Choke Rod Adjustment; Vacuum Break Adjustment; Unloader Adjustment; Choke Coil Rod Adjustment - Pontiac Grand Prix Service Manual

6B-12 1969
PONTIAC SERVICE MANUAL
CHOKE ROD ADJUSTMENT
With fast idle adjustment made (Fig. 6B-23)
1. Place fast idle cam follower on second step of the
fast idle cam and hold firmly against the rise to the
high step.
2. Rotate choke valve towards direction of closed
choke by applying force to choke coil lever.
3. Bend choke rod at point shown to give specified
opening between the lower edge of choke valve (at
center of valve) and inside air horn wall.
VACUUM BREAK ADJUSTMENT (Fig. 68-24)
1. Open throttle valve so that cam follower on throttle
lever will clear highest step on fast idle cam.
2. Rotate choke valve to closed position. If thermo-
static coil is warm, hold choke valve closed with rubber
band or spring attached between choke shaft lever and
stationary part of carburetor.
3. Grasp vacuum breaker plunger rod with needle nose
pliers and push straight inward until diaphragm seats.
4. With specified plug gauge, measure clearance
between lower edge of choke valve and inside air horn
wall at center of valve as shown.
5. Bend end of vacuum break lever at point shown to
adjust.
UNLOADER ADJUSTMENT (Fig. 68-25)
1. Hold choke valve in closed position by applying a
light force to the choke coil lever.
GAUOE. BETWEEN
CAM FOUOWER WST
BE
HEU)
FIRMLY ON
Fig. 6B-24
Vacuum Break Adjustment
2. Rotate throttle lever to wide open throttle valve
position.
3. Bend unloader tang on throttle lever to obtain
specified dimension between lower edge of choke
valve (at center) and air horn wall.
,
CHOKE COIL ROD ADJUSTMENT (Fig. 68-26)
1. Hold choke valve closed.
2. Pull upward on coil rod to end of travel.
Fig. 68-23
Choke
Rod
Adjustment
Fig. 68-25 Unloader Adjustment