Toyota 4-Runner 1985 Repair Manual page 254

FUEL SYSTEM - Carburetor
FU-11
FU0275
FU0276
FU0278
FU0277
5. INSPECT OUTER VENT CONTROL VALVE
(a) Check the valve and valve seats for damage.
(b) Check that the valve rod moves smoothly.
(c) Connect the terminal to the battery terminal.
(d) You should feel a click from the control valve when
battery power is connected and disconnected.
If the control valve is not operating properly, replace it.
6. INSPECT CHOKE BREAKER DIAPHRAGM
(a) Apply vacuum to the diaphragm.
(b) Check that the vacuum does not drop immediately.
(c) Check that the choke valve opens slightly when
vacuum is applied.
7. INSPECT CHOKE HEATER
Using an ohmmeter, measure the resistance, between the
terminal and heater housing.
Resistance: 20 - 220 at 20°C (68°F)
8. INSPECT CHOKE OPENER DIAPHRAGM
(a) Apply vacuum to the diaphragm.
(b) Check that the vacuum does not drop immediately.
(c) Check that the link moves when vacuum is applied.