Pontiac Grand Prix Service Manual page 350

ENGINE FUEL
6B-19
FAST IDLE CAM
AlNST HIGH STEP
Fig. 68-43 Choke Rod Adjustment
CHOKE ROD ADJUSTMENT
(Fig.
68-43)
Place idle screw on second step of fast idle cam against
shoulder of high step. While holding screw in this
position, gauge between upper edge of choke valve
and air horn wall. Adjust to specified dimension by
bending tang on choke lever and collar assembly.
After the carburetor is assembled, the following
adjustments must be checked.
VACUUM BREAK ADJUSTMENT
(Fig.
68-44)
With vacuum break diaphragm seated and choke
valve closed so the vacuum break rod is at the end of
PLACE GAUGE BETWEEN UPPER
EDGE O F CHOKE VALVE AND AIR
SH DIAPHRAGM
UNGER IN UNTIL
Fig. 68-44 Vacuum Break Adjustment
GAUGE BETWEEN UPPER
EDGE OF CHOKE VALVE
AND AIR HORN CASTING,
I
column x
3")
w
Fig. 68-45 Unloader Adjustment
the slot in the choke shaft lever, gauge between the
upper edge of the choke valve and inside wall of the
air horn casting. To adjust, bend the vacuum break
rod.
UNLOADER ADJUSTMENT (Fig. 68-45)
With the throttle valves held wide open the choke
valve should be open enough to admit the specified
gauge between the upper edge of the choke valve and
inner air horn wall. Bend tang on throttle lever to
adjust.
CHOKE COIL ROD ADJUSTMENT (Fig. 68-46)
'o adjust, disconnect the upper end of the choke coil
Fig. 6B-46 Choke Coil Rod Adjustment