Today i was in the process of finding out the vacuum diagram and where the valves on my b18b1 motor would connect to. So far i think i have everything right until i stumbled upon a valve that was not connected to anything. If i'm correct i think this is a coolant walve and it sits under the throttle body/intake. Would anybody know where i could plug this up to or can i plug it off with a vacuum plug?

 

I already told you what it was... It's a FITV (Fast Idle Thermo Valve). Here you go though...

https://www.hondapartsunlimited.com/...ER%20HOSE%20(2)

Unless you block it off with a plate (even then) you'll be sorry if you don't hook it up properly.

 

Alot of people have told me it some coolant valve but I'm just double checking to be sure

 

What you can do is remove the coolant line, open up the cap, and there's a large plastic nut inside it, thread the nut all the way in, that blocks off air through the FITV (it's all the way in, or all the way out, I can't remember, it's been ages since I played with one of those).

Note that if you do this you're messing with the cold idle, but unless you hook it up you're messing with the cold idle or the warm idle, either way My preferred method would be to block off the FITV in the method I described or by using a plate, and then tune the car's cold idle/warm idle to remove the reliance on the FITV altogether.

 

Screw the ceramic plug IN = LESS air

Back the ceramic plug OUT = MORE air

Hence when it backs itself out over time you wind up with an internal vacuum leak resulting in a very high idle.

 

If I'm right the fitv connects to a port on the intake manifold but there is a problem there is no port on my intake manifold for it to plug into

 

But it's a coolant line?
Here's a few pics in this thread.
GL

https://honda-tech.com/forums/acura-integra-6/%2A%2A%2A-how-%2A%2A%2A-clean-your-fitv-aka-fast-idle-thermo-valve-1564019/

And more on the hose routing... different engine, but the same concept

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/fast-idle-valve-2591452/

 

If it helps it's a p75 intake. Could this be a different intake than on b18b1

 

Well i did some thinking and had an idea. If the fitv is suppose to have coolant running to it why dont i have some hose and lengthened it to fit on a coolant port. Would it work?

front the fitv to the coolant port

 

Why not just buy bulk hose and do it right?

Head -> FITV In
FITV Out -> IACV In
IACV Out -> Coolant Pipe (on back of block)

You are making this way, WAY, WAY more difficult than it needs to be.

 

I have the fitv out-> iacv in and iacv out-> coolant pipe(on back of block). I dont even see a spot on the head to where the fitv in is suppose to go to. My intake manifold that i have is off an obd2 b18b1. If you had a pic of it that would really help alot.

 

What does that have to do with anything? You posted a picture from the water outlet - take it from there... (that would be considered taking it from the head.)

 

Ok i just wanted to check and be sure. Thousands of people on different forums have told me different things that i should do and i wanted to check and be sure that its right.

 

Think of the way the coolant flows in the system and you will see it makes perfect sense. Essentially you are forcing it to pull it from the upper radiator hose and into the stream of the lower hose thus completing the cycle.

Also, I know everything just ask me how I know. Ok, ok... I am only full of myself a little.

 

Thanks dude i appreciate it. This is my first honda and my first ever build so i wanna make sure i do it right. if you have any helpful tips on what i shiould do with the fitv valve or with my build i'm up for any options

 

my d16a6 has this, goes from manifold to tb to iacv to head
I bypassed it from manifold to head and clossed off the throttle body iacv
supposedly the intake charge is cooler more hp

 

Amoc do you have any pics

 

not right now.
What engine do you have?
Just buy hose and route it from the head to the manifold
then you can route some hose from the iacv to the throttle body
so air can flow in there
I live in california though, the coolant in that area is meant to keep the throttle body from sticking in cold weather. So if it'd really cold where you live I might not do it
A downside is that cold idle jumps to 2000k from 1500 because there's no coolant
Lasts only until he car warms up

I'll try and get some pics tommorow

 

Ok cool