1994 LT-1 Vette TPS adjustment help needed
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 1,108
Likes: 4
From: Plano Texas
1994 LT-1 Vette TPS adjustment help needed
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!!!
Mark.......Merry Christmas and Happy Holidays!!!
Le Mans Master
Joined: Mar 2001
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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St. Jude Donor '12
Burning Brakes
Joined: Mar 2005
Posts: 1,083
Likes: 116
From: Richmond Hill Ontario
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
http://www.golenengineservice.com/do.../Adj%20TPS.pdf
Last edited by FrankieD; Feb 6, 2013 at 12:52 AM.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
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/ls-tech-articles/
http://www.golenengineservice.com/ls-tech-articles/
Melting Slicks
Joined: Feb 2009
Posts: 2,072
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From: Oklahoma City OK
St. Jude '10
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Le Mans Master
Joined: Jan 2006
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From: Orlando FL
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).
Burning Brakes
Joined: Mar 2005
Posts: 1,083
Likes: 116
From: Richmond Hill Ontario
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.
Melting Slicks
Joined: Feb 2009
Posts: 2,072
Likes: 1
From: Oklahoma City OK
St. Jude '10
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.
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.
