Disassembly Of Throttle Body - Pontiac Grand Prix Service Manual

E N G I N E FUEL
6B-15
\
-
& - -
.?/
SCREEN
Fig. 68-31 Float Bowl Assembly
2. Remove fast idle screw from throttle lever if
necessary to replace.
CLEANING AND INSPECTION
Dirt, gum, water or carbon contamination in or on
exterior moving parts of a carburetor are often
responsible for unsatisfactory performance. For this
reason, efficient carburetion depends upon careful
cleaning and inspection while servicing.
1. Thoroughly clean carburetor casting and metal parts
in clean cleaning solvent.
CA UTION: Vacuum break unit, gaskets, and pump
plunger should not be immersed in solvent. Clean pump
plunger in clean gasoline only.
2. Blow all passages in castings (Fig. 6B-33 through 6B
47) dry with compressed air and blow off all parts until
they are dry.
CAUTION: Do not pass drills or wires through
9' Remove retainer
On
pump
remove
calibrated jets or passages as they may enlarge orifices
plunger from Pump arm' The Pump lever andseriously a f / t calibration.
and shaft may be removed by loosening set screw on
inner arm and removing outer lever and shaft.
3. Check all Darts for wear. If wear is noted. defective
10. The cover gasket may now be removed.
parts must b;replaced. Not@ especially the following:
a. Check float needle and seat for wear. If wear is
11. Remove two choke valve attaching screws, then
noted, the assembly must be replaced.
remove choke valve.
12. Remove choke valve shaft from bowl cover.
DISASSEMBLY OF BOWL
1. Remove pump inlet filter screen and pump plunger
return spring, and remove aluminum check ball from
bottom pump well (Fig. 6B-3 1).
2. Remove main metering jets and power valve (Fig.
6B-3 1).
3. Remove three screws holding cluster to bowl and
remove cluster and gasket.
4. Using a pair of long nose pliers, remove pump
discharge spring retainer (Fig. 6B-32). Then spring
and check ball may also be removed.
5. Invert carburetor and remove three large bowl to
throttle body attaching screws. Throttle body and
gasket may now be removed.
6. Remove fast idle cam and fast idle link as an
assembly. DO NOT disassemble.
DISASSEMBLY OF THROTTLE BODY
1. Remove idle adjusting needles and springs.
Fig. 68-32 Removing Pump Discharge Spring
Retainer