1990 Mazda RX-7 Base, StandardFACTORY OEM SERVICE PROCEDURE

Air Control Valve

  1. Operate engine to normal operating temperature. Stop engine and install tachometer. On turbo models equipped with Anti-Lock Brake Systems (ABS), disconnect and plug air hose and vacuum hose of air by-pass valve from turbo.
    CAUTION: On turbo models with Anti-Lock Brake Systems (ABS), ensure air hose and vacuum hose of air by-pass valve are disconnected and plugged prior to removing air silencer-to-air control valve hoses.
  2. On all models, disconnect air silencer-to-air control valve hose at air control valve. Place finger over air control valve outlet. Start engine and increase engine speed to 3750 RPM on turbo models or 1500-2500 RPM on non-turbo models. Note that air begins to flow at specified RPM.
  3. Operate engine at idle. On turbo models, disconnect relief valve solenoid Blue connector. See Fig 1 . On non-turbo models, disconnect relief valve solenoid-to-air control valve hose. See Fig 1 .
  4. Check that air flows from air control valve outlet at speeds greater than 1200 RPM on turbo models or at idle on non-turbo models. Reconnect vacuum hose or Blue connector.
  5. Remove intake manifold-to-check valve hose. Disconnect hose at check valve on turbo models or intake manifold on non-turbo models. Place finger over opening.
  6. On turbo models, disconnect hose at air control valve. See Fig 2 . On non-turbo models, disconnect hose at switching solenoid valve. See Fig 2 .
  7. With engine at idle, ensure air flows from intake manifold fitting (non-turbo) or check valve (turbo). Replace air control valve if necessary. Reconnect all hoses.
Fig 1: Disconnecting Relief Valve or Switching Solenoid Valve
G90A04381Courtesy of MAZDA MOTORS CORP.
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