Pontiac FIREBIRD 1972 Service Manual page 752

EMISSION CONTROL SYSTEMS 6D-9
No maintenance is required of any components in the
T.C.S./S.C.S./C.E.C. systems. If any component is not
functioning properly, it should be replaced.
IGNITION TIMING
Set timing as specified with vacuum advance hose discon-
nected and plugged, and idle speed as specified (Fig. 6D-
15).
E N G I N E D W E L L P O I N T G A P
6 Cyl. 3 2
'/zO
- + t
V-8 Manual
(except 307)
1
3 9 :
1
A l l Engines
V-8 Automatic
.O19" (New)
(except 307) .016" (Used)
307 Manual 30'
307 Automatic 30'
I G N I T I O N
4' B.T.D.C.
I
4' B.T.D.C.
F i g . 6 D - 1 5 D w e l l a n d I g n i t i o n T i m i n g S p e c i f i c a t i o n s
SOLENOID
1
S.C.S. S O L E N O I D E N E R G I Z E D , P R O V I D I N G N O V A C U U M A D V A N C E B E L O W 38 MPk
D U R I N G N O R M A L O P E R A T I N G T E M P E R A T U R E .
1 T.C.S. SOLENOID ENERGIZED, PROVIDING N O VACUUM ADVANCE I N ALL TRANSMISSION
RANGES BUT HlGH GEAR DURING NORMAL OPERATING TEMPERATURE.
(BETWEEN 85°F AND 220°F)
2
S C S S O L E N O I D D E E N E R G I Z E D , A L L O W ~ N G F U L L V A C U U M A D V A N C E A B O V E
38 MPH D U R I N G N O R M A L O P E R A T I N G T E M P E R A T U R E A N D A T A L L T I M E S D U R I N G
P E R I O D S O F A B N O R M A L O P E R A T I N G T E M P E R A T U R E
2 T.C.S. SOLENOID DE-ENERGIZED, ALLOWING FULL VACUUM ADVANCE I N HlGH GEAR
DURING NORMAL OPERATING TEMPERATURE AND ALL MODES OF TRANSMISSION OPERATION
DURING PERIODS OF ABNORMAL ENGINE OPERATING TEMPERATURE.
(BELOW 85°F AND ABOVE 220°F)
F i g . 6 D - 1 4 T.C.S/S.C.S. S y s t e m
-
V a c u u m R o u t i n g