LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 1998 >> 626 ES, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> By-Pass Air Control (BAC) Valve >> Millenia
April 5, 2026: LEMON Manuals is launched! Read the announcement.

By-Pass Air Control (BAC) Valve: Millenia

  1. On Millenia 2.3L, BAC valve is located on rear of front cylinder head. See Figure . On Millenia 2.5L, BAC valve is located underneath throttle body. See Figure .
  2. On all models, ensure engine is cold. Start engine and let it idle. Idle speed should gradually decrease as engine reaches normal operating temperature. If idle speed does not decrease, check coolant hose to BAC valve. Repair as necessary. If coolant hose is okay, replace BAC valve.
scientia non olet · About LEMON Manuals