Removal (Front Valve)
WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Turn OFF the ignition. Disconnect the AIR crossover pipe from the shut-off valve. See Figure. Disconnect the vacuum line from the shut-off valve. See Fig 1. Remove the AIR shut-off valve nut. Remove the shut-off valve to manifold pipe fasteners. Remove the shut-off valve from the bracket.
Courtesy of GENERAL MOTORS CORP.