TPS Sensor

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FLSY2730

New member
This is for my iroc that i just purchased, the tps should be set at 4.5 -6.0 volts , right?
Sorry about the non syty question, but they do share the same throttle body, its just not adjustable on the syty, why did GM do that to the syty throttle body anyway?
 
V6 Kompressor

V6 Kompressor

New member
Aw hell, you can adjust it... Just loosen the two torx srews and have your scantool hooked up and watch the volts.... then smack it good with a hammer...Viola... you have adjusted it... :lol: No, the computer will compensate for the voltage fluctuation and when you first turn your key on, the ecm looks at the tps output and sets that voltage as the 0 degree throttle angle. 8)
 
V6 Kompressor

V6 Kompressor

New member
According to my tech manuals, from 1989 model year up, GM vehicles have self adjusting TPS's and the nominal volts should be in the .4 to .8 volt range.... Unless there is carbon buildup in the throttle bores or if someone has adjusted the throttle blades... And that figure is at Idle. You should see aboout 5 volts, WOT (wide fucking open throttle), and no deviation when you slowly accelerate....
 
F

FLSY2730

New member
So , the nominal volts should be at .54-.60 with motor off?

If the tps is self adjusting on these cars why does it have big groves where it can be adjusted? As long as its in the .54-.64 range it is going to self adjust from there is what your saying?
 
Daron

Daron

Active member
The TPS isnt self adjusting, the ECM just auto zero's the throttle percent value when the key is turned on. So, if your TPS is dropping .7volts at startup, the ecm sets that value as 0 percent throttle. Then it raises the throttle percent up to 100 percent when the TPS reads about 3.8 volts higher than its initial reading at startup. Making sure 100 percent TPS corresponds with the butterflies being wide open is one key issue.

As long as your ECM sees less than about 1 volt from the TPS at startup it will not toss a code.
Adjusting the TPS really doesnt do a thing in our application, performance wise.
 
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