TPs sensors different?

Creomod · Sep 4, 2026

I bought a new tps. Ran smoke machine & I’m getting a lot of smoke coming out of there. I noticed my older ones have a “cover” over that hole in the center & the new one I installed dossnt . You can see the throttle butterfly in the center. In theory I shouldn’t have vaccum comming out of there correct?Any thought on that?

General karthief · Sep 4, 2026

First,
. In theory I shouldn’t have vaccum comming out of there correct?Any thought
Vacuum does not 'come out' it pulls, but you knew this so to the question, no... You do not want unmetered air pulling through there, look for a TPS that does not have that hole.

rednotch · Sep 4, 2026

Hole really doesnt matter its the the shaft leaking... You can fix some with a radial shaft seals, last one. I did was a cheapy China is style throttle body though, there so I don't have any part numbers to give ya for an bbk/edelbrock one.

AeroCoupe · Sep 4, 2026

It’s not the job of the TPS to seal its job is to sense the throttle body position. Shaft seal on the TB is leaking. You can fix it but it’s a pain in the ass as these are non serviceable units and it’s the seal bearing that leaks. Here is the forum thread that I found researching this:

https://www.mr2oc.com/posts/5194678/

I’m just going to buy an Accufab and be done with it. Will hang the BBK on the wall of shame. Just a side note, the Edelbrocks are the same way.

Mustang5L5 · Sep 4, 2026

AGree. There is usually an O-ring/seal on the shaft of the TB that prevents gas from passing. Over the years that O-ring disintegrates or is lost.

Each brand uses a different method to seal so hard to just say “get this” and it will fix the issue.

Creomod · Sep 4, 2026

Mustang5L5 said:
AGree. There is usually an O-ring/seal on the shaft of the TB that prevents gas from passing. Over the years that O-ring disintegrates or is lost

Creomod · Sep 4, 2026

AeroCoupe said:
It’s not the job of the TPS to seal its job is to sense the throttle body position. Shaft seal on the TB is leaking. You can fix it but it’s a pain in the ass as these are non serviceable units and it’s the seal bearing that leaks. Here is the forum thread that I found researching this:

https://www.mr2oc.com/posts/5194678/

I’m just going to buy an Accufab and be done with it. Will hang the BBK on the wall of shame. Just a side note, the Edelbrocks are the same way.

Say bro ! Can this be my issue that I’ve been having? Car surging idel,& shutting off sometimes. What issues can this cause ?

Creomod · Sep 4, 2026

Bros I think y’all guys are right! This is my issue I’m assuming it’s considered are major vaccum leak am I right . I thought I was tripping…. It’s leaking from the bottom as well where the spring goes just like this screenshot I added. Assuming the throttle blade thing goes through the gasket & it would leak top/tps & bottom makes sense

AeroCoupe · Sep 4, 2026

Just and FYI, as far as I know the BBK and Edelbrock throttle bodies do not use an o-ring. They use a seal bearing and it’s a non-serviceable item according to the manufacturers. The link I posted shows how to put a seal in them. It’s a lot of work and these units are not all that great.

@Creomod - it could be all or part of the issue. Any unmetered air causes a MAF car issues.

Creomod · Sep 4, 2026

AeroCoupe said:
Just and FYI, as far as I know the BBK and Edelbrock throttle bodies do not use an o-ring. They use a seal bearing and it’s a non-serviceable item according to the manufacturers. The link I posted shows how to put a seal in them. It’s a lot of work and these units are not all that great.

@Creomod - it could be all or part of the issue. Any unmetered air causes a MAF car issues.

I appreciate all the information. I’ll get the accufab. So the accufab the best

AeroCoupe · Sep 4, 2026

IMO but I’m no expert. Just basing it off of what I have read and reviews.

I had a 70mm BBK with the EGR spacer on my car for years and never had a problem. I replaced it with an Accufab unit thinking it was part of a throttle hang issue. That turned out to be the throttle cable but I do think it’s a better unit. It’s not like you are going to get a performance change by swapping to it if you already have a like size brand X one. The Accufab units have a tendency to flow more than Brand X when comparing the same size.

gkomo · Sep 4, 2026

Only thing I don’t like about accufabs is I think they only come polished/chrome? Could be mistaken but I thought that’s all I saw.

Creomod · Sep 4, 2026

gkomo said:
Only thing I don’t like about accufabs is I think they only come polished/chrome? Could be mistaken but I thought that’s all I saw.

I’ve seen them in black they look bad ass

AeroCoupe · Sep 4, 2026

Polished or black.

Creomod · Sep 5, 2026

AeroCoupe said:
Polished or black.

Both are cool

Mustang5L5 · Sep 5, 2026

Only the 90mm and 105mm come in black.

Which irks me because I have the 70mm and dislike the chrome. Black would be perfect on my engine

rednotch · Sep 5, 2026

There not chrome, just polished aluminum..... The cheapy China Ford billet 75mm isn't a bad one for the price and comes in black or brushed aluminum just no spacer, pretty much the old Holley design rip off. Accufab doesnt use seals either on majority of there units just pressed bearings. I'd have to digout and look at the China 75 I have in the parts piles to see if its machined enough to fit a seal. Used to be a bit cheaper but around $80 now for them.

https://www.ebay.com/itm/158071046116?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5335821607&customid=&toolid=10001&mkevt=1

Looks like someone is blowing out Macs old inventory and they have the 70mm.... Looks like it has a teflon seal on top of the bearing in the pics?

https://www.ebay.com/sch/i.html?_ssn=losangelesmotorcyclesalvage&store_name=losangelesmotorcyclesalvage&_oac=1&_trksid=p4429486.m3561.l170197

gkomo · Sep 5, 2026

Black would be cool but I have no need for a 90+mm TB. Scuff and paint would work. I also don’t really care for chrome/polished parts.

Qtrhrse23 · Sep 11, 2026

Paint her black. Yea I know won't look as good.

On a side note, HELL OF A FIND. Never seen BBK TBs leak air, BUT IT MAKES SENSE. Seal will eventually leak.

JUST WHEN I THOUGHT(KNEW) IT ALL. It's gotta be rare. Know at least couple dozen BBK TBs still being used from the 90s.

DadLife0724 · Sep 11, 2026

Qtrhrse23 said:
Paint her black. Yea I know won't look as good.

On a side note, HELL OF A FIND. Never seen BBK TBs leak air, BUT IT MAKES SENSE. Seal will eventually leak.

JUST WHEN I THOUGHT(KNEW) IT ALL. It's gotta be rare. Know at least couple dozen BBK TBs still being used from the 90s.

What are the odds the quality has just gone to since demand has jumped quite a bit since the 90's?

TPs sensors different?

Creomod

Attachments

General karthief

wonder how much it would cost to ship you a pair

rednotch

I'd like to remain having one chocolate starfish

AeroCoupe

lube between the nut and the face. I know my lubes

Mustang5L5

That is…until I whipped out my Bissell

Creomod

Creomod

Creomod

Attachments

AeroCoupe

lube between the nut and the face. I know my lubes

Creomod

AeroCoupe

lube between the nut and the face. I know my lubes

gkomo

now i can hopefully expect to receive the shaft

Creomod

AeroCoupe

lube between the nut and the face. I know my lubes

Creomod

Mustang5L5

That is…until I whipped out my Bissell

rednotch

I'd like to remain having one chocolate starfish

Attachments

gkomo

now i can hopefully expect to receive the shaft

Qtrhrse23

Active Member

DadLife0724

I vote for a new bung hole.

Similar threads

TPs sensors different?

Attachments

wonder how much it would cost to ship you a pair

I'd like to remain having one chocolate starfish

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

Attachments

lube between the nut and the face. I know my lubes

lube between the nut and the face. I know my lubes

now i can hopefully expect to receive the shaft

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

I'd like to remain having one chocolate starfish

Attachments

now i can hopefully expect to receive the shaft

Active Member

I vote for a new bung hole.

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