Replacement TB for L98

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Apr 25, 2024 | 08:01 AM

solar88

Thread Starter

Racer

Joined: Oct 2023

Posts: 383

Likes: 123

From: St. Petersburg, FL

Replacement TB for L98

My stock 88 L98 TB tends to stick a bit at idle, it will idle around 1200 and if you blip the throttle it will come down to 800. I can replicate the issue with the hood up and if I push the throttle butterfly by hand it will come back down too. Is there any decent replacements or rebuilt ones out there or is this something that just needs to be taken apart and lubed ?

Apr 25, 2024 | 09:11 AM

ThomasR

Melting Slicks

Joined: Apr 2019

Posts: 2,466

Likes: 700

From: Clark, NJ

I would get the gasket set and some throttle body cleaner. I would replace the IAC and make sure you're comfortable with re setting the IAC and setting the TPS voltage.

Apr 25, 2024 | 01:29 PM

solar88

Thread Starter

Racer

Joined: Oct 2023

Posts: 383

Likes: 123

From: St. Petersburg, FL

Quote:

Originally Posted by ThomasR

I would get the gasket set and some throttle body cleaner. I would replace the IAC and make sure you're comfortable with re setting the IAC and setting the TPS voltage.

I actually did all that and replaced the IAC and TPS. Do you know if there is a rebuild kit or can I just tear it down and clean and lube it ?

EDIT: do you mean get the 4 piece gasket set and just tear it down, clean it and lube it ? I’m thinking there has to be some bushings that are worn and causing the issue ?

Last edited by solar88; Apr 25, 2024 at 05:12 PM.

Apr 25, 2024 | 03:50 PM

Rod Schneider

Instructor

Joined: Dec 2012

Posts: 105

Likes: 15

From: Ball Ground Georgia

It may be the accelerator cable hanging up a bit, unhook if from the throttle body and see if lever on the throttle body returns to the stop.

Apr 25, 2024 | 04:47 PM

solar88

Thread Starter

Racer

Joined: Oct 2023

Posts: 383

Likes: 123

From: St. Petersburg, FL

Quote:

Originally Posted by Rod Schneider

It may be the accelerator cable hanging up a bit, unhook if from the throttle body and see if lever on the throttle body returns to the stop.

I checked both the accelerator and cruise control cables and they’re okay. I can feel just the slightest resistance on the throttle lever when I push it just a tiny bit back to the idle stop. I’ve removed the TB and cleaned it really well, but wasn’t sure if I should or could use some spray lube on the throttle shaft ?

Apr 26, 2024 | 08:00 AM

PAINTER MAN

Burning Brakes

Joined: May 2004

Posts: 1,230

Likes: 27

From: Athens Ohio

Check the worn bushings in the butterfly shaft. It’s the most common problem on old throttle bodies.

Apr 26, 2024 | 09:54 AM

solar88

Thread Starter

Racer

Joined: Oct 2023

Posts: 383

Likes: 123

From: St. Petersburg, FL

Quote:

Originally Posted by PAINTER MAN

Check the worn bushings in the butterfly shaft. It’s the most common problem on old throttle bodies.

I have been thinking the bushings are probably worn, but are replacement bushings available ?

Apr 26, 2024 | 01:12 PM

PAINTER MAN

Burning Brakes

Joined: May 2004

Posts: 1,230

Likes: 27

From: Athens Ohio

I replaced my throttle body when the bushings went bad. You used to be able to get them rebuilt, but I haven’t heard of anyone doing that for sometime.