Disassembly (Throttle Body Cover - Model 220)

1. Place throttle body on Holding Fixture (J-9789-118 or BT 30-15) to prevent damage to throttle valve. Remove cover-to-throttle body screws, noting location of 2 short screws.
2. Remove throttle body cover. See Fig 1. Throttle body cover and pressure regulator are serviced as an assembly. DO NOT  remove pressure regulator-to-cover screws. Remove TPS and IAC assembly. Throttle valve screws are staked in position and should not be removed.

Fig 1: Exploded View of Throttle Body Assembly (Model 220)

Courtesy of GENERAL MOTORS CORP.