1990 TPS

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May 23, 2004 | 06:11 PM

mfemma

Thread Starter

Heel & Toe

Joined: Apr 2002

Posts: 18

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From: Greenville SC

1990 TPS

Is a Throttle Position Sensor on a 1990 Corvette adjustable. I know mine is way out of wack, coming in at .72 volts. But, if you lossen the screws, you really don't have much room to rotate the TPS. I can't get it any lower. I have seen TPS's where the hole that the screws go into are a lot larger and the hole opening is "Arch" shaped to allow you to rotate it a bit. The holes on mine are just round holes.

May 23, 2004 | 06:32 PM

corvette1990

Burning Brakes

Joined: Nov 2000

Posts: 1,012

Likes: 1

From: Bowie MD

Re: 1990 TPS (mfemma)

you do not have an adjustable TPS. The most you can do is bend the tang a little. Another thing you can do is disconnect the battery, and it will zero the computer. Then your TPS may be a different voltage intially, till the computer re-learns the positions of your throttle. Our MAP cars are just a little different that all the rest of those MAF or OPTI cars....

May 23, 2004 | 06:50 PM

1985 Corvette

Le Mans Master

Joined: May 2004

Posts: 5,386

Likes: 534

Re: 1990 TPS (corvette1990)

Quote:

Ah, well I'm glad you posted first. Seeing as how you actually have a 90 as well. I was just about tell him some info about MAF based TPIs, I forgot 90-91 vettes had MAP like you stated. I almost made myself look like a rookie. :lol:

[Modified by 1985 Corvette, 11:51 PM 5/23/2004]

May 23, 2004 | 10:35 PM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

Re: 1990 TPS (mfemma)

:iagree:
Your IAC needs to be set for correct base idle but your TPS is not adjustable; the ECM will "learn" the min setting as well as WOT setting.

May 24, 2004 | 07:55 AM

mfemma

Thread Starter

Heel & Toe

Joined: Apr 2002

Posts: 18

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From: Greenville SC

Re: 1990 TPS (65Z01)

Thanks for the info everyone.

May 24, 2004 | 08:21 AM

mfemma

Thread Starter

Heel & Toe

Joined: Apr 2002

Posts: 18

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From: Greenville SC

Re: 1990 TPS (mfemma)

One last comment on this. I am having problems with the Idle. When in park, you can feel the idle surging a little, not much but it is not smooth. When in drive and you come to a stop, the idle is really low and sometimes stalls. Which route do I go. I know my TPS is putting out incorrect voltage. Thanks for any help

May 24, 2004 | 10:32 AM

XtremeVette

Original Founding Member!

Joined: Jul 1999

Posts: 9,037

Likes: 88

From: Granby, MA

Cruise-In 1, 3, 9. 10 & 11 Veteran

Re: 1990 TPS (mfemma)

I too have a 1990 car....and not sure...but want to get the most out of my TPS...and seeing under 65Z01 website about adjusting your TPS (you can peek it a little)....I researched it further.....For a while was bummed cause other people had adjustable sensors...but not us poor 90 and 91 users.....well guess what....CORVETTE CENTRAL....sells an adjustable one now....for 90 and 91 cars....comes with clips, alligator clamps, everything.....$50 brand new...in their catalog....considering the original is either close to this or the same price....might as well go with the adjustable one....Check it out....its in their new catalog or go online at http://www.corvettecentral.com

part number is: 304574 (85-91) and 304614 for (92-96) cars

PS...THEY ALSO JUST STARTED MAKING RPM TACH FILTERS!
393125 84-89 AND 304010 92-93 cars

[Modified by XtremeVette, 10:36 AM 5/24/2004]

[Modified by XtremeVette, 10:40 AM 5/24/2004]