Emissions (cont'd)
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.
Engine Exhaust Controls
The engine exhaust emission control systems are designed to control
combustion during idle, acceleration, cruise, and deceleration. These
systems are entirely separate from the crankcase and evaporative
emission control systems described previously.
PGM-FI System
The PGM-FI system consists of three independent sub-systems; Air
Intake, Electronic Control and Fuel Control, thus allowing more
accurate control of air/fuel ratios under all operating conditions.
The Electronic Control Unit (ECU) detects the amount of air drawn
into the cylinders and determines the amount of fuel to be injected
to provide the optimum air/fuel ratio for all engine needs.
Ignition Timing Control System
This system automatically controls the ignition timing to reduce
the amount of HC and NO
X
.
Catalytic Converter
The catalyst is used to convert hydrocarbons (HC), carbon
monoxide (CO) and oxides of nitrogen (NO
X
) in the exhaust gas, to
carbon dioxide (CO
2
), dinitrogen (N
2
) and water vapor.
Exhaust Gas Recirculation (EGR)
The EGR system is designed to control the formation of oxides of
nitrogen (NO
X
) caused when fuel the mixture burns at high
temperature. It works by recirculating exhaust gas through the
EGR valve and intake manifold into the combustion chambers
where it reduces peak temperature by diluting the air/fuel
mixture.
Summary of Contents for 1991 Accord Wagon
Page 90: ...Maintenance Schedule cont d...
Page 131: ...page 105...
