Baically all the iacv does is check engine temp through the coolant and the incoming air, and when the temp is lower it will raise or lower the idle accordingly. (If am wrong, please correct dont wanna spread false info. I was wondering if there is any way to wire maybe a potentiometer (or anyother way to regulate voltage), to change the voltage going to the ecu so the ecu would get spoofed thinking it was colder or hotter so it would idle at the point you have it set, instead of having the ecu idle search. This is just something i was thinking about, since my iacv just ate ****

 

I am not positive, but my friend did this, and it seemed to work okay. All he did was connect the sensor, and then instead of bolting the iacv to the back of the intake manifold, he ran the two hoses that carry coolant to each other, and there wasn't any codes or anything, but he did say that it would idle low when it was cold out, but after it would warm up it was fine.

 

Are you sure you're not confusing the IACV which is electrically controlled, with the idle thermo-valve which is heated by coolant? (Maybe I've got their names mixed up...)

The thermo-valve gives you a faster idle till the coolant warms it up. Your ECU controlls the IACV to hold your idle steady while you turn stuff on & off; like A/C, lights, stereos, & the drag caused by your power steering...

 

Thats right you got it, my bad , like i was asking earlier do you guys think that there would be a way for me to adjust the idle my self, by some how bypassing the unit.


[Modified by dwn-shift, 10:30 PM 4/1/2003]

 

If anybody is wondering i want to set this up on my 91 lude, these ludes suck at idling. Well i figure regardless my iacv is messup up. With it hooked up it will idle like ****, when i disconect it is runs somewhat fine. (i tested this with the engine at running temps). So i just need to find a way to get it to idle higher on cold starts, since it idles fine without the iacv at running temps.

 

That actually sounds like your idle thermo-valve is the one that's messed up... The one with the coolant hoses, not the one with the electrical plug.

But wait... I don't have a Lude, so I just figure its 'similar' to my Teg.

 

I have the same problem on a B16 lemme know what you find out. How much is it to just replace the IAVC???

 

I need to check my gsr later to if its the same i dont remember, but on the ludes iacv there is both coolant lines and the electronic conector.

 

When the car first starts does the iavc have its own valve to let air in, or does it send a signal to the tps sensor which then lets more in.

 

for my 90 integra the iacv is $220 new. the fast idle valve is controlled thermally. there is a wax device inside that when cold is contracted and lets air in the port through the throttlebody thus raising the idle. when heated it expands and closes the port.
the iacv has coolant lines but also sends a signal to the ecu. i would also like to manipulate this cuz with my solid motor mounts my idle with the brake depressed or a/c on is horrid. i have to leave it in neutral and step on the gas a little when i have passengers. adjusting the idle screw doesnt help.

 

Well guys i am going rig some stuff up tommorow to see if i can find a way to maniplate this peice of **** . I will keep you guys updated.

 

The TPS is just a sensor to tell how far open the throttle is. It doesn't have any ability to actually move the throttle plate.

The IACV has its own little valve to let air bypass the throttle.

 

I have(iacv) one for a b series motor. Im in atl I will ship it for $100.
Call me on my cell 404 583 5811
mike
I bought this for my teg but wasnt the problem.

 

The IacV lets Bypass air in from one of the holes thats in inside your throttle body (before the throttle plate, the other opening is for the thermo valve), it lets that air into the manifold, through an opening in the manifold, to raise the idle when you turn stuff on, like someone earlier stated. Ive been thinking about rigging up something so my Iac works with my DFI.

 

i was just having problems with an IACV valve and found these links and found them useful in my solution, although it did not provide the exact solution.
My prob was during a dpfi to mpfi motor swap into a crx...
they have good info that may help point you in the right direction.

http://www.g2ic.com/forums/showthrea...threadid=42969
http://www.g2ic.com/forums/showthrea...threadid=44386

 

i was about to post that hehe. this is the link for the actual cleaning http://www.g2ic.com/forums/showthrea...threadid=35534