C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

TB Installed TPS voltage question

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Old Mar 2, 2006 | 12:22 PM
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Default TB Installed TPS voltage question

I recently replaced my TB with a bbk 52mm that came off another car. I took everything off and reinstalled everything exactly the same as it came off. However, do I need to adjust the TPS voltage, and if so, how do I? The car seems to idle a bit funny, same RPM just a little rough thats all.
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Old Mar 2, 2006 | 12:48 PM
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Originally Posted by 96Eric
I recently replaced my TB with a bbk 52mm that came off another car. I took everything off and reinstalled everything exactly the same as it came off. However, do I need to adjust the TPS voltage, and if so, how do I? The car seems to idle a bit funny, same RPM just a little rough thats all.

What year of car? some of the earlier ones where adjustable. the later ones where not adjustable. The way to tell is looking at the TPS and see if the screw holes are slotted.
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Old Mar 2, 2006 | 02:04 PM
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Originally Posted by 96Eric
However, do I need to adjust the TPS voltage, and if so, how do I?
No. The TPS on the 1990 and later C4s is non-adjustable. The ECM (or PCM or whatever in your later car) takes the low reading from the TPS and uses that voltage as closed throttle. Even if you could adjust the TPS, it would take whatever you adjusted it to and treat it just as it is adjusted now. It may pay to follow your FSM for your minimum air adjustment if the '96 has one.

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