mine does it too, but mines a BBK. Im just going to upgrade, as soon as i have the chance.

 

So stock tb on an lt1 is 52mm? I always seem to forget the simple numbers haha

There has never been any sort of coating on the TB to prevent this from happening. Of course, nothing on this vehicle was maintained before I picked it up.

 

the new tb has a coating on the inside. stock tb is 48mm.

 

i think my bbk has a rough surface on the inside and may not have a coating.

 

Alright, well Ill go out and try to adjust the screw and monitor the tps volts. If I can find open up the blades a little more and keep the tps volts within that certain range I should be able to find the sweet spot. I can't recall the exact numbers, but I think it is anywhere between .3-.75 volts for the TPS?

 

Ya I use in my car Caprice TB and works fine.

 

Found the values. Stock closed throttle voltage for the TPS can range anywhere between .2-.9 volts and the pcm will baseline that as your 0% throttle position and base adjustments from there.

 

Alright, well I messed it for quite awhile. Regardless of the TPS position/voltage the computer constantly picks up that the throttle position is changing. As in if I give it any throttle, it will not return to 0 and stick anywhere from 1-4%throttle. I even adjusted it out far enough yet still within tps volt specs to where the blades would not catch and it would still not return all the way. Maybe the return mechanism, the lever on the driver side containing the spring and arm, is wore out and unable to bring it back fully? Anyway, guess my only option is to find a new one eventually.

 

you can take a drill and make the holes on the tps long so the sensor can be adjusted. lets see if i can remember the proper way to set your tb idle setting first need to put the computer into diognostic mode, for mine its simply scann for codes. once in diognostic mode you unplug the iac it should be closed all the way. start the car and set the idle to 450-500rpms. set your tps to .5 turn car off plug the iac in and start it up. should take a short drive to alow the computer to get used to the settings.

 

I contacted Holley. They told me they don't put any sort of finish or coating on their throttle bodies to keep the blades form sticking or catching. They said, after reading what I told them I have checked, that possibly a screw on the blades is lose causing the blade to move or the bushings are worn out. What bushing would they be talking about? Are they replaceable or would getting a new TB be better?