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Throttle Body

  1. Disassembly of throttle body unit for immersion in cleaning solvent requires removal of TPS (rear unit) and IAC assemblies. Throttle valve screws are staked in position and should not be removed. If necessary to remove TPS, continue as follows:
    NOTE: TPS assembly is preset at the factory and retaining screw is spot-welded in position.
  2. Using a 1/4" drill, drill completely through TPS screw access hole in base of rear throttle body unit to remove spot weld. See Fig 1 .
  3. Remove and discard TPS attaching screws. Remove lock washers, retainers and TPS from throttle body. If necessary, remove TPS actuator lever-to-throttle shaft screw. Remove IAC assembly and gasket from each throttle body with a 1 1/4" wrench.
    Fig 1: Removing TPS Assembly (Rear Unit Only)
    G09315804Courtesy of GENERAL MOTORS COMPANY
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