Pontiac FIREBIRD 1972 Service Manual page 744

SECTION 6D
EMISSION CONTROL SYSTEMS
CONTENTS OF THIS SECTION
Introduction
..........................................................
6D-1
Closed Positive Crankcase Ventilation System
....
6D-1
Periodic Service
..................................................
6D-2
Auto-Therm Air Cleaner
......................................
6D-3
Check Out and System Servicing
......................
6D-3
Periodic Service
..................................................
6D-4
Controlled Combustion System
............................
6D-5
T.C.SA3.C.S. System
........................................
6D-7
Ignition and Curb Idle Setting Procedures
........
6D-10
Evaporation Control System
..............................
6D- 11
Dwell and Ignition Timing Specifications
............
6D-9
Idle Speed Chart
..................................................
6D- 10
Air Injection Reactor System
........................................
General Description 6D- 14
Minor Service
........................................
6D-15
Drive Belt
................................................
6D-15
Inspection
..............................................
6D- 15
Adjustment
..........................................
6D- 15
Replacement
........................................
............................................
Pump Pulley
........................................
Replacement
A.I.R. Hoses and Tubes
..........................
Inspection..
............................................
Replacement
........................................
Check Valve(s)
........................................
Inspection..
............................................
Replacement
...........
I . .
..........................
Diverter Valve
..........................................
............................................
Inspection..
........................................
Replacement
..................................
Air Injection Tube
..............................................
Inspection
........................................
Replacement
Air Injection Pump
..................................
Inspection..
............................................
Pressure Relief Valve Replacement
....
INTRODUCTION
There are two types of emissions to be controlled: crank-
case emissions and exhaust emissions. Crankcase emis-
sions are controlled by use of the closed Positive
Crankcase Ventilation (P.C.V.) system. Exhaust emis-
sions are controlled by the use of the Engine Controlled
Combustion System (C.C.S.).
Federal law requires that the emissions of unburned hy-
drocarbons and carbon monoxide in motor vehicle ex-
haust systems be controlled to certain prescribed
maximums under specific test conditions. The law further
requires that a closed crankcase ventilation system be
used.
CLOSED POSITIVE CRANKCASE
VENTILATION SYSTEM
The closed P.C.V. system which is standard on all models
helps control air pollution caused by crankcase blow-by
gases. With this system, blow-by gases are redirected into
the engine for reburning.
Periodic inspection and required servicing of the P.C.V.
system will assure a cleaner, better performing, longer
lasting engine and will assure elimination of crankcase
blow-by gases.
Fig. 6D-1 PCV Valve Location (V-8 except 307)