Chevrolet Full Size Cars 1979-1989

Throttle Position Sensor (TPS)


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Fig. Fig. 1 Throttle Position Sensor (TPS)

On feedback vehicles, the throttle position sensor is mounted in the carburetor body and is used to supply throttle position information to the ECM. The ECM memory stores an average of operation conditions with the ideal air/fuel ratios for each of those conditions. When the ECM receives a signal that indicates throttle position change, it immediately shifts to the last remembered set of operating conditions that resulted in an ideal air/fuel ratio control. The memory is continually being updated during normal operations.

For information regarding the throttle position sensor service on fuel injected engines, please refer to of this guide.