Toyota 4-Runner 1985 Repair Manual page 270

Fuel Level
Idle Mixture Adjusting Screw
FUEL SYSTEM -
Carburetor
FU-27
7. ADJUST IDLE SPEED AND IDLE MIXURE
(a)
Initial conditions:
• Air cleaner installed
• Normal operating coolant temperature
• Choke fully open
• All accessories switched off
• All vacuum lines connected
• Ignition timing set correctly
• Transmission in N range
• Fuel level should be about even with the correct
level in the sight glass.
• EBCV off (for Calif.)
(b) Start the engine.
(c) Set to the maximum speed by turning the IDLE MIX-
TURE ADJUSTING SCREW.
(d) Set to the idle mixture speed by turning the IDLE
SPEED ADJUSTING SCREW.
Idle mixture speed:
740 rpm (MIT)
790 rpm (A/T)
(e)
Before moving to the next step,continue adjustments
(c) and (d) until the maximum speed will not rise any
further no matter how much the IDLE MIXTURE AD-
JUSTING SCREW is adjusted.
(f) Set to the idle speed by screwing in the IDLE MIX-
TURE ADJUSTING SCREW.
Idle speed:
700 rpm
750 rpm
(MIT)
(A/T)
NOTE: This is the Lean Drop Method for setting idle speed
and mixture.
8. PLUG IDLE MIXTURE ADJUSTING SCREW
(a) Remove the air cleaner.
(b) Tap in new plug until it is even with carburetor surface.
(c) Reinstall the air cleaner.
9.
CHECK AND ADJUST FAST IDLE SPEED
(See step 6 on page FU-22)