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Throttle Position Sensor: Adjustments

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






NOTE: Do not remove plug sealing Throttle Position Sensor (TPS) adjuster screw or adjust TPS unless carburetor is overhauled or "Computer Command Control" system diagnosis indicates a problem with the sensor.

PROCEDURE
1. Drill a 0.078 (5/64) inch hole, 1/16-1/8 inch deep in plug covering TPS adjuster screw.
2. Thread a No. 8 sheet metal screw into hole and pry out plug using a suitable lever or use a small slide hammer to remove plug.
3. Disconnect TPS connector and jumper all three terminals, then connect a digital voltmeter between TPS center terminal (B) and bottom terminal (C).

NOTE: 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.

4. With ignition on, engine stopped and A/C off, turn TPS adjuster screw to obtain 0.26 volts at curb idle position.
5. Turn ignition off and install new plug over TPS adjusting screw or seal opening with RTV sealer.

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