Loyalhondahaver

I am looking to do a mini me on my 5 speed 99 Civic DX.

I have a auto 96 ex parts car the Head and (auto) IM will come from.

Can I use the 3 wire IACV with my Y7 TB (Y8 rotor and spring) on my auto Y8 IM with a P2P ECU?
Will the 2 wire IACV computer communicate properly with the 3 wire IACV?

Reason for doing this is to see if I can get away with out sourcing a 5 speed IM or doing the auto to manual IM conversion (add IACV on back), also so I don't have to mess with the female IACV plug.

I know that if indeed the P2P ecu does accept the 3 wire style IACV the orange wire would still be disregarded and I would need to move pin A14 to A12 and unpin A13 and leave it loose.- Correct me if i am wrong.

Thanks in advanced for your time and knowledge.

eghatch9295

iTrader: (1)

auto y8 should be a 3 wire iacv.

Loyalhondahaver

Yes, y8 auto, it's is a 3 wire IACV on the bottom of the TB. I guess I could even use the y8 TB instead of the y7 with swapping the y8 rotor and spring to it.

This doesn't really help me though.

eghatch9295

iTrader: (1)

you didnt specify if the ecu was at or mt. if mt, then no you need a 2 wire.

Loyalhondahaver

Sorry about that, the ecu is manual obd2b. Are you speaking from experience here? Why do you say this? The 3 wire IACV will not do its job if its missing the orange wire? I suppose finding out what that oranges wires job is would give me a grip of an idea.

eghatch9295

iTrader: (1)

3 Wire to 2 Wire IACV Conversion for 99-00 Civic

eghatch9295

iTrader: (1)

its not as simple as just removing a wire.

Loyalhondahaver

I got one thing wrong, these notes are for a 96-98. Thanks, the link you sent me gave me the correct info.

I knew it wasn't as simple as removing the orange wire, as you can see from my quote.

From your link, I have also learned that the orange wire is a ground, 3 wire IACV uses a ground and 2 Wire does not.

My question is still unanswered though.---

Again, thanks in advanced for any help.

HondaPartsHero

No you have to use a two wire iacv.

94EG8

No. You'll end up with an idle that fluctuates between 900 and 1500 rpm. The two IACV styles are not compatible at all.

You can use the automatic Y8 manifold and throttle body on the Y7 and retain the Y7 ECU if you want and it will work marginally better than a stock Y7, or you can get a 5 speed Y8 intake manifold, throttle body, head and ECU and do a mini-me. I don't think you're going to to be all that impressed either way, especially without a Y8 tranny, this in and of itself is the biggest gain you'll ever see on a D-series.

Loyalhondahaver

Awesome! Thanks. I do have a Mini Me in the works, so using the p2e ecu would not be plausible.. I've heard of people using the p2e ecu with their mini me that used a vtec switch of some sort.. But that sounds funky, because the y8 uses the bigger injectors.

I bought a parts car for 200 bucks and have already got my money out of it a few times.. The head and harness will be used (stealing wires to add to my obd2b harness for a OEM finish). Located a p2p obd2b ecu for 20 bucks! and a manual 96-98 IM for 25 bucks with a z6 IACV. Just need throttle body now.. I also have a freshly rebuilt OEM LSD D series tranny from a VTI just layin around.


I have read atleast ten times the z6 iacv is the same as the y8, and 10 times that it is different, either from the plug design or the mounting design. I guess I'll learn for sure soon.. I'm hoping to get away with the z6 IACV that will come with the IM for a measly 25 bucks.

94EG8- Big thanks.

94EG8

IIRC Z6 and Y8 IACVs are the same, if it bolts up it will work, the 2 wire ones all function the same, most of the B-series ones work too, just not Type R as the mounting ears are different.

tony_2018

I don't believe the vti came with oem lsd because it had the d15z7 engine, not to mention my tranny didn't come with lsd so you could be mistaking it for another.

Loyalhondahaver

I suppose I can use my y8 auto TB and leave the IACV mounted and unplugged. I've read of people having idle issues this way but I've read more so that it will work fine..

And about tranny,

Did the vti-r (forgot the r) not come lsd? I could and very well may be wrong about my tranny, I know for sure it's LSD and trust the fellow I got it from, he says its OEM but he may be wrong. He couldn't tell me what car it came from, googling- the European VTI-R seems to be the only d series that came with a factory LSD.

Loyalhondahaver

Well, apparently the JDM ZC and JDM D15B also sometimes came LSD. I could have one of those.

tony_2018

Those engines weren't from a vti, I've check the hondas parts site.

ej8

You want the IACV to be working, it does more than just make your car idle properly while parked. 3-wire ECU must use 3-wire IACV, they work much differently.

If going the 2-wire ecu/IACV route just check the mounting holes on the intake manifold to see if they are 2.5" or 3.5" and that will tell you the valve to use. The other differences are in the plug location, coolant pipe location, and some use a different length bolt for one of the mounting holes.

Loyalhondahaver

Thank you much all!