Auxiliary Air Valve (Idle Speed): Testing and Inspection

CHECKING AUXILIARY AIR REGULATOR





COLD ENGINE
- Coolant temperature below 30°C (80°F)
- Remove wiring connector from auxiliary air regulator
- Start engine and run at idle speed
- Pinch either hose connected to auxiliary air regulator
Idle speed should decrease slightly

WARM ENGINE
- Wiring connector for auxiliary air regulator connected
- Start engine and run until it reaches operating temperature
- Pinch either hose connected to auxiliary air regulator
Idle speed should not change





VOLTAGE SUPPLY (ENGINE COLD/WARM)
- Remove wiring connector from auxiliary air regulator
- Bridge terminals with test light
Test light should glow with engine idling
If test light does not glow with engine idling, see wiring diagram in repair manual