I understand they must be there for some type of reason. However I don see why. If the IAVC needs a ECT reading why doesnt it just go off the ECT sensor in the head ? Or is it just for startup on a cold engine kind of like the coolant lines to the FITV ? What would be the compromise made if i didnt run those coolant lines to the IACV ?

 

Those lines are there just so the IACV doesn't freeze in the cold.

 

Yep, you can remove the coolant lines from the IACV without any problem.

 

oook so its the same idea as the FITV thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lude98SH &raquo;</TD></TR><TR><TD CLASS="quote">oook so its the same idea as the FITV thanks. </TD></TR></TABLE>

uhh no man, the FITV uses a thermostat to raise the idle when the coolant is cold.

 

no im saying the coolant lines are used for the same reason on both, to prevent freezing

 

and I'm telling you that you're wrong. the coolant lines to the FITV are what control the amount the idle is raised. they're the reason that valve is there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lude98SH &raquo;</TD></TR><TR><TD CLASS="quote">no im saying the coolant lines are used for the same reason on both, to prevent freezing </TD></TR></TABLE>

Yeah, like Matt said, the coolant lines on the FITV are used to activate the thermal wax inside and open/close the plunger to control the idle. Taking the lines away from the FITV will make the idle low at startup...

 

Hawkze

I beleive that if you just removed the coolant lines from the fitv then the idle would actually be higner rpm. Since the heat from the engine coolant actually closes the plunger when you remove that heat it never closes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SikB &raquo;</TD></TR><TR><TD CLASS="quote">Hawkze

I beleive that if you just removed the coolant lines from the fitv then the idle would actually be higner rpm. Since the heat from the engine coolant actually closes the plunger when you remove that heat it never closes. </TD></TR></TABLE>

As I understand it, FITV = Fast Idle Thermo Valve, meaning it causes the engine to idle 'faster' or 'higher' while the engine is cold to bring it up to operating temp quicker. Most cars that I have seen will idle high while cold except for my Prelude which does not have a FITV....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">and I'm telling you that you're wrong. the coolant lines to the FITV are what control the amount the idle is raised. they're the reason that valve is there.</TD></TR></TABLE>

Makes sense.... i guess the coolant that is routed through the FITV also warms the butterfly plate to prevent freezing ? As well as what you said ?

 

sorry for intruding in your post but what benefits do you gain from this? and the fitv is the one infront of the manifold right? and the iacv is the one under the t/b? if you take off (reroute) the cooling hoses going to the t/b how will that affect the engine?(car)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by royalfelix &raquo;</TD></TR><TR><TD CLASS="quote">the fitv is the one infront of the manifold right? and the iacv is the one under the t/b? (car)</TD></TR></TABLE>

other way around ... IACV is near your fuel rail on the IM, FITV is under your TB.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by royalfelix &raquo;</TD></TR><TR><TD CLASS="quote">sorry for intruding in your post but what benefits do you gain from this? and the fitv is the one infront of the manifold right? and the iacv is the one under the t/b? if you take off (reroute) the cooling hoses going to the t/b how will that affect the engine?(car)</TD></TR></TABLE>

you have them backwards.

removing the coolant lines from the IACV will do next to nothing for performance, and removing them from the FITV and leaving it is just a horrible idea. SikB is right, if you leave that thing cold it is going to stay open and let a bunch of air in.

You can remove the FITV altogether by just putting a blank piece of gasket paper in between it and the TB, then you will lower the temp of the throttle body some, again this is going to net you next to nothing for power and warming your car up when its cold will suck, you'll have to sit there w/your foot on the gas the whole time.

 

isnt letting more air in a good thing?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by royalfelix &raquo;</TD></TR><TR><TD CLASS="quote">isnt letting more air in a good thing?</TD></TR></TABLE>

nope.