Adjustments On Car; Periodic Service; Overhaul And Adjustment - Pontiac FIREBIRD 1972 Service Manual

6B-44 1972 PONTIAC SERVICE MANUAL
continues until the choke valve is wide open. At this point
the fast idle screw is on the lowest step of the fast idle cam
and the engine is warm enough to run at normal idle
speeds. A/C or
Non A/C
Calif. or
Non Calif.
Carburetor
Model Number
Engine-Trans.
A choke unloader is provided should the engine become
flooded during starting. The choke can be opened manu-
ally by depressing the accelerator pedal to the floor. This
opens the choke valve sufficiently to lean out the mixtures
so that the engine will start.
Both
Both
Both
Both
Non Calif.
Calif.
Non Calif.
Both
400 2 Bbl. Auto.
400 2 Bbl. Auto.
350 2 Bbl. Auto.
455 2 Bbl. Auto
2GV 1 114 (VENTURA 11)
I I I
7042100
I
I
Non Calif.
1
307 Auto.
1
7042101
Non Calif. 307 Man.
I
ADJUSTMENTS O N CAR
All Rochester 2GV adjustments can be performed on the
car. With the exception of idle speed and mixture adjust-
ment (outlined in Section 6D), all adjustments are in-
cluded in the OVERHAUL AND ADJUSTMENTS
procedure.
488062
they will operate freely. DO NOT OIL CHOKE VALVE
SHAFT OR ANY PART O F THE LINKAGE.
I I
WGD CARTER
Both
1
Both
I
350 Man.
The integral fuel filter in the carburetor air horn should
be cleaned and replaced periodically. Normal recommen-
dations are that it be cleaned or replaced during the nor-
mal engine tune-up or between approximately 10,000 to
12,000 miles. This will, of course, vary dependent upon
fuel contamination.
PERIODIC SERVICE
There are no periodic services required on the 2GV carbu-
retor; however, choke linkage, choke valve and levers and
pump linkage should be kept free of dirt and gum so that
OVERHAUL AND ADJUSTMENT
Flooding, stumble on acceleration and other performance
complaints are, in many instances, caused by presence of
dirt, water or other foreign matter in carburetor. To aid
in diagnosing the cause of complaint, the carburetor
should be carefully removed from engine without draining
fuel from bowl. The contents of fuel bowl may then be
examined for contamination as carburetor is disassem-
bled.
CHOKE
VALVE
The following is a step-by-step sequence by which the
2GV carburetors may be completely disassembled and
reassembled. Adjustments may be made and various parts
of the carburetor may be serviced without completely
disassembling the entire unit.
OUTER
PUMP
ARM
BOWL COVER
I
PUMP PLUNGER
ASSEMBLY
I
--.--
FLOAT
DISASSEMBLE
1. Remove fuel inlet filter retainer nut and gasket and
remove filter (Fig. 6B-58).
.
- - -
Fig. 6 8 - 5 8
Air Horn Assembly