Air Control Valve
- After ensuring air pump and all hoses are okay, check carburetor and air control valve attaching nuts for tightness. Disconnect vacuum sensing tube from relief solenoid valve. See Fig 1. Disconnect air control valve hose at air cleaner.
- Start and run engine at idle. Place finger over open end of hose from air control valve. Connect detached end of vacuum sensing tube back onto relief solenoid valve.
- Slowly increase engine speed and check that air starts to flow from air control valve hose when engine speed is about 1300 RPM. Stop engine and remove pipe from air control valve to thermal reactor.
- Start and run engine at idle. Check that air does not flow from air control valve (where pipe has been disconnected). Increase engine speed. Air should flow from valve at about 4500 RPM. If valve does not function as described, replace it.
Courtesy of MAZDA MOTORS CORP.