Air bypass control thermal valve nipple snapped!

devilution · Sep 4, 2007

hey guys, while installing my new rbc intake manifold
the black plastic nipple on the intake air bypass control thermal valve snapped off. http://www.karcepts.com/index_files/K-IM-RBCA/K-IM-RBCA%20Installation%20Instructions.pdf as shown on page 10.

but yea was jsut wondering wat this actual valve does? does it hav a sensor or sum sort inside it? is there a another way i can replace this valve? as buyin from honda is quite expensive
cheers guys :up:

911/RSX-s · Sep 4, 2007

It bleeds extra air in around each fuel injector until the engine coolant warms up. I suppose this helps to mix the air and fuel a bit better while everything is still cold.

Your car will run without it. Plug the nipple on the manifold and the nipple on the airbox/intake. Or buy a new one. There are some online Acura/Honda dealers that are a bit cheaper.

k20eg6 · Sep 5, 2007

you can buy another one took me forever to find it cause honda does not part it out of the water assembly...

but as he said above ive read that it will still run with out it

but out of curiosity

ive seen people plugg the water outlet where the iac valve used to be with the thermo unit or the temp sender? whichever one it was how do you go about plugging that water outlet inlet or the actual nimmple on the manifold?

i see everyone just diff bolts for the hole and little plastics caps for the nipple

what is the thread size for the inlet?

JasonMann · Sep 5, 2007

I ran with a broken one for a while. The idle is higher, especially when it is cold. I finally replaced it and the difference is minimal.

talonxracer · Sep 5, 2007

Air Assist Valve: This valve allows for a faster warm-up in cold weather.
When the coolant temp is at 147 degrees or BELOW the valve is opened.
The air enters the AAV from the intake tract and routes the unmetered air thru a nipple on the IM, which feeds a cavity in the head behind the IM gasket, and then back thru the IMG and into ports in the fuel injector bosses in the IM. This allows for a leaner mixture, thusly a quicker warm-up.

Here is a picture of a coolant outlet assembly.

The AAV is available in two ways. You can buy the whole coolant outlet assembly for a EP3 (here...part# 9 https://www.hondapartsdeals.com/hon...p_series_transmission=5MT&hp_series_slsareacd=KA&hp_system=A&hp_component=E++15 )

or you can get just the AAV by ordering one from a 07'Si ( here...part#8 https://www.hondapartsdeals.com/hon...series_transmission=6MT&hp_series_slsareacd=KA&hp_system=A&hp_component=E++0301 )This will require you to remove the coolant outlet assembly to remove/install the AAV if the horizontal leg is not broken.

The AAV is NOT required to be functional for your engine to operate correctly. If your AAV is damaged you do NEED to remove/plug the lines that go to it from the IM and intake. Your car may take a bit longer to warm up when it is real cold but that is all.

Another option is to remove the AAV and install a electric coolant temp probe there for a aftermarket gauge.

Doug

devilution · Sep 6, 2007

omg thanks so much for that!!!!
ur a big help and cheers for every 1 elses help!!

Thang · Sep 5, 2007

****ing nice information Doug!

Andrie · Sep 5, 2007

I have the part with water neck still attached. Will sell for $40 shipped to lower 48 states

JasonMann · Sep 5, 2007

So it isn't necessary to have. Just necessary for those who can't let their car idle for 5-10 minutes before they leave.

In your picture, what did you replace it with? A water temp sensor?

talonxracer · Sep 6, 2007

JasonMann said:
In your picture, what did you replace it with? A water temp sensor?

Yes

k20eg6 · Sep 6, 2007

what did you use to plug the nipple on the intake manifold? i see people use these plastics nipples to cover them, but dont knwo where to get them or even what size

911/RSX-s · Sep 6, 2007

Any auto parts store will have various rubber caps to plug such nipples. Buy a variety pack and have a nipple party . . . or just take the hose in with you to get the right size.

hydrokracker · Sep 11, 2007

does anyone think it would be possible to use this threaded hole for a nitrous port? the one in the intake manifold i mean not the valve assembly hole

kyle10182 · Mar 5, 2008

the threaded hole would tap into the coolant susyem, not the intake.

Mr_Plenty · Sep 12, 2007

nice quick info...always heard about these things breaking...

K20Wannabe · Mar 11, 2008

I was wondering if you guys know what to use as a threaded adapter for the hole that the AAV is in to insert a water temp sensor or the thermo unit? thanks

Paul1985 · Apr 24, 2008

Where is the AAV located on a K24A engine if it has one?
The water outlet on the K24A engine doesn't have an AAV on it.. Only a nipple for coolant flow on the IACV.

Just out of curiosity.. I wish i had a K24A manual.

talonxracer · Apr 24, 2008

The AAV on the K24A2/4 is on the fuel injector section of the intake mani.

And here is the best place i have found for finding where parts are located at on any vehicle with a K24 in it. https://www.hondapartsdeals.com/hon...series_transmission=5MT&hp_series_slsareacd=KA&hp_system=A&hp_component=E++0310

xTyReaper · Nov 5, 2011

Great Help!
I ran into the same problem, damn nipple snapped right off somewhere along the way. Also not paying $66 for something I don't need. However I am interested in the coolant temp sensor idea. Do you just get an OE cts that threads right in or do you have to get one specifically for that. If so, where can I find it?

Noobiemcnooberson. · Nov 5, 2011

Ktuned makes the temp sensor adapter

KidnKorner · Nov 5, 2011

I broke mine installing an intake on an EP3, I used super glue to fix it and ran the vehicle trouble free for 6 months before I gave it up to take a job in Kuwait.

Aerodynamic · Aug 31, 2013

Anyone know what thread size it is on this water coolant port bybass valve.

I thought I put a plug in there instead of the valve.

BR, Per

dantok · Sep 1, 2013

If i remember it, it was 5/8" for the plug. But it's better to bring it to a store to check. I plugged mine as well. No leaks!

F-BOM · Sep 1, 2013

It should be a 1/2" npt thread

Aerodynamic · Sep 17, 2013

To answer my own question. The thread has 19 threads per inch.
So it's a 3/8 G thread which I belive is the same as NPT.

Br, Per

Air bypass control thermal valve nipple snapped!

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