Pontiac tempest 1968 Service Manual page 348

EMISSION C O N T R O L SYSTEMS
6D-3
1. With carburetor mixture screws backed out 5
turns and idle stop solenoid active set the idle stop
solenoid screw to obtain ' A 9 r p m . (Fig. 6D-2).
2. Turn mixture screws clockwise to obtain 'B'
rpm, idle stop solenoid s t i l l active. Do not readjust
idle stop solenoid screw.
3. With Idle stop solenoid inactive, adjust the idle
speed screw on the carburetor to obtain 'C rpm
(solenoid Inactive speed). Do not readjust mixture or
solenoid screws.
Procedure for setting fast idle - with transmission
in neutral, choke valve fully open and fast idle lever
on the top step of the fast idle cam.
1. Bend fast idle tang on throttle lever of one
b a r r e l manual transmission carburetor.
2. Adjust f a s t Idle s c r e w on f o u r b a r r e l
carburetor.
NOTE: Curb idle on auto-matic transmission
cars to be set in drive with A/C turned off (where
fitted).
NOTE: It is important that the idle and timing
specifications are strictly adhered to in order to
ensure proper control of exhaust emissions.
The accuracy of the tachometer used for idle ad­
justments should be checked periodically by an
authorized representative.
DWELL AND IGNITION
TIMING
S P E C I F I C A T I O N S
Dwell Point Gap * Ignition Timing
6 Cyl (1 Bbl) 33° All engines- 0° TDC
6 Cyl (4 Bbl) 33° .019" New 5° BTDC
All V-8 30° .016" Used 9° BTDC
NOTE: Ignition timing to be checked with both
hoses to distributor vacuum unit disconnected and
idle stop solenoid disconnected (solenoid inactive
speed).