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Setting early TPS voltage

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
When you go to set the TPS voltage i am told to loosen the 2 torx bolts then rotate the TPS to adjust the voltage. How exactly do you rotate it? Mine doesnt really turn at all. Am i missing somthing?
 
well the thing thats supposed to turn, is it the sensor it self where the plug goes into?
 
The Throttle Position Sensor is activated by a tab, which is located on the side of the throttle body, on the blade's shaft. By loosening the screws you can move the TPS back and forth (front to rear). The position of the TPS (0.53 mV or so at closed position (idle) to about 5 mV at wide open throttle (WOT).
 
I set mine as high as I could, but kept the idle somewhat to normal. I think mine tends to idle at around 650-700. Rotating it counter clock wise will give you more voltage, and rotating it down less. Stock setting is .5 Volts with just the key on, and 5 volts at wide open throttle with the key on as well. I could not get mine to 5 volts at WOT, I think mine ended up being about 4.7 or so, with the low end being .68. Hope this helps, mine moved freely when I adjusted it. When I checked it I used paper clips to shove into the top two wires I believe, then just pulled them out when I was done. Good luck.
 
You're correct sir; I guess I was thinking O2 sensor. :o
geekinavette said:
Ken....I think you meant V (Volts), not mV (milli-Volts). ;)

Bill
 
thans guys i understand how to do it now! Everyone is always great help!
 
jimmers said:
When you go to set the TPS voltage i am told to loosen the 2 torx bolts then rotate the TPS to adjust the voltage. How exactly do you rotate it? Mine doesnt really turn at all. Am i missing somthing?
What exactly does this accomplish?

Peter
 
It sends a signal to the ECM indicating the position of the throttle body blades (accelerator pedal ;)). The computer uses the information to taylor the engine's needs for both performance as well as clean air emissions.
 

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