Acura 2013 MDX - Manual (Page 592)

The burning of gasoline in your
vehicle's engine produces several
byproducts. Some of these are
carbon monoxide (CO), oxides of
nitrogen (NOx), and hydrocarbons
(HC). Gasoline evaporating 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.
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 emissions
controls work and what to do to
maintain them. This section
summarizes how the emissions
controls work. Scheduled
maintenance is on page
514.
ᤳ In Canada, Acura vehicles comply with the
Canadian emission requirements, as specified in
an agreement with Environment Canada, at the
time they are manufactured.
Crankcase Emissions
Control System
Your vehicle has a positive crankcase
ventilation system. This keeps
gasses that build up in the engine's
crankcase from going into the
atmosphere. The positive crankcase
ventilation valve routes them from
the crankcase back to the intake
manifold. They are then drawn into
the engine and burned.
Evaporative Emissions
Control System
As gasoline evaporates in the fuel
tank, an evaporative emissions
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.
CONTINUED
Emissions Controls
587
12/07/17 18:10:57 13 ACURA MDX MMC North America Owner's M 50 31STX660 enu
2013 MDX
Technical
Information