Throttle Body Replacement Help
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Killingworth Connecticut
Throttle Body Replacement Help
So my 87 corvette's throttle body seems to be sticking and I have been looking around at replacements and have decided I want to go with a BBK 58mm TB
I've never upgraded a throttle body before so is it just a bolt on and drive operation or are there additional things I need to change for it to work correctly
I've never upgraded a throttle body before so is it just a bolt on and drive operation or are there additional things I need to change for it to work correctly
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
Whoa up there.... (forgive me I'm from Texas)
Before you go out and spend you money on a new Throttle Body, have you tried to clean it? A lot of TB problems (Sticking, idle issue, acceleration) can be traced to a dirty TB.
Take your TB off and clean it or at a minimum try to do a "on car" cleaning.
Before you go out and spend you money on a new Throttle Body, have you tried to clean it? A lot of TB problems (Sticking, idle issue, acceleration) can be traced to a dirty TB.
Take your TB off and clean it or at a minimum try to do a "on car" cleaning.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
Whoa up there.... (forgive me I'm from Texas)
Before you go out and spend you money on a new Throttle Body, have you tried to clean it? A lot of TB problems (Sticking, idle issue, acceleration) can be traced to a dirty TB.
Take your TB off and clean it or at a minimum try to do a "on car" cleaning.
Before you go out and spend you money on a new Throttle Body, have you tried to clean it? A lot of TB problems (Sticking, idle issue, acceleration) can be traced to a dirty TB.
Take your TB off and clean it or at a minimum try to do a "on car" cleaning.
Burning Brakes
Joined: Mar 2003
Posts: 1,174
Likes: 6
From: NW MN
I put a BBK on mine too when I had TB issues. Never performed or ran as well as the stock unit. See link for what I did. It is working great and working so muvh better than the BBK ever did.
https://www.corvetteforum.com/forums...ft-rebush.html
https://www.corvetteforum.com/forums...ft-rebush.html
Team Owner
Joined: Jul 2004
Posts: 28,466
Likes: 3,288
From: Hartford WI
So my 87 corvette's throttle body seems to be sticking and I have been looking around at replacements and have decided I want to go with a BBK 58mm TB
I've never upgraded a throttle body before so is it just a bolt on and drive operation or are there additional things I need to change for it to work correctly
I've never upgraded a throttle body before so is it just a bolt on and drive operation or are there additional things I need to change for it to work correctly
Yes, it is bolt on. You have to take the top plate off, take the IAC off, take the coolant hoses off and take the IAC housing off. New gaskets obviously. That said, since you are there, why not clean the IAC passages, clean the TB butterflies and clean the IAC housing? Spray off the IAC pintle with brake cleaner and GENTLY wipe it (no pushing) and see if it works better. For all you know, you might have a bad cable.
Advanced
Joined: Apr 2017
Posts: 55
Likes: 8
So, you'd build up enough force to get past the sticking point, and then, too much force, and you're instantly at 50% or more throttle. It made driving it in a civilized manner, difficult.
A thorough cleaning, pretty much exactly as aklim describes there solved the issue. The throttle's been nearly perfect for the last three or four months now.
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Instructor
Joined: Aug 2007
Posts: 101
Likes: 0
From: Coos Bay Oregon
ONE MORE THING : Going to a 58mm isn't the answer at all in my experience. The Stock unit is a good fit for a stock system. The 52mm will work fine but don't even consider the 58 unless you do some porting and a host of other MATCHED air flow re-mods. Clean the stock unit my friend & you'll be a happy and richer Vetter !!