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Home >> Mazda >> 1989 >> 323 GTX >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (System/Component Tests) >> Fuel System >> By-Pass Air Control (BAC) System >> BAC Check

BAC Check

WARNING: This page is about a different car, the 1989 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect a jumper wire to ground at single-pin Green connector near battery. Install tachometer. Operate engine to normal operating temperature. Allow engine to idle.
  2. Disconnect BAC valve connector. See Fig 1 . Note engine RPM. Engine speed should decrease with connector removed. Reinstall connector.
Fig 1: Disconnecting BAC Valve Connector
G117784Courtesy of MAZDA MOTORS CORP.
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