Toyota 4-Runner 1985 Repair Manual page 159

EMISSION CONTROL SYSTEMS (CARB.) - Auxiliary Systems EC-59
COLD
Choke Opener Diaphragm
EC3518
COLD
EC3519
HOT Choke Opener Diaphragm
Disconnect
EC3518
t4.---~FU0089
HOT
Fast Idle Cam
EC3520
INSPECTION OF CHOKE OPENER SYSTEM
1. CHECK BVSV WITH COLD ENGINE
(a) The coolant temperature should be below 55°C
(131°F).
(b) Disconnect the vacuum hose from the choke opener
diaphragm.
(c) Step down on the accelerator pedal and release it.
Then start the engine.
(d) Reconnect the vacuum hose and check that the choke
linkage does not move.
A03077
2. CHECK BVSV, DIAPHRAGM AND LINKAGE WITH WARM
ENGINE
(a) Warm up the engine to normal operating temperature.
(b) Disconnect the vacuum hose from the choke opener
diaphragm.
(c) Set the fast idle cam.
While holding the throttle slightly open, push the
choke valve closed, and hold it closed as you release
the throttle valve.
(d) Start the engine, but do not touch the accelerator
pedal.
(e) Reconnect the vacuum hose, and check that the choke
linkage moves, and that the fast idle cam is released
to the 4th step.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION, THE
SYSTEM IS OKAY; OTHERWISE INSPECT EACH PART