jay12187

I have been reading up on threads about blocking/bypassing the flow of coolant to the throttle body and IAC valve. My question is this: once I have bypassed the TB and IAC with a long hose, can I completely remove the IAC and accompanying hardlines? I removed the fast idle thermo valve (FITV) on my old Integra with no ill effects and I am wondering if I can do the same here. I can make a block off plate so there isn't a hole in the side of the intake manifold. If anyone could fill me in on anything bad that might happen, that would be extremely helpful.

Thanks,
Jay

mwilly00

I've actually been contemplating on posting a question about this also. I just want to make sure its ok to bypass the IAC as well as the TB.

I think you might get better results by posting this in the Under The Hood section.

Olegator

Do yourself a favor and put it back together...don't fix what's not broken.

jay12187

If that was everyone's attitude, there wouldn't be such an enormous tuning world. You are going to be a busy man if you are going around telling everyone to keep their cars stock.

Anyway, I haven't done anything yet, I just want to know what will happen when I remove the IAC. People bypass it all the time making it useless, but I want to make sure nothing will happen when I remove it completely and block off it's hole.

qbmurderer13

I bypassed mine and loved the results, especially down here in the florida heat. Im pretty sure the IAC valve also has air going through which determines where you idle at, blocking off the coolant line just keeps the temperature down. I might be wrong so hopefully someone with more knowledge can pitch in

Olegator

coolant passage in the throttle body and IAC system are in the car so that the idle at COLD starts can be stabilized, and the throttle body heated faster, that ,in turn, leads to lower emissions and better cold start idle in cold temperatures.
Removing coolant flow through the TB will only deteriorate the off start idle for cold temperatures, nothing else.(it will hit cold start emissions the most)
When the car warms up to the operating temperature the heat from the engine passes on to the intake manifold through convection and conduction, removing the coolant form the TB will not cause any effect due to the fact that the majority of heat comes from the sources stated above and not from the coolant line in the TB.

I can keep on going but i think that should be sufficient...
P.S. I'm not trying to roll on anyone, just stating my opinion

BTW, there would be no difference whatsoever in the car's performance if this "mod" is done in the hot climate because there is no "cold start" problem to start with.