2G FIAV disable

[bjmauck]

What are the disadvantages in disabling the fiav? I figure disabling it and not running the coolant will help for a cooler intake charge. Will the 1g fiav valve and iac valve fit on a
t body?

 

[007jimmy]

The only disadvantage of deleting the FIAV is that on cold starts you might have to feather the gas pedal until the car catches idle. It doesn't take long and is usually not a problem for most people that have done this mod. The 1g and 2g FIAVs are interchangeable, the only difference is the way the coolant inlet/outlets are facing. As for the ISC use the black one because they don't tend to fail like the tan colored ones although both will work and fit. If you are looking for a cooler intake you should look into a intake manifold heat barrier gasket (phenolic gasket). I highly doubt that the air is staying in your throttle body long enough to heat it up even at stock boost levels. I have decided to keep my FIAV as the weather up north here gets kinda cold in the winter months. No ill-effects and no idle issues at all. Hope this helps...

 

[bjmauck]

Thanks for the info. i live in Ga so i dont see much cold weather.

 

[BigTyla]

There's really no good reason to delete the FIAV. You'll have to babysit the car for a couple of minutes while it warms up which I think is less than optimal. It won't decrease your intake temperatures by deleting it. TBH an FIAV delete is a waste of time.

 

[007jimmy]

There's really no good reason to delete the FIAV. You'll have to babysit the car for a couple of minutes while it warms up which I think is less than optimal. It won't decrease your intake temperatures by deleting it. TBH an FIAV delete is a waste of time.

^^ This... Unless you have idle issues its not worth the hassle...

 

[BigTyla]

^^ This... Unless you have idle issues its not worth the hassle...

I would say it's not worth the hassle even if you DO have idle issues. It's a bandaid fix at best. Find the real problem, don't mask it.

 

[livedsm4g63]

I would say it's not worth the hassle even if you DO have idle issues. It's a bandaid fix at best. Find the real problem, don't mask it.

How is that masking the problem when you are deleting the problem?

I plan on doing one soon to my car. But I will be keeping my isc.

 

[BigTyla]

How is that masking the problem when you are deleting the problem?

I plan on doing one soon to my car. But I will be keeping my isc.

If that's really the problem and you can deal with the cold idle issues, more power to you. Unfortunately, many people misdiagnose FIAV issues, throw on some cheap block-off plate, and their problems persist. So now they have the same idle issue AND they have to babysit their car during cold idle.

Case in point: my Talon is the first DSM I've owned and you wouldn't believe how many things were done to this car to fix a "bad idle" issue. PO blocked off the FIAV, replaced the 1G throttle body with a 2G (!), did a vac reduction, and even more ridiculous things in a effort to "fix" a problem. His actual problem? His MAF was hacked. I replaced it with a proper unhacked MAF and the problem was solved.

All these "quick fix" solutions cause a cascading effect as many of them simply introduce more problems, making the actual problem harder to diagnose. This leads to frustration and the owner eventually selling his car. Of course, people like me benefit from this behavior as we get perfectly good cars for cheap prices, so who am I to complain?

 

[007jimmy]

I would say it's not worth the hassle even if you DO have idle issues. It's a bandaid fix at best. Find the real problem, don't mask it.

I understand but there has been some known issues involving the FIAV such as coolant leaking into the intake manifold (rare) and a coolant system that is not maintained properly causing a sludge-like build up on the spring and valve not letting it seal properly. If it doesn't seal right obviously more air would bypass the TB resulting in surge or high idle. Livedsm4g63, there is a free way to seal up the FIAV without buying one of those block-off plates. Just pop out the freeze plug on the TB and screw the valve closed. There is a tech article on how to do this for those who didn't know. Definitely keep the ISC though.

 

[livedsm4g63]

I understand but there has been some known issues involving the FIAV such as coolant leaking into the intake manifold (rare) and a coolant system that is not maintained properly causing a sludge-like build up on the spring and valve not letting it seal properly. If it doesn't seal right obviously more air would bypass the TB resulting in surge or high idle. Livedsm4g63, there is a free way to seal up the FIAV without buying one of those block-off plates. Just pop out the freeze plug on the TB and screw the valve closed. There is a tech article on how to do this for those who didn't know. Definitely keep the ISC though.

I know but thank you for pointing that out to the rest.