Location of idle air control valve on 1991 Buick Regal?

The Idle Air Control (IAC) valve on a 1991 Buick Regal is located on the throttle body. It's a small, usually rectangular or cylindrical, electrically controlled valve that sits near the throttle plate itself. Because the exact location can vary slightly depending on the engine (3.1L V6 or 3.8L V6 were common), you'll need to visually inspect the throttle body. Look for a small valve with an electrical connector attached. It's typically on the side or top of the throttle body.

To find it easily:

1. Locate the throttle body: This is the large housing connected to the intake manifold where the throttle cable is attached.

2. Inspect the throttle body carefully: Look for the small valve with the electrical connector. It might have a label, though this is not guaranteed on older vehicles.

3. Consult a repair manual: A repair manual specific to your 1991 Buick Regal with the correct engine size will give you a precise diagram showing the location of the IAC valve.

Remember to disconnect the negative battery terminal before working on any electrical components.