DIY How to run a 2 wire IACV on a auto d16y8 manifold - D-series.org

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Old 06-24-2014, 08:13 PM   #1 (permalink)
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Default DIY How to run a 2 wire IACV on a auto d16y8 manifold

I had found a write up to do this already, but it was not correct so I decided to make my own. Hope it helps a few people out!

Here is my guide on how to properly convert your d16y8 automatic intake manifold to run a 2 wire IACV with just a few tools. As you likely already know all auto ex 96-00 civics run a 3 wire just like on the d16y7, and the holes are blocked off. Which is why I'm making this thread. Lets begin.

Tools needed:

Drill
Center punch
m8x1.25 tap
Drill bits - 11/16, 17/64, 11/32, 7/16
12mm wrench

Other tools can help aid in this task but that is a bare minimum list.

So take your 2 wire IACV and slap some grease on it like I did here, put some on the bolt hole that we will be tapping too. Bolt it to the manifold using the one existing hole that honda was kind enough to do for us.



You'll end up with this, a nice template to start with.



Now take your center punch and punch divets into the center of the IACV holes, this will help with drilling accurate holes and keep your bit from walking.



Next take your 11/16 drill bit and drill the pilot hole for the bolt hole you will be adding. After the pilot hole use the 17/64 drill bit to prepare the hole for the tap. I marked my drill bits with tape to make sure I didn't go too deep.



Next you will take your m8x1.25 tap and center it in your open hole. Make sure to apply some lubricant before starting. Start threading the tap into the hole, cleaning it about every 3 turns, until you bottom out.



You will end up with this, a nicely threaded hole.



It took a few test fits to get my hole deep enough, I was being careful not to drill into the plenum, but after all said and done I went just about .490" deep.



Next we will drill the hole furthest from the throttle body, this is the easy one. Just drill it straight through into the plenum. I started with my smallest drill bit (11/16) and worked my way up to the largest (7/16). I appologize for not getting pictures of me drilling this hole, but this is the hole I'm taking about.

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Old 06-24-2014, 08:14 PM   #2 (permalink)
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Next you will be drilling the hole directly next to the throttle body, this one is a little bit more tricky but still easy nonetheless. I went just about .500" deep on this one, you have about .890ish of material before you pop through so not much to worry about on this one. Once again start with your pilot hole and work up in drill bit size.



Now you will be drilling into the throttle body mating surface. Use a throttle body gasket as a template and then divet it with your center punch, my manifold had a nice dirt spot on it so I just went by that. Take your 11/16 drill bit and drill the pilot hole into that 7/16 hole you just made (you need to slightly angle your drill bit to meet up with the large hole).



Next use the 11/32 to punch that hole out to a larger size, you will end up with this. (The manual manifold has a larger hole but I think this should work just fine, but you could always go to work with a dremel to make it look nicer if you wanted.)



Heres a shot from the other hole, sorry for the poor quality I couldn't get my phone to focus on it.



You are pretty much done now. I used a 3m pad to clean up my mating surfaces. You should also debur if needed.



After I was done I slapped some more grease on the IACV to make sure everything lined up, and it did.



AND your final product! Go out and buy yourself a case of beer with the money you saved converting your manifold instead of buying a 5 speed piece.



I should not that once you are ALL said and done with this you will need to clean out your manifold since you will have metal shavings in it. Even if you used a vacuum to try to catch everything I would still clean it out with soapy water or in a parts washer.


I hope this thread helps some peo
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Old 06-24-2014, 09:30 PM   #3 (permalink)
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pretty coooool!
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Old 06-25-2014, 04:26 AM   #4 (permalink)
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Now that's a proper conversion!
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Old 06-25-2014, 04:58 PM   #5 (permalink)
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Thanks guys! I plan to do a few more write ups during the build im currently doing.
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Old 06-26-2014, 04:54 AM   #6 (permalink)
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looks oem great job
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Old 11-17-2014, 02:18 AM   #7 (permalink)
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Very detailed. Nice write up.
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Old 11-17-2014, 07:15 PM   #8 (permalink)
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Very nice and detailed write up. Thanks!
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Old 11-18-2014, 06:47 PM   #9 (permalink)
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Nice diy work out
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Old 01-26-2016, 03:34 AM   #10 (permalink)
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We're me write up bro! Thank you I think I'll do this instead of getting a manual!
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