Emission Controls - Acura 1995 NSX Online Reference Owner's Manual

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The burning of gasoline in your car's
engine produces several byproducts.
Some of these are carbon monoxide
(CO), oxides of nitrogen (NOx) and
hydrocarbons (HC). Gasoline evapo-
-ating from the tank also produces
hydrocarbons. Controlling the
production of NOx, CO, and HC is
important to the environment. Under
certain conditions of sunlight and
climate, NOx and HC react to form
photochemical "smog." Carbon
monoxide does not contribute to
smog creation, but it is a poisonous
gas.
Table of Contents
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 emis-
sion controls work. Scheduled
maintenance is on page 138.
* In Canada, Acura vehicles comply
with the Canadian Motor Vehicle
Safety Standards (CMVSS) on
Emissions valid at the time they are
manufactured.

Emission Controls

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 t h e
atmosphere. The Positive Crankcase
Ventilation valve routes t h e m 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 t h e fuel
tank, a 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