Throttle Position Sensor (TPS) Adjustment

Fig. 16 Throttle Position Sensor (TPS) adjustment screw plug removal:

Fig. 18 Throttle Position Sensor (TPS) adjustment specifications:

Do not remove plug sealing TPS adjustment or adjust TPS unless carburetor is overhauled or ``Computer Command Control'' system diagnosis indicates a problem with the switch.
1. Drill a .078 (5/64) inch hole, 1/16-1/8 inch deep in plug covering TPS adjustment, Fig. 16.
2. Thread a No. 8 sheet metal screw into hole and pry out plug using a suitable lever.
3. Remove TPS adjusting screw using tool J-28696 or equivalent.
4. Leaving electrical connector in place, connect a digital voltmeter between TPS center terminal (B) and bottom terminal (C), using jumper wires if necessary. Only a digital voltmeter with 10 megohm input impedance or higher can be used. Conventional voltmeters do not have sufficient resistance to obtain accurate readings.
5. With ignition on, engine stopped and A/C off, install TPS screw and adjust quickly to obtain specified TPS idle voltage, Fig. 18.
6. Turn ignition off and install new plug over TPS adjusting screw or seal opening with RTV sealer.