Throttle Position Sensor
#1
Throttle Position Sensor
I have an 87 GT. With the TPS connected the car runs like junk. It stumbles on acceleration. I have replaced it twice. If I unplug it the car runs like a scalded dog. I've tried all the adjusting voltages tips and nothing works. Any ideas?
#3
RE: Throttle Position Sensor
Yes, it is the same with new TPS and old. I even brought home several from the junkyard and all did the same. 5.0's are a dime a dozen in the junkyard here. I don't understand why it runs so great with it unplugged.
#7
RE: Throttle Position Sensor
Take a voltage meter and watch the voltage at the TPS as you cycle the throttle from idle to full throttle. You should see a steady increase in voltage up to about 4.6 volts. A dead spot would be an area where the voltage went to zero or you saw something out of whack. On a digital voltage meter, just know that the reading may go from hundreds to thousands and may look like a odd spot as it changes the readings.
#8
RE: Throttle Position Sensor
Thanks guys. Even after buying the 3rd new TPS and adjusting the voltage it still stumbles on acceleration with the TPS connected. If I unplug it, it runs great. Is it possible that the connector itself is bad? Any way to test these things. I guess I could get another out of the junk yard and solder it in and try it.