FIAV blockoff?

[CvicKila02]

hey, i have searched everywhere on how to block off a FIAV. i have checked vfaq, http://www.vallotton.com/fiavblockoff.asp , but on there it doesn't show what part to block off i was wondering if i use jbweld what holes to fill up with jb and what to leave open for the ISC motor since they both share that part.

I found this online somewhere its a FIAV blockoff plate now it only has one small hole in it, is that all the ISC motor needs?

This is the Vfaq homemade blockoff plate, i'm wondering why there is so much more open than the other blockoffplate. If anyone could let me know what to fill up that would be awsome. Thanks

 

[Ski Bum]

I installed the JM Fab FIAV blockoff plate that leaves openings for the ISC. It blocks off #2 and 3 in this picture:

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I had to remove the tab held in place by the screw to fit the plate. Not sure what the tab did originally though.

My idle is still a little erratic once the car has been driven for a while but I have a feeling that my ISC has gone out again (havent checked it yet).

 

[2GeNTSi]

Alright, so I'm bringing this back from the dead.

I'm considering purchasing an entire FIAV blockoff. I have the FIAV bypass on my car right now but I'm having high idle issues once the car reaches normal operating temp. I've already looked into the TPS adjustment and have adjusted it many times to spec and also have had my TB rebuilt by John @ Throttlebodys.com.

Upon installing the TB after the rebuilt, I immediately had a VERY high idle +4k right after it fired up. I couldn't figure it out for the longest time so I decided to get the bypass plate. It did solve the initial high idle at start up (on cold starts it takes a few tries to fire up), but once it reaches operating temp the car likes to idle at 2k. It's especially annoying in traffic as the second I push in the clutch the RPMs rise up and stay at 2k.

Now the ISC I have is maybe a little older than a year old (DSMISC.com) and I thought maybe if I unplugged it while I was having the high idle, that it would change a bit. Unfortunately this didn't effect it at all, and I've actually been driving around for a while now without the IAC plugged in with no changes in the idle issue. Also the BISS has been adjusted to almost completely shut, so it cannot be that either.

I'm hoping this will solve the problem, it is getting really annoying.

 

[woooop]

Let it idal and reach proper temp than adjust the idal screw. Back it out alittle other than that you may have a big boost leak and that would make the idal high to in some cases.

 

[FenixTX717]

so can someone post an actual picture of them using jb weld for the part that is blocked off?

 

[PIMking]

this is a quick fix..i made a plate and removed the bottom of the tb.........this is only a temp fix....after a while of driving the coolant wont be there to cool the tb and things will start to warp from heat...so if u do this mod just keep in mind that in the long run it could make things worse.............

what are you talking about?

do you have a torch blowing on your TB while your driving? Because alot of people on here have the bottom of the TB gone and its fine (me being one of them)

 

[Dsmj89]

Just a had a curious question. What exactly is a fiav blockoff good for ?

 

[tunethis]

Just a had a curious question. What exactly is a FIAV blockoff good for ?

A couple things actually. The purpose of the FIAV is the help warm the car on cold starts. It works off of the coolant temperature. When the temp is cold the FIAV lets air past the TB butterfly and that creates a high or "fast" idle. As the temp warms, the idle comes down little by little until it's at normal temp. The adjusting spring inside was set years ago at the factory. Over time, it may lose it position and cause idle problems.

I'm my case, I had a very high idle on cold starts and it was still too high when warm. Blocking the FIAV port will cause your idle stay where you set it. However, in really cold weather, the idle may be too low on start up and the gas will need to be held until the car warms up a little. You may also have to re-set the BISS screw to get the idle where you want it.

Another (questionable -ed) benefit of the FIAV blockoff is the fact that you can remove the coolant lines going to the FIAV. That will bring temps down a little at the TB.

Here's some ways to fix FIAV problems: #1 and #2 are the most common and quickest. This is for FIAV blockoff only and keeping your ISC.

1. Install a blockoff plate designed to fit between the TB and FIAV.
2. Weld or fill the FIAV port on the FIAV with JB weld or Quicksteel.
3. Remove the freeze plug on the FIAV and screw the spring all the way in so it will no longer move on it's own. You can also put a little RTV in the port to insure a 100% seal.
4. Remove the freeze plug on the FIAV and re-adjust the spring tension (This may take a few tries to get it perfect). Do not remove the coolant lines. This is not a blockoff procedure. This is to re-set the FIAV to work as intended.

Instructions on how to do all of these procedures can be found within the forums.

 

[fwd4g63tsi]

How can i block of the fiav on a 90 tb