Emission Controls; Sources Of Emissions; The Clean Air Act; Crankcase Emission Control System - Honda 1990 Civic Sedan Owner's 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.
Honda Motor Co., Ltd. has developed a number of systems which
are highly effective in reducing carbon monoxide, oxides of nitrogen
and hydrocarbons.

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
operation of each system is explained on the following pages.
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 PCV valve and intake
manifold, into the combustion chamber.
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