Subaru 1600 Service Manual page 163

FUEL SYSTEM
2. Carter-Weber Carburetor
Trouble
I. Flooding
2. Excessive fuel
consumption
3. Rough idle
Possible cause
a. Poor contact between needle valve and
seat, or damaged surface.
b. Improper float level adjustment.
c. Worn float hinge or damaged float.
d. Worn float hinge pin.
e. High fuel pressure.
a. Flooding.
b. Dirty air bleeds.
c. Connecting rod not installed properly.
d. Accelerating pump nozzle feeding.
e. Choke valve not opening fully.
f. Feedback pulse solenoid not functioning.
g. Bowl vent solenoid not functioning.
a. Improper idle adjustment.
b. Dirt in low speed jet or in bleeds or
passages.
c. Flange to body gasket defective.
d. Flange to manifold bolts loose or dam-
aged O-ring.
e. Leaking vacuum hoses.
f. Intake manifold to head bolts.
g. Damaged E.G.R. valve.
Corrective action
Clean or replace needle valve and seat
assembly.
Readjust float level.
Replace float.
Replace hinge pin.
Make sure fuel return line is open and that
restriction is not clogged, inspect and repair
or replace fuel pump.
See section" I Flooding".
Clean.
Make sure connecting rod is attached at
both ends and that bushings are in good
shape.
Check discharge ball and weight.
Make sure anti-Siphon passage in body and
air horn are open.
Check to make sure choke valve does not
bind.
Check to make sure choke coil assembly
has electric supplied.
Check to make sure choke coil assembly
does not have an open circuit - if so
replace.
Make sure wire connections are clean and
tight.
Make sure electronic control module is
operating correctly, check feedback pulse
solenoid for continuity and for shorts or
grounded wires - replace if damaged.
Check solenoid for continuity and for
shorts or grounds.
Check to make sure that power supply to
bowl vent solenoid is good.
Adjust idle.
Clean carburetor.
Re-tighten screws or replace gasket.
Re-tighten bolts or replace gasket.
Inspect and replace.
Re-tighten bolts or replace gasket.
Make sure E.G.R. valve closes fully with no
vacuum applied.