4 Runner 4WD V6-180.5 2959cc 3.0L SOHC (3VZ-E) (1989)
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Auxiliary Air Valve (Idle Speed): Testing and Inspection
COLD TEST (COOLANT TEMPERATURE BELOW 176°F (80°C)):
1. Start the engine.
2. Screw the idle speed adjusting screw all the way in.
Idle Speed Adjusting Screw
3. The engine rpm should drop below normal.
4. If a problem is found replace the Auxiliary Air Valve.
5. Reset idle speed, refer to ADJUSTMENT PROCEDURES.
WARM TEST (COOLANT TEMPERATURE ABOVE 176°F (80°C)):
1. Start the engine.
2. Screw the idle speed adjusting screw all the way in.
Idle Speed Adjusting Screw
3. The engine should stall.
4. If a problem is found replace the Auxiliary Air Valve.
5. Reset idle speed, refer to ADJUSTMENT PROCEDURES.
