4 Runner 2WD L4-144.4 2366cc 2.4L SOHC (22R-E) (1990)
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.