IAC Valve Problems

[Guest]

Removed and cleaned my IACV and now my car is idling at 2000-2500rpm even when hot. I also removed what I think is the throttle position sensor from the throttle body and put it back on. Would any of this have any effect on my revs?

This is on a V3 STi Engine.

[BC5RA]

Yes.

[Guest]

O.k, any tips or suggestions on what I should do to fix it?

[Guest Rugged_RS]

noob ass question, whats IAC?

[Guest]

Set TPS output to 0.5v at closed throttle

[DRFVDR]

 Rugged_RS said:

noob ass question, whats IAC?

IAC= Idle air control

I think

it opens a wee bit when throttle butterfly closed so engine will still run

[Guest]

 Ichi Ban said:

Set TPS output to 0.5v at closed throttle

How do i do this?

[Guest]

I moved it around abit and it makes the revs go down. but the CEL is still on and it still plays games.

[Swindog]

 Skellerup4x4 said:

I moved it around abit and it makes the revs go down. but the CEL is still on and it still plays games.

They tend to fill up with dust and some clutch dust depending on your clutch. Take it off and blow some low pressure compressed air into it and try again. If that doesnt work use come contact cleaner. This usually works but if it chuckin faults it may need to be rebuilt or buy a wrecked one. Itll have a number on it, normally on a green sticker, you need a matching one as there are a couple diff ones.

Look at trying this...

Originally Posted by harmonix

Theres 2 methods of cleaning the IAC

Try method one first, then move onto two if it doesn't work.

1) remove the air box which directly connects to the throttle body. Run the car while simultaneously spraying carb cleaner toward the top of the throttle body(10 second spray). You'll need a buddy to keep the car from dying. Let sit for a few minutes. Repeat it a few times then reassemble the intake and let it idle to burn off any extra.

2) On my EJ22 the idle air control controller is located on top of the engine right behind the air box. It has a plug going into it. It's held on by two VERY VERY soft screws. I had to use a thick flathead bit connected to a very small ratchet to turn it. Again, the screws are VERY VERY soft. If you strip them you're screwed.

***when you take it off you'll need to replace the idle air controller gasket. It's like, 2 bucks @ a dealership. ***

I let my IAC sit in carb cleaner for a good hour or so then I cleaned it out with q-tips.

Might be a good idea to reset the ECU afterwards too.

Quoted off an American website.

Pay to check your maf sensor too.

[Swindog]

Pretty hard to stuff it up plus a wrecked one i got quoted was $20.

[Dirka]

Pictures anyone? My mates is playing up in a similar matter. . .

[THUNDA]

mine i.c.v was fucked when I bought the car, it wouldn't idle properly, and sometimes not at all. but car would drive fine in drive. the dude thought the cars engine was fucking out lol, but I knew what it was, took it home, went to pick-a-part, i.v.c was $16, cleaned it up with carb cleaner, chucked it on, BANG engine ran sweet

[pl0x]

 Dirka said:

Pictures anyone? My mates is playing up in a similar matter. . .

Yea id also like pictures, think ive got the same prob,

just i need to know what it looks like lol i went and pulled off what i thought it was and well no

i could chuck a pic up of my engine bay if someone knows what it looks like/where it is

no one has been able to give me a yes/no answer on this yet but mite aswell ask again:

ive got a link g1 does this control idle or is it the IACV hooked up to the link?

im pretty sure the car didnt idle wierd when i first got it so i think the tune is alright?

[Dv8er - FSTWRX]

Not that clear to see, but might help ya

[pl0x]

Um ok where is that on mine:

[Guest]

Just to be clear,On a V3 it is that brown box thing with ABC On it?

[funkytown]

I think that particular peice is the TPS or trottle position sensor.. but just under that yes