Acura 2012 RDX User Manual download pdf (Page 493)

The burning of gasoline in your

vehicle'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.

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

418.

ᤳ

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.

Emissions Controls

487

Technical Information

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