Acura 1995 NSX Online Reference Owner's Manual page 234

Main Menu
Emission Controls
Exhaust Emission Controls
The exhaust emission controls
include four systems: PGM-FI,
Ignition Timing Control, Exhaust Gas
Recirculation, and Three Way
Catalytic Converter. These four
systems work together to control the
engine's combustion and minimize
the amount of HC, CO, and NOx that
comes out the tailpipe. The exhaust
emission control systems are sepa-
rate from the crankcase and evapora-
tive emission control systems.
PGM-FI System
The PGM-F1 System uses sequential
multiport fuel injection. It has three
subsystems: Air Intake, Engine
Control, and Fuel Control. The
Engine Control Module (ECM) uses
various sensors to determine how
much air is going into the engine. It
then controls how much fuel to inject
under all operating conditions.
Technical Information
Table of Contents
Ignition Timing Control
System
This system constantly adjusts the
ignition timing, reducing the amount
of HC and NOx produced.
Exhaust Gas Recirculation
(EGR) System
The Exhaust Gas Recirculation
(EGR) system takes some of the
exhaust gas and routes it back into
the intake manifold. Adding exhaust
gas to the air/fuel mixture reduces
the amount of NOx produced when
the fuel is burned.
Three Way Catalytic Converter
The three way catalytic converter is
in the exhaust system. Through
chemical reactions, it converts HC,
CO, and NOx in the engine's exhaust
to carbon dioxide (CO
(N ), and water vapor.
2
Replacement Parts
The emission control systems are
designed and certified to work
together in reducing emissions to
levels that comply with the Clean Air
Act. To make sure the emissions
remain low, you should use only new
Genuine Acura replacement parts or
their equivalent for repairs. Using
lower quality parts may increase the
emissions from your car.
The emissions control systems are
covered by warranties separate from
the rest of your car. Read your
warranty manual for m o r e informa-
tion.
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2