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Throttle Position Switch

  1. Remove air cleaner assembly. With throttle lever in closed position, loosen TPS-to-fuel injection pump attaching screws. Attach an ohmmeter across ignition (Pink) and EGR terminals or wires. See Fig 1.
  2. Using the proper size "switch-closed" gauge block, insert block between gauge boss on injection pump housing and throttle shaft wide open stop screw. Rotate and hold throttle lever against gauge block.
    Fig 1: Adjusting Throttle Position Switch. Rotate clockwise until continuity occurs.
    G09360429Courtesy of GENERAL MOTORS COMPANY
  3. Rotate TPS clockwise (facing TPS) until continuity just occurs on ohmmeter. Hold switch body in this position and tighten retaining screws. TPS must be set only while rotating switch body in clockwise rotation.
  4. Remove "switch-closed" gauge block and insert proper "switch-open" gauge block. Rotate throttle lever so it rests against "switch-open" gauge block.
  5. Ohmmeter reading should indicate no continuity. If no continuity is measured, switch is properly adjusted. If continuity is registered, repeat entire adjustment procedure.
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