Chevrolet Repair: 1990 chevy silverado 1500 350v8, torx screws, chevy silverado

Question
how to put on a new throttle positioning sensor. Was told it has to go on a certain way.

Answer
Hey Erik,

 The TPS is mounted to the passengers side of the throttle body and is secured with torx screws.  Some models have a small adjustment but for the majority of them are just bolt on.  If you have a volt meter check the voltage reference out to the ECM for adjustment.  There will be three wires on it and with key on engine off you will have 5 volts on one wire, 0 volts (ground) on another and the middle wire will be somewhere between 0 and 5 volts.  The idea is to get that adjustment to approximately .9v if memory serves me correctly.  I have seen them anywhere from .4 to 1.1 and no anomalies have happened.  All electrical repairs should be done with the battery disconnected.


Wayne