I have been thinking of deleting this on the intake throttle body on the 1JZ. Is this a good or bad thing, pro's and con's? I have heard it is a good thing due to the eliminating the possiblity of losing boost through this device. I just want to confirm this or leave it in place and keep the filter clean and an eye on the hoses leading to and from?

 

How will your engine idle without it?

 

That's what I said exactly too. Mu buddy who come over awhile back stated possibly to remove for the reasons above. I wanted to further the discussion more by asking.

 

i haven't heard about losing boost through an IACV but it is possible. I think i remember seeing a member on Supramania deleting it by capping off the IACV port on his intake manifold, then cracking open the throttle using the idle speed screws on the throttlebody to create a controlled vacuum leak through his throttle. The only issue i can think of is the 1JZ ecu will freak out not being able to control idle air like it normally does.

Another option is to find a brand new IACV....seriously. It cost me a bit but toyota actually had one stocked in california when i needed one a year ago. Don't need to worry about it ever again

 

I cleaned mine out very good with carb cleaner. This was the springs and small aluminum piece. Now if I could only figure out how it goes back together. I will definitely order a need air filter, it's black.. I will keep it for now unless someone says a different story.

 

http://planetsoarer.com/IAC/iac.htm

I don't remember if the 1JZ valve is similar construction but maybe it will be of use.

 

Sadly its not. I remember comparing the 1JZ and my old 2JZ IACV (the 2JZ IACV is similar to the 1UZ one pictured). The 2JZ unit can be dissasembled to an extent, the 1JZ one is a sealed unit and servicing it is difficult.

 

I bumped this old thread of mine to see if anyone has taking their IACV out and inspected it or replaced? I need to be certain the only thing inside this from the intake manifold is the filter and NO small springs or a metal pin?

 

i just now noticed this thread!!!!

mark, if i were you, i'd 100% keep the IACV without a doubt.

 

But why?

He is not on stock ecu.

 

bumppers!!! I have pretty much the same setup as mark and now iam asking the same(should I keep it) question?

 

Jim if I were you... I would keep the IACV .

 

iam thinking about it. thing is it won't stop hissing when I close the throttle plate?

 

That means it is doing its job. There are pros and cons in keeping that IACV.

IF you have a well tuned aftermarket ECU , you can take it out. In high HP applications, at times they leak that is one reason they take it out. It is all really in how things are setup .....

It's main job is to regulate air during idling especially during startup . The the hissing noise can be regulated by routing the air back to the pipe before the turbo. I am sure you have a small filter now that is why you hear that hissing sound. Try replacing the kind of small air filter you have there that can muffle the sound.