I searched everywhere. It's not in the FAQ. It's not in the Helms. It's not in any vacuum diagram I could find anywhere on the net. It's not even in the EF service manual or suppliment.

I hooked up a vacuum gauge to the top port, but it gets nothing. The bottom port and the port that is protruding from the part where it is closest to the throttle body get just a tiny bit of vacuum.

So I must ask. Does anyone know what this thing is attached to my intake manifold?

 

What engine is that? Looks like that mani is from a da integra

 

It's a B16 motor. I can't confirm which manifold it is because the motor was already in the car when I bought it.

 

Well the mani is from a b18 ls motor....you dont use that diaphram on the b16 which is prolly why its capped off

 

OK.

I just want to know what it's for.

Maybe I should ask in the integra forum

 

well now this is wierd. I just found this on www.hmotorsonline.com

maybe it is a real B16 IM???

Anyone else have an idea?

 

Mine had that too, its just for emissions.Dont remember what it does but thats why its there.

 

well, I pulled it off. I can blow straight through the bottom thing that curves up. I can also blow straight through the same port where it would line up with the hole in the IM. The top little port is completely clogged. I opened it up, and there is some kind of diaphragm inside.

Not really clear how this would effect emissions.

Bump for anyone who knows.

 

Took it apart. The little hole wasn't clogged. Did some messing around with it, and any time I blow into the little hole, it closes the diapharagm so that nothing can flow between the IM and the big nozzle. This means that it restricts vacuum any time whatever was hooked up to the little one would show boost. I'm guessing the little one is supposed to connect to something pre-throttle body, but it still doesn't make any sense! It looks like it just goes from one vacuum source to another on the IM. This makes me wonder about what the top nozzle on the IM is for. Maybe it isn't a vacuum source at all. It must be something driven by the vacuum source coming from this diaphragm, but what?!!!!!!

WTF is this thing?!

 

WHAT? b18 intake manifolds aren't the same bolt pattern as b16.....

non vtec heads have a different intake manifold flange, there is no way that is an LS(b18a) intake manifold.

Regarding the question, I have something like that on my d15, controls idle speed. no promises its the same in this case though but it might be what the FITV replaced on obd1 throttle bodies.

 

Okay, this got me wondering. I'm not usually into Hondas of this generation, so I was at a loss.

But I did some digging around through parts catalogs.

Turns out it's called an air boost valve assembly.

Here it is on a '90-'93 Integra B18A (number 12).



Hope this helps.

 

Awesome! You are the man! We have progress. Thank you.

Now... WTF does it do? LOL

Does it help that when I got the car, the ECU had the letters "AT" written on it? I cross referenced the ECU part number stamped on the side of it, and it was an automatic transmission PR3 ECU.

Even though when I purchased the car, it had a manual transmission in it, could it be possible that this "air boost valve assembly" has anything to do with automatic transmissions?

Did the B16 even come in AT?

 

Well, I was out scouring the webosphere trying to find info on an AT B16 intake manifold. I found this. It is for a B18, but I think it's the same thing. I guess they did make B16s in AT in Japan only. That's why they never show this part in USDM service manuals.



I guess my concern is mostly how capping off the nozzle on the top of the IM will affect anything. It appears that it is supplying the "additional air from air cleaner." But this all just seems redundant and unneccesary in my opinion. I mean, isn't the motor already getting the full amount of air it can from the intake pipe? How is this little nozzle going to make any bit of difference?

 

take it off cap it off do what ever you want with it it not used. What it does is when the car is being started the diapham moves which the hose goes to another peice that your missing that connects to the throttle body and moving it open a little basicly like a choke for the car. Its not needed and how your manifold is is perfectly fine. I just left it on there and capped it off how you have it.

 

hmmm your right.....i was thinkin of only the gsr being different.

 

Its a jdm integra xsi engine, as everyone else stated, the little booster is not needed

 

Fixed. NOFX is a chick lol

 

Glad to help, aasarsak. Thanks for posing this question since it helped me learn too.
Thanks, but it's no big deal.

 

Oops, my bad. You probably get this a lot, but normal chicks don't use automotive forums. (That's a compliment BTW).

 

Wrong. It is there for a reason. It may not be used with a manual transmission, but it is used for SOMETHING nevertheless.

You really sound like you have no idea what you're talking about.... something goes to something else and makes that do something. Just STFU seriously. Please.

It is nothing like a choke. It in no way is capable of restricting any air flow, which is exactly what a choke does (chokes the airway).

The "peice that I'm missing" is not missing at all. The upper port simply connects to the intake piping. As per the diagrams above.


I don't care if it isn't needed. What I am interested in at this point is learning how that upper port on the IM nearest the TB is routed so I can see if it is a ventilation port for something else inside the TB or IM, or if it is fine to just cap it off.

Who knows how much different the IM manifold ports are on the auto vs manual B16s....

 

There are some on here. I don't notice a whole lot of girls who are "out" in tech, but I'm sure there are more on here who just don't let on about their gender.

As far as the air boost valve, I have one on my '93 Accord EX, which is a five speed manual (stock).

I'd like more information on what exactly it does.

aasarak posted an image above, but it only shows up as "Name: Untitled.jpg Views: 46 Size: 39.9 KB" to me.

 

had the same thing on my B18a1 and i think i took it off


but then i put it back on b/c i didn't want to have a hole in my manifold

 

I took mine off yesterday and tapped it. I put a barbed brass fitting in it and now have it going to my BOV, but I still want to know what the top port is for.

 

Its called a dashpot ... here's a link

https://honda-tech.com/forums/showth...hlight=dashpot

 

you must not have read through the entire post. It's not a dashpot. A dashpot connects to the throttle lever and controls the throttle to maintain smooth idle. Although I want a dashpot, my car never had one when I bought it. The previous owner must have removed it before I bought it.

It is called the "air boost valve assembly" or "starting air valve."

At this point, we're trying to figure out how it works, and what the top port on the IM is for...