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Home >> Oldsmobile >> 1985 >> Calais Base, 2.5 U, Standard >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> CCC Component Removal & Installation >> Removal & Installation >> Throttle Position Sensor (TPS) R&I - CARBURETED Models >> Adjustment

Throttle Position Sensor (TPS) R&I - CARBURETED Models: Adjustment

  1. If voltage reading in step 8) of installation procedure is incorrect, TPS must be adjusted.
  2. Remove tamper-resistant plug covering adjustment screw. Using a 5/64" drill, drill a 1/16" to 1/8" deep hole in plug. Use care in drilling to prevent damage to adjustment screw head.
  3. Start a No. 8, 1/2" long self-tapping screw in drilled hole turning screw in only enough to ensure good thread engagement in hole.
  4. Placing a wide-blade screwdriver between screw head and air horn casting, pry against screw head to remove plug. Discard plug. Remove TPS adjustment screw with TPS adjustment tool (J-28696).
  5. Disconnect TPS connector and jumper all three terminals. Connect digital voltmeter from TPS connector center terminal "B" to bottom terminal "C". Reinstall TPS adjustment screw. With ignition on (engine off), quickly adjust screw to obtain correct TPS voltage.
  6. After adjustment, install new tamper-resistant plug (supplied in service kits) in air horn. Drive plug into place until flush with raised pump lever boss on casting. Clear trouble code memory after adjustment.
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