Bypass Air Control (BAC) Valve
WARNING: This page is about a different car, the 1995 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Remove BAC valve from throttle body. Let valve cool. Place air valve in water at temperature greater than 176°F (80°C) or heat with heat gun. Plunger should move outward. See Fig 1 .