Toyota 4-Runner 1985 Repair Manual page 127

EMISSION CONTROL SYSTEMS (CARB.) - Mixture Control
(Me)
System EC-27
Me
Valve
EC0315
INSPECTION OF MC SYSTEM
1. REMOVE AIR CLEANER COVER AND AIR FILTER
2. START ENGINE
3. CHECK MC VALVE
(a) Disconnect the vacuum hose from the MC valve.
(b) Place your fingers over the air inlet of the MC valve.
(c) Check that vacuum is not felt.
(d) Reconnect the vacuum hose and check that vacuum
is felt momentarily.
NOTE: At this time, the engine will idle rough or die, but
this is normal.
4. REINSTALL AIR FILTER AND CLEANER COVER
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~EC03~16
A03045