission Controls Sources of Emissions The combustion process produces carbon monoxide, oxides of nitrogen, and hydrocarbons. The evaporation of fuel in the fuel tank also produces hydrocarbons. Control of oxides of nitrogen and hydrocarbons is very important since, under certain conditions, when subjected to sunlight, they react to form photochemical smog. Carbon monoxide does not react to form smog, but it is toxic. The Clean Air Act The Clean Air A c t * requires all vehicle manufacturers to explain in writing the operation and maintenance of their emission control systems. Maintenance instructions are included on pages 110-112; the operation of each system is explained below and on the following page. Replacement Parts The emission control systems on your new Honda were designed, built and certified to conform with the Federal regulations implementing the Clean Air Act. Honda recommends only the use of new, Genuine Honda parts or their equivalent. The use of other replacement parts which are not of equivalent quality may impair the effectiveness of your car's emission control systems. Crankcase Emission Control System To prevent crankcase emissions, your car is equipped with a Positive Crankcase Ventilation (PCV) System which routes blowby gases from the crankcase, through the Positive Crankcase Ventilation valve and intake manifold, into the combustion chamber. Evaporative Emission Control System The Evaporative Emission Control System is designed to prevent fuel vapors from escaping into the atmosphere. Fuel vapors from the fuel tank are directed into the evaporative emission control canister where they are adsorbed and stored while the engine is stopped or idling. When the engine coolant temperature rises to a certain value, the vapors are drawn into the engine through the throttle body and the intake manifold during normal engine operation. * In Canada, Honda vehicles comply with the Canadian Motor Vehicle Safety Standards (CMVSS) on Emissions valid at the time they are manufactured. (cont'd)

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Emission Controls
Sources of Emissions
The combustion
process
produces carbon
monoxide,
oxides of
nitrogen, and hydrocarbons. The evaporation of fuel in the fuel tank
also
produces hydrocarbons. Control of oxides of
nitrogen and
hydrocarbons
is very
important
since,
under
certain
conditions,
when subjected to sunlight, they react to form photochemical smog.
Carbon monoxide does not react to form smog, but it is toxic.
The Clean Air Act
The Clean Air Act* requires all vehicle manufacturers to explain in
writing the operation and maintenance of their emission control
systems.
Maintenance instructions are included on pages
110
—
112
; the
operation of each system is explained below and on the following
page.
Replacement Parts
The emission control systems on your new Honda were designed,
built
and
certified
to
conform
with
the
Federal
regulations
implementing the Clean Air Act. Honda recommends only the use of
new, Genuine Honda parts or their equivalent. The use of other
replacement parts which are not of equivalent quality may impair
the effectiveness of your car's emission control systems.
Crankcase Emission Control System
To
prevent
crankcase
emissions,
your
car
is
equipped
with
a
Positive Crankcase Ventilation (PCV) System which routes blowby
gases
from
the
crankcase,
through
the
Positive
Crankcase
Ventilation valve and intake manifold, into the combustion chamber.
Evaporative Emission Control System
The Evaporative Emission Control System is designed to prevent
fuel vapors from escaping into the atmosphere.
Fuel vapors from the fuel tank are directed into the evaporative
emission control canister where they are adsorbed and stored while
the
engine
is
stopped
or
idling.
When
the
engine
coolant
temperature rises to a certain value, the vapors are drawn into the
engine through the throttle body and the intake manifold during
normal engine operation.
* In Canada, Honda vehicles comply with the Canadian
Motor
Vehicle Safety Standards (CMVSS) on Emissions valid at the time
they are manufactured.
(cont'd)