born2sleep13

I have a 5spd Y8 intake manifold going on my Y7 head but am having trouble finding a throttle body that will work. these are the 2 I currently have.



The 1 on the left came off a Z6 mani (I think not 100%) The right is off the old Y7 with the spring turned around to pull the correct direction.
All the ports match up on both and the have the same MAP and TPS sensors, but the one on the left is a little crusty and doesnt like to open.

More info on my setup: I'm using the Y7 harness with the 3 pin IACV, and a 5spd P28 ECU. The Intake Mani has the 2pin IACV on the back side.

I'm also unsure about how to run the coolant and vacuum lines.

Any input will help, thanks.

Arthas

Dont worry about the coolant lines to the TB, you dont need to use them. You cannot run a P28 with a 3 pin IACV because the P28 reads for a 2 wire. Best bet to use the P28 would be to convert the harness to a 2 wire IACV and use the 2 pin IACV.

I have a similar set up; im running a 5sp Y8 intake manifold on my Y7 as well, but im using the Y7 TB with the 3 wire IACV and the stock Dx ECU. Works fine with no CEL.

So you have 2 choices. Convert to 2 wire, and use IACV on manifold with P28 or Leave it 3 wire, use the TB on the right, and plug up the OEM ECU.

Arthas

Took some pics for you. Hope it helps.



Y7 TB, Y8 throttle cable bracket, Y7 throttle cable

Y7 IACV. Y8 IACV is only there to plug the hole.

born2sleep13

Yeah sould have mentioned I'm finishing up a auto to 5spd swap so i have the auto ECU in now thats why im thinking to put the P28 in cuz it's a 5spd. I have the jumperharness so would i still need to switch to a 2pin IACV?

born2sleep13

And other thing unsure of these to vacuum lines and couldn't see from your pics I know 1 is PCV but dont know the other one.


I know the small one on the left is FPR

Arthas

Doesnt matter, P28 only reads for 2 wire IACV so if you want to use it, you will need to move a few wires around on the harness plugs.

Why dont you just get a 5 speed Dx ECU? You know you will need to have a Y7 basemap in order for that P28 to work. It wont be plug and play.
The top one is for PCV like you said, but the bottom one goes to a small 2 way valve that is mounted on the fuel rail, then the other end goes to the charcoal canister on top of the subframe. But if you go OBD1, you wont need to use it so you can just plug it. Also, dont forget the nipple behind the manifold. Either plug it up or connect your cruise control to it. I had it open for about a year and I had a shitty idle.

born2sleep13

With DX 5spd ECU I can leave the 3pin IACV and not worry bout the 2 pin IACV on the back of the manifold correct?

Arthas

Correct.

born2sleep13

Thanks for all the info
Do you know the code for the 5spd dx ECU?
P2P or P2E?
And does it change for years or is it all 92-00?

Arthas

P2E=Dx
P2T=Si

Make sure you get the ECU correct to your car year. 96-98 is OBD2A, 99-00 is OBD2B.

grumblemarc

iTrader: (4)

Y8s (EX) are P2P.
P2T is the SI.

born2sleep13

But the Dx is still P2E right?

Arthas

My mistake you are correct.

OP yeah its a P2E. What year is your car??


Ive been using a B16A2 ECU on my Y8 this whole time. FML. Im surprised the engine never blew for the year I had that ECU on there.

born2sleep13

My car is a 99

Arthas

Use an OBD2B P2E.