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Emission Controls
The burning of gasoline in your
car's engine produces several by-
products. Some of these are carbon
monoxide (CO), oxides of nitrogen
(NOx) and hydrocarbons (HC).
Gasoline evaporating from the tank
also produces hydrocarbons. Con-
trolling the production of NOx, CO,
and HC is important to the environ-
ment. Under certain conditions of
sunlight and climate, NOx and HC
react to form photochemical "smog."
Carbon monoxide does not contri-
bute to smog creation, but it is a
poisonous gas.
The Clean Air Act
The United States Clean Air Act*
sets standards for automobile
emissions. It also requires that
automobile manufacturers explain
to owners how their emission
controls work and what to do to
maintain them. This section
summarizes how the emission con-
trols work. Scheduled maintenance
is on page 129.
* In Canada, Honda vehicles
comply with the Canadian Motor
Vehicle Safety Standards (CMVSS)
for Emissions valid at the time they
are manufactured.
Crankcase Emission Control
System
Your car has a Positive Crankcase
Ventilation System. This keeps
gasses that build up in the engine's
crankcase from going into the
atmosphere. The Positive Crank-
case Ventilation valve routes them
from the crankcase back to the
intake manifold. They are then
drawn into the engine and burned.
Evaporative Emission
Control System
As gasoline evaporates in the fuel
tank, an evaporative emission
control canister filled with charcoal
adsorbs the vapor. It is stored in
this canister while the engine is off.
After the engine is started and
warmed up, the vapor is drawn into
the engine and burned during
driving.
Technical Information
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