Idle Solenoid; Carburetor Replacement - GMC G Service Manual

3. Electrical connector.
• Start the engine and check the operation of the
choke.
4. Air cleaner.

IDLE SOLENOID

\}? \ Inspect
1. Turn on the engine control switch, but do not start the
engine.
2. Open the throttle to allow the solenoid plunger to
extend.
3. Hold the throttle lever wide open, feel the end of the
plunger and disconnect the wire at the solenoid.
4. Plunger should move. Some spring tension should be
felt.
5. If the plunger did not move, back out 1/8 hex screw
(counterclockwise) one full turn and repeat steps 3
and 4.
6. If the plunger moves in step 5, connect the wire to the
solenoid and adjust the idle speed.
7. If the plunger did not move in step 5, insert test light
(1893 bulb or smaller) between the solenoid feed wire
and ground.
8. If the light lights, replace the solenoid.
9. If the light does not light, locate the cause of the open
circuit in the solenoid feed wire.
l* + | Remove or Disconnect
1. Air cleaner.
2. Electrical connector from the solenoid.
3. Solenoid from the float bowl assembly.
H Install or Connect
1. Solenoid.
• Hold the choke valve wide open so the fast idle
cam follower clears the fast idle cam.
• Turn the solenoid until it contacts the lever tang.
2. Electrical connector.
3. Air cleaner.
• Check and adjust the idle speed.

CARBURETOR REPLACEMENT

Flooding, stumbling on acceleration and other perfor­
mance complaints are, in many instances, caused by the
presence of dirt, water or other foreign matter in the carbu­
retor. To aid in diagnosing the cause, the carburetor should
be removed carefully from the engine without draining fuel
from the bowl. Contents of the fuel bowl may then be exam-
ined for foreign m aterials as the carburetor is
disassembled.
H Remove or Disconnect (Figure 11)
1. Air cleaner assembly.
2. Fuel and vacuum lines from the carburetor.
• Make note of the vacuum hose routing.
CARBURETORS 6C1-19
Figure 11 — Carburetor Replacement
3. Electrical connectors for the choke and idle solenoid.
4. Accelerator linkage.
5. Carburetor attaching nuts.
6. Carburetor.
7. Insulator gaskets and heat shield.
Clean
• All traces of the old gasket from the carburetor flange
and intake manifold.
I * * ] Install or Connect (Figure 11)
1. Heat shield and insulator gaskets to the intake mani­
fold.
CAUTION: To avoid personal injury, extinguish
all open flames while filling and testing carbure­
tor with gasoline.
2. Carburetor.
• It is good shop practice to fill the carburetor float
bowl before installing the carburetor. This