Coves4me

I have many threads on this in the past, but I wanted to hear from someone on setting the TPS on my 1994 Base LT-1 engine. I had to remove the intake manifold to chase an oil leak and decided to clean out the throttle body good while I have everything apart. I removed the TPS and the IAC from the throttle body to give the body a good cleaning. Anyway, I received my new AC Delco TPS today from Rock Auto and need to install it. I've read on the forum that the TPS is self-adjusting and self-learning, that it should be set at 0.54 volts with a digital multimeter and that I needed a Tech 1 so that the PCM could learn the TPS. I do not have a Tech 1 and the holes in the old and the new TPS do allow for adjustment. Soooooooo, what is the proper installation method? Thanks in advance for any help.

Mark.......Merry Christmas and Happy Holidays!!!

96GS#007

'90 and up are not adjustable. Install the TPS and go.

jaa1992

had to replace one on my 92 and thats all I had to do.

FrankieD

Read the following article on "How to adjust LT1 Throttle Position Sensor" it helped me out immensely to correct my idle problem I had. I used a small round file to modify the slots on the TPS so I could get the proper position to mount it.
http://www.golenengineservice.com/do.../Adj%20TPS.pdf

96GS#007

Snake oil. How the TPS signal is viewed by the PCM is part of the coding. It doesn't care what the voltage is so long as the signal is below 1.0v. You can watch this on any scanner....less than 1.0v will show 0% throttle opening.

C4fan

Mine is .64 at 0% throttle.

FrankieD

That's about where it should be according to the article above.

C4fan

Mine is a 93 speed density and should be .50 according to the article.

pcolt94

My 94 is the same.

You don't need a Tech1 to read the voltage if your interested in what it is. You can just measure it with a DVM by connecting to the wiper of the TPS. Its pin C, DK blue wire. Just tap into the wire with something sharp like a sharp probe (or pin).

FrankieD

You are correct, I apologize, I assumed you had a '94. I used this method to help get my idle under control. I also modified my Holley TB by drilling a hole in the IAC passage in order to get my IAC down to where it could now have some control again. I keep adjusting down the idle set screw and then going back to re-adjust the TPS voltage several times until I'm now idling steady at about 900rpm.

C4fan

I've had similar issues even though my idle has been fairly normal. I had messed with my idle screw and my IAC was 0.