IACV removale and leave it out?

**93_jdm_fd** · 07-26-2012, 06:39 AM

Just wondering if I can remove it and leave it out somehow without causing any running problems? Right now when I start my car it idles low cold and higher when warm. I can't drive my car until this valve is opened or closed which ever by the ecu.

**Skym** · 07-26-2012, 07:09 AM

IACV is a automatic choke. It adds extra air to intake plenum on top of what AACV does when throttlebody butterfly is closed. IACV is open and closes as engine warms up (uses heat from engine, hence why it's mounted close to engine, voltage). AACV controls amount of air into intake plenum when engine is warm. You could borrow a manual choke setup from I think was a early 80's Nissan Sentra. That's if you don't mind pushing knob in on dash as engine warms up.

IACV = Idle Air Control Valve, AACV = Auxiliary Air Control Valve

**93_jdm_fd** · 07-26-2012, 07:20 AM

I have a low rough idle when cold so I think the IACV is stuck closed not allowing and extra air into the intake during warm up, once warm it's fine. I might just take it off and clean it out or at least see if something is broken inside. It seems like a pretty fun job to.

**bobbo** · 07-26-2012, 10:51 AM

You have to take the manifold off which is a pain the first time and order the gaskets. Cleaning and testing them is pretty easy assuming you have the manual and I've got a post somewhere here on how to do it.

**93_jdm_fd** · 07-26-2012, 11:22 AM

I've had the manifold off before to reset the throttle stops and do some hose inspections. The gaskets are all brand new so I might pick up some of the spray gasket sealer to lightly add to the gaskets. I want to do it this weekend and don't want to wait two weeks for gaskets.

**bobbo** · 07-26-2012, 05:23 PM

Daryl would likely have them in stock and have them to you VERY quickly. Or your ideal will probably work fine too.

**93_jdm_fd** · 07-26-2012, 07:46 PM

Well it seems no matter what I get in the mail takes weeks longer than normal, lol. I have to try and fix it this weekend. I just can't stand getting up for work and sitting in my car for 15 min while it warms up. It won't let me rev past 2200rpm without stopping on the gas and that I will not do.

**bobbo** · 07-27-2012, 07:02 AM

Wow! Even the mail doesn't wanna go to SJ! Just kidding, I grew up in Quispamsis.
You can't rev past 2200 when the car is cold? Or are you keeping the revs below 2200 as a precaution when the car is cold?

**93_jdm_fd** · 07-27-2012, 08:44 AM

Moving back to edmonton next month and shipping my car out there, a little more parts available out there anyway. No I start moving and once I get to like 2200rpm it's like hitting a wall or driving around with the ebrake on. I know it's normal for the engine to run on it's cold start map or whatever but this is not normal. It runs really low and rough when cold and has no power at all in any gear until it starts to warm up. It used to start doing it when I hit 3rd gear around 2500rpm but now it does it starting off from 1st and hitting 2200rpm.

**bobbo** · 07-27-2012, 09:19 AM

That sounds like it's going into limp mode. IACV or AACV won't cause that behavior. Have you checked for codes? I strongly suggest going into Maple Leaf Nissan and asking VERY NICELY if they'd hook CONSULT up to your car and getting a scan and print out. Nissan here charged me $100 but they like to treat me like they're servicing an Infinity vs. a Nissan.
It'll tell you what your AACV is doing along with virtually all other functions. Also if they can do it when the car is cold you might be able to get more info as to what is going on.
That all is assuming you're still running the stock ECU.