Acura 2008 RL User Manual download pdf (Page 476)

The exhaust emissions 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

come out the tailpipe. The exhaust

emissions control systems are

separate from the crankcase and

evaporative emissions control

systems.

The PGM-FI system uses sequential

multiport fuel injection.

It has three subsystems: air intake,

engine control, and fuel control. The

powertrain control module (PCM)

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.

This system constantly adjusts the

ignition timing, reducing the amount

of HC, CO, and NOx produced.

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.

The emissions 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

Acura replacement parts or their

equivalent for repairs. Using lower

quality parts may increase the

emissions from your vehicle.

The emissions control systems are

covered by warranties separate from

the rest of your vehicle. Read your

warranty manual for more informa-

tion.The three way catalytic converters

are in the exhaust system. Through

chemical reactions, they convert HC,

CO, and NOx in the engine’s exhaust

to carbon dioxide (CO ), nitrogen

(N ), and water vapor.

2

2

Exhaust Emissions Controls Replacement Parts

PGM-FI System

Ignition Timing Control System

Exhaust Gas Recirculation (EGR)

System

Three Way Catalytic Converter

Emissions Controls

Technical Information

473

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