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• 20:31, 6 July 2026 Cliff talk contribs created page Idle air control valve (Created page with "'''Idle air control valve''' refers to the idle-control valve used by the Pontiac Fiero ECM. The idle air control valve is often abbreviated as IAC. It allows the ECM to control idle speed by adjusting the amount of air that bypasses the throttle plate. == Overview == The IAC valve is part of the throttle-body and idle-control system. When the throttle is closed, the engine still needs air to idle. The ECM controls this bypass air through the IAC valve. By mo...")