I remembered my old civic, i had the coolant hoses bypassed so that it doesnt go through the iac valve at all. Is there any benefit to doing this? maybe keeping the manifold slightly cooler. Also, does the ecu read from the iac valve. is that what tells the ecu whether or not the engine is cold or not? or is it something else?

I'm thinking if i do this, the iac valve will always be cold and will always be open. Somebody please tell me what you think. thanks

 

n e body?

 

hilo

 

Benefit is to keep the intake air cooler. The coolant lines are there to prevent the throttle body from freezing up. Being in texas you should be fine to bypass. ECU only reads IAC position not temperature at the valve. Water Temp. is read at the coolant temperature sensor.

 

imj talking about the iac valve, the one facing the firewall. What is the purpose of running coolant through there? Does it open the valve when it's cold and close it when its not? but then again, i thought that the ecu controls it?? i already bypassed my tb and IAC valve, but i just need to know. thanks

 

I believe (could be wrong) the one on the back of the manifold facing the firewall is the FITV, fast idle thermo valve. Coolant lines prevent it from freezing.

 

i thought about this but someone also told me that a valve closes once op. tempt is reached, so it doesn't flow anymore ntil the engine gets cold. i think this is what the IAC does

and on G3 tegs the one in the back, next to the TPS sensor is the IAC

the fast idle thermo valve is only on autos and is located below the TB

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cougar10ag &raquo;</TD></TR><TR><TD CLASS="quote">i thought about this but someone also told me that a valve closes once op. tempt is reached, so it doesn't flow anymore ntil the engine gets cold. i think this is what the IAC does

and on G3 tegs the one in the back, next to the TPS sensor is the IAC

the fast idle thermo valve is only on autos and is located below the TB</TD></TR></TABLE>


Dont post wrong information. (i.e. autos only)

Fast Idle Thermo Valve is located underneath the throttlebody and controls idle on cold start ups until the car is reached a certain temp, than the IAC (Intake air control) that is on the back of the manifold takes over and takes over the air control.

As far as bypassing the coolant lines, im not sure, ive been having idle problems eveer since i swapped to a s2k manifold and i could never completly find the culprit.

 

well.. i just bypassed my iac valve. Didnt really make a difference at all, seems to be idling a little better since i did, but could be just my imagination.

with it bypassed, my engine still revs up roughly 300 rpms higher on cold start ups, and goes back to normal idle when the car warms up. I dont have a fast idle valve either.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Swags04 &raquo;</TD></TR><TR><TD CLASS="quote">


Dont post wrong information. (i.e. autos only)

Fast Idle Thermo Valve is located underneath the throttlebody and controls idle on cold start ups until the car is reached a certain temp, than the IAC (Intake air control) that is on the back of the manifold takes over and takes over the air control.

As far as bypassing the coolant lines, im not sure, ive been having idle problems eveer since i swapped to a s2k manifold and i could never completly find the culprit.</TD></TR></TABLE>


funny, my HELMS said it's auto only

 

I know theres an In and out for the IAC .. What if i made a piece that connected the 2 and took it off the Intake mani? I have a Skunk 2 IM and hondata IM gasket. I can tell the IAC is heating up the IM. I think im gonna make an aluminum plate with a waterline groove in it so i can take it off the IM. would there be any reason i shouldnt do this?

 

just keep the IAC valve bolted onto the manifold, and bypass the coolant lines. that way, the coolant wont be heating the manifold, and you wont have any troubles at all, no CEL.

I also noticed when i did this, my car still idels roughly 300 rpms higher when cold and goes down my engine is warm even though my IAC valve is bypassed. So.. no worries there.

i have a hondata gasket also.