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96 Civic DX D16y7
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Discussion Starter #1 (Edited)
Ok I know there are a bunch of threads on IAC differences between the Y7 and Y8's. But I have a Y8 with an auto manifold(So no place for a IAC) with a Y7 Throttle body currently running on a Y7 ECU. I'm wanting to swap my Y8 Manual ecu in my car. But do I have to swap in the Y8 manual manifold? Or can I use the Y7 Throttle body/IAC with a Y8 manual ECU(< Thats my Real Question)???? If so what do I do with the extra wire on the IAC and will it work properly????
 

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You don't "have to" find a manual manifold, you can drill out the passages needed for the IACV and rud a 2 wire IACV. A 3 wire IACV won't work with a 2 wire ECU and a 2 wire IACV won't work with a 3 wire ECU.

It was really easy to do
Only needed a few tools

12mm wrench
1 tap size M8x1.25 this was on loan from CrazyMX6 thanks homo lol
1 drill bit to drill a hole sorry i dont know the size of the bit, cause the marking were wore off. Anyone know the correct size so i can post it here.
1 drill bit to drill out the holes for vacuum for the iacv
1 shop vac. or house sweeper
and a drill cordless or electric



Well here is what we have the all famous auto y8 mani, as we all know the auto mani uses a iacv that on the tb eww gross lol.
So lets change this shit over to run a proper iacv.



First what i did was go ahead and use the one hole already there and bolt the iacv on to the mani. Make sure you line it up real good or really close to good.


Sorry I missed a pic here. but with the iacv still bolted to the mani go ahead drill a hole that you will tap. I left the iacv on so i can yuse the hole as a centering guide that way it was striaght and didnt get cockeyed while i was drilling. Also I didnt drill all the way threw the manifoldI prob went im guessing 9/16 deep. Enjoy my pic lol


Next get the tap and a wrench and center the tap right in the middle of your hole. With it sitting straight up and down use one finger for downward pressure, and your other hand for turning the wrench. Once it starts to make threads you dont need any pressure let the tool do the work. Turn it till it stops, back it out some and work it back and forth.


Now with the hole tapped go ahead and test it out make sure u didnt mess up lol


Now with the iacv removed you can see to oily rings that were left by the gasket. Locate the center of each ring and starting in the center with the drill bit you used to drill your tapping hole and drill all the way threw the intake manifold


First set of holes drilled
Also when i drill these holes I put a vac hose in the mani to catch most of the shavings


Then i used a bigger bit to make the holes bigger
 

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Sorry posted that thread before reading it, there is some misleading info in it. The first hole closest to the throttle body should not be drilled all the way through the intake. It should only go about half way through and then you may have to drill a passage from the mating surface of the throttle body opening to meet up with that hole. On my auto y8 manifold I had a passage already there.
 

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\/ apply baby lotion here \/
'98 Civic 4 Door
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the answer to you question is NO, you can't run a y7 TB with that 3-wire IACV under there and a y8 ecu...

You will have to buy a y8 manual TB, (drill your y8 auto IM or buy a y8 5spd IM) bolt that IACV on the rear of the y8 IM and for the wiring all you have do is convert to a 2-wire IACV plug and de-pin a couple of wires to your 5spd p2p ecu. That's all. No big deal :biggrin:
 

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96 Civic DX D16y7
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Discussion Starter #6
Ok thanks guys I'm going to trade with a buddy of mine who need an auto manifold cause he's using a manual one on a Y7. Will make it better for the both of us.... THANKS!!!!!!!!!!!
 

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You need a manual throttle body and y8 2 manual manifold if you don't want to drill the holes in intake manifold. I've already swapped tranny from auto to manual and 2 years riding with auto ecu and 3 wire iacv with no problem, but i'm going to swap it now for manual.
 

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i have been thinking of starting my own project however am confused between going with my older civic http://talkativetown.com/cars/88_civic/ or dumping it and getting a bit newer model and then doing engine swap. currently the net i have kept for the project car is around $5000. i guess the entire selling and buying new one will itself cost around 2k-2.5k rest maybe with engine. however if possible i would really like to pep this old beater of mine.
 

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GREAT pic layout. I am running a similar issue since I have a 94 VX, I did a D16Y8 swap with 11:1 compression motor but the Y8 manifold is from an automatic (same with the ttb). SO... What you're saying is that I can drill the whole and use my old iacv from my d15b7 and it should correct my MIL and idling issues right? Since I obviously can't do the three to two wire connection.

^^Sorry I forgot that I would still have to find a manual Y8 ttb too...
 

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I just google searched my issue and this came up. Since I have an account on here this is what pulled up. The set-up worked for me tho at least it helped.
 
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