Jump to content
The mkiv Supra Owners Club

Idle Air Control Valve (IACV) Options on Aftermarket Manifold


mwilkinson

Recommended Posts

I have a replica Greddy manifold. I have been going over some of the install processes today and got to the Idle Control Valve.

 

This kit has the same remote location kit for the IACV as the Greddy one. Unfortunately the diameter of the new fitting is slightly to small for the parts of the IACV to fit.

 

Now,the fitment issue could be because it's a cheap kit and they have just got this wrong. I have emailed the company to see if they can help.

 

I have also been reading up to see if there was a difference in the IACV size between auto and manual, which there does not appear to be. Also a pre and facelift car, which apparently there is.

 

I have also been reading that many aftermarket manifolds don't come with a IACV relocation kit.

 

I have a Syvecs ECU going in and wondered if there was a way of controlling idle without the valve or if there was another option to control the idle which other people with aftermarket manifold, other than the Greddy one use?

 

Any help would be gratefully received.

Edited by mwilkinson (see edit history)
Link to comment
Share on other sites

I was looking at this more after posting this last night.

 

The issue is not so much the idle control valve itself, but the check valve and washer, which are only on the TT models (i think).

 

See in this diagram what I mean IACV Diagrams

 

I intend on doing as Simon B did on his car but as above the fitment of the part for the IACV on the remote location bracket is poor. (See post 148 on link below).

 

Simon B's build thread post number 148

 

My options, in my opinion, are to source a replacement part for the IACV relocation kit as part of my throttle body to use the stock IACV, or see if it is possible to use a different IACV from another car or a generic one given that I will be running this from the Syvecs and not the stock ECU with a piggy back. There are plenty of more modern IACVs out there but I am unsure if they would be suitable. Using an aftermarket one would reduce the size and remove the need to have such a large assembly, most of which from the TT is the coolant assembly which I wont be using.

 

I think I will give Ryan a shout on this to se what he think the Syvecs can handle.

Edited by mwilkinson (see edit history)
Link to comment
Share on other sites

OK, I seem to be documenting my own thoughts but I think this will be useful to someone in the future LOL.

 

I have had other look at the kit that is supplied with the manifold.

 

As stated earlier the issue is the fact that the washer and check valve are only very slightly larger than the opening which has been made for them. Thus I would need to have this enlarged, or reduce the size of the valve and washer to make them fit.

 

I have however, come up with another plan. I noticed that the adaptor separates into two parts and that the opening between the two parts is the same size as the check valve. Therefore, an option would be to place the check valve here, with two washers to form a seal, and se how that works.

 

IMG_0884.jpg IMG_0885.jpg IMG_0886.jpg IMG_0887.jpg IMG_0888.jpg

 

This would omit the washer, but I think that was only there to form a seal and extend the check valve into the throttle body.

 

Any thoughts on this?

Edited by mwilkinson (see edit history)
Link to comment
Share on other sites

  • 7 months later...
OK, I seem to be documenting my own thoughts but I think this will be useful to someone in the future LOL.

 

I have had other look at the kit that is supplied with the manifold.

 

As stated earlier the issue is the fact that the washer and check valve are only very slightly larger than the opening which has been made for them. Thus I would need to have this enlarged, or reduce the size of the valve and washer to make them fit.

 

I have however, come up with another plan. I noticed that the adaptor separates into two parts and that the opening between the two parts is the same size as the check valve. Therefore, an option would be to place the check valve here, with two washers to form a seal, and se how that works.

 

[ATTACH=CONFIG]145720[/ATTACH] [ATTACH=CONFIG]145721[/ATTACH] [ATTACH=CONFIG]145722[/ATTACH] [ATTACH=CONFIG]145723[/ATTACH] [ATTACH=CONFIG]145724[/ATTACH]

 

This would omit the washer, but I think that was only there to form a seal and extend the check valve into the throttle body.

 

Any thoughts on this?

 

 

What did you do to resolve this in the end ?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.