this is my new intake manifold i recnetly bought. i dont know what is supposed to plug into this hole?

on my old manifold theirs a L shaped peice that screwed into it, and it was just open. look slike a tube was supposed to slide over it, however i cannot find any loose hoses..

i checked vaccuum diagrams and they dont help. anyone know?

 

The only thing that I can think of is some kind of air temp sensor, if we even have them on tbi systems .?.?.?

 

I believe thats where the threaded vaccum line for the brake booster goes at least thats what I have plugged into that hole on my performer RPM.

 

i believe the brake booster is plugged into the hole in front of the right bore?

keep in mind, this is also on my stock TBI, and its missing a hose to it.. its just sucking in air without any filter... so i know something must go their.

anyone with a tbi mind checking what is attached their and where it runs to? thanks!

 

That is a manifold vacuum port. on my 88 LO3 it has one hose going to a vacuum brake and then, a tee. the port on the tee going to the drivers side connects to the cruise control vacuum diaphram next to the radiator. the tee port going to the pass. side go's thru the firewall under the MAP sensor to operate the vacuum controled duct doors for your heating, defrost, and air cond. vents. If you don't know what a vacuum brake is, it's desinged to restrict the amount of vacuum going to other diaphrams with limited vacuum capability's so they won't be over-powered by constant high vacuum. so don't just hook up the hoses without the brake installed.

 

im confused then. it goes into a Tee? where does this other hose go to that it gets tee'd into?

 

The vacuum fitting comes out of the intake, then into one side of the vacuum brake, out the other side of the vacuum brake to a T fitting then one hose to the cruise control diaphram, and the other side to the firewall.

 

Ok I'll take a pic tomorrow & post it to better show the explanation ok

 

Just look at your stock intake and take out that plug and put it in that hole on the edelbrock intake. Nothing is relocated on that intake. It is a direct plug n' play.

 

i know that, but im saying, even on my stock intake thats on my car right now, their is nothing that is pluged into that hole.

 

it is for the brake booster. the booster need manifold vacume, not ported vacume.

 

well then.. if its not plugged into even my stock manifold since *** knows when.. is it bad? my breaks have worked fine.

 

That is not for the brake booster, the brake booster is located on the front side of the raised TBI section. The threaded hole you are talking about is in fact for manifold vacum. You should have had a fitting on the stock manifold there that hooks up to the small vacum hoses that run along the rear of the engine. I would post a pic if I had it, but I just put on that Performer TBI last week and that is def what that thread is for...manifold vacum.

 

is it important?

 

If there's nothing there on your stock intake, it's a gimmie!
CAP IT OFF. You posted what goes there? And we told you!
Evidently, your new intake is a dual purpose application for 700-R4 and T-5. Actually, I'm surprised the intake didn't come with a brass plug for the T-5 application. You might want to dig in the carton it came in and see if you didn't overlook it. It should have had a small plastic bag with easy install intake gasket bolt hole locator's, and a brass plug along with the port gaskets and front-rear rubber gaskets. You might have been the victim of a lazy packer that didn't bother to put it in the box! (his name might be Jose). Anyway, if it didn't I would call and tell them and tell them about it. You paid hard earned money for that and shouldn't have to run all over town looking for a plug for an incomplete kit!

 

well on my stock intake, something was supposed to go their, their is an L shaped adapter screwed into it where a hose is supposed to just slide over it.

I am still not clear the purpose of it is. manifold vaccuum???

 

I have a pic of my edelbrock intake in the "new to TBI" thread at the top of the page. You will see the adapter that must come off of your stock intake and plug into that hole. As v8nate92RS said that is not for the break booster.