Auxiliary Air Regulator
NOTE:
Test must be performed on cold engine only.
- Remove electrical connector from auxiliary air regulator. Start engine and run at idle. Pinch either hose at auxiliary air regulator. Idle speed should drop slightly.
- Reconnect plug at auxiliary air regulator and warm up engine. Pinch either hose at regulator; idle speed should not change.
- If idle speed decreases when hose is pinched, disconnect electrical connector and connect a test lamp across terminals. If test lamp is lit with engine running, auxiliary air regulator must be replaced.
- If voltage is reaching regulator plug, check resistance across regulator terminals. Resistance should measure 16-22 ohms on all models. If resistance varies, replace control pressure regulator.