Blocking off TB FIAV questions?

[TurboRacerGSX]

i need to know if the idle is serioulsy effected or if its not to bad with the throttle body water system blocked off.

 

[talonalex92]

I did the mod that RRE suggested by capping the lines, and driving out the freeze plug to spin in the vavle and left alone. It made it so much easier to idle with my 272 cams. I only had to set it once, and it was done. Only thing that sucks is, if you drive in the winter the car doesnt idle well until it warms up, youll probably have to feather the throttle to keep it going.

 

[Absit]

i need to know if the idle is serioulsy effected or if its not to bad with the throttle body water system blocked off.

Yes, it will seriously screw your idle if you disable the water lines but don't disable/block the FIAV.

 

[9!'clipseDOHC]

Why are you wanting to bypass the FIAV? Is yours not working properly? I have both bypassed the FIAV and blocked off the lower half of the throttle body (FIAV and ISC) and I can tell you that neither idles as well as having a complete working system. My system is now complete again (working FIAV and ISC) and it idles like a dream.

 

[LiquidX]

IMO it won't affect the idle as much as getting rid of the ICS. The FIAV is only utilized to hold a higher idle to warm up the engine faster. At higher coolant temperatures the FIAV is closed in A 100% working system.

By just removing the coolant lines and not closing off the valve it will stay open allowing air to bypass the throttle plate at all times. Also over time the FIAV can work out of adjustment causing idle surge as well.

This will helP shed the light
http://www.dsmtuners.com/forums/articles-intake-exhaust/391977-free-fiav-block.html#post152458783

 

[Boosted98gsx]

By removing the FIAV (blocking off the airflow to the valve) you will have a much rougher startup in colder weather. You will need to feather the throttle to keep the car running until it reaches closed loop operation (ie, the O2 sensor warms up and starts providing feedback). Even then, if can be a bit rough.

 

[LiquidX]

You will need to feather the throttle to keep the car running until it reaches closed loop operation (ie, the O2 sensor warms up and starts providing feedback)

Cant say I've needed to do that even in the cold weather in the north east. The FIAV doesn't close until coolant temperatures reach a certain temperature as the FIAV is a thermostat valve.

Removing the ICS is a different story however as you no longer have a stepper motor to control how much air is needed and instead the BISS is the only way to control airflow past a closed throttle plate.