preludeh2394

ok so i am swaping in h22a in replace of my usdm h23and i was wondering about the intake manifold. do i need to find a usdm intake manifold so that all the sensors and stuff line up correctly, or will the jdm intake manifold work?
cause as my friend and i work on it we find out that the jdm intake manifold is missin some sensors that the usdm h23 has.

G_Loc

What sensors is it missing? The JDM intake manifold will work... I'm pretty sure its exactly the same as the USDM one

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edludesi

i believe the h23 and h22 manifolds are the same for what i've read before but no sure

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1991 Acura Legend LS Daily
1996 Prelude Si Project
1990 Civic DX hatchback Sold
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red92si

^
The H23 and H22 share the same upper plenum, but the rest of the manifold is different as the port layout and flange bolt pattern is different.

The JDM H22 intake manifold will lack the Starting Air Valve, and will have a block-off plate in its place. Lack of a Starting Air Valve will not do anything negatively to the engine, and won't throw any codes.

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Tyler

preludeh2394

in the picture i show the difference between h22 and h23 and why idk which hose to connect where

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MikeJuvi07

hmmm im determined to find this out too.. I looked at my h23 and looked at my h22 and he is right, the manifolds do have some differences. Also the jdm manifold has a sensor on top of the throttle body where the usdm does not. Can someone clarify this for us?

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MikeJuvi07

Ok I figured it out. If you have a si you need to take the throttle body off the usdm and put it on the jdm. The jdm has a useless sensor on the top and doesnt have a line for.. something Idk what its called but its the hose to the right of the middle big one on the usdm tb, and if you pull it out your engine stalls.

So just put your usdm tb on your jdm manifold and you should be fine.

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preludeh2394

ok thanks mikejuvi
i'll do that right away
but did you also notice this.
under the h23 usdm intake manifold it has these two thing popping out where u can connect. i circle it in the picture provided. i circled it also. and i also provide an upcloser view of it.
as you can see i took that pic off the h23 usdm intake manifold, however the jdm h22 intake manifold does not have it.
that is where i am really stump

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MikeJuvi07

it can't be too big of a deal, try splicing your hoses together lol

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Kyleb1115

just use the JDM stuff and dont use what they dont have, because you dont need it. use the h22 IM and upper plenum, use the h23 TB and use the h23 firewall MAP sensor (cut the vac line short and just connect it on the back, you wont see it) and it will be like you just did a wire tuck. ive been doing this for a long time with no problems. you really dont need what is not on the JDM manifold.

the useless sensor on the top of the JDM TB is the MAP sensor, they are just in a different location. i decided to do the above because it was cleaner...also the h23 TB is larger.

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MikeJuvi07

awesome!

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preludeh2394

so your saying that i should just ignore everything that h22 doesnt have in comparison to the h23 because its unnecesary.?

do you have any pictures?

G_Loc

No they're the same size. Unless you have an auto, in which case I believe there is a difference.

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