Throttle body coolant hose bypass?, anyone done this? Options

[blu94gt]

So I was talking with a friend at work about cars, and we were talking about pulling my throttle body to clean it since I've had some issues lately, but he said while I have it off I should leave the coolant hoses that go to it disconnected and that will help reduce intake air temperature.

Any gains from doing this? Only thing I can find online is that it will cause problems during the winter, but even those reviews seem to be mixed.

[pittfirefighter]

what coolant lines?

[Johnnyny]

So I was talking with a friend at work about cars, and we were talking about pulling my throttle body to clean it since I've had some issues lately, but he said while I have it off I should leave the coolant hoses that go to it disconnected and that will help reduce intake air temperature.

Any gains from doing this? Only thing I can find online is that it will cause problems during the winter, but even those reviews seem to be mixed.

i know spider77 just did this im sure you will see gains but probably nothing too crazy

[stephen_lee]

if you have cold winters and high humidity, you might freeze your throttle open/closed. you're basically "decompressing" or reducing the pressure of the air as it passes into your intake... which causes quite a decrease in temp. if at all possible, put a valve on one of the coolant lines(or both), so you can open it and have functionality of the throttle defrost as Toyota intended if you ever have the 'frosting' issue.

[Cuts_the_Pilot]

i disconnected mine way way back when.

whats the lowest temp you get where you are (ie freezing)

the idea of it is to heat up a little wax pallet, this opens a valve and lets air into your engine so it idles cold. If your not in an overly cold climate then its not such an issue.

[stephen_lee]

im going to completely remove this system from my V6 swap as i live in south tx and it doesnt get cold here lol. cut the nipples and weld the holes closed.. may even put in an electric heater and do away with the heater core and the associated lines... we'll see

that idea was replaced with the IAC valve, an electronic control the does the same function

i disconnected mine way way back when.

whats the lowest temp you get where you are (ie freezing)

the idea of it is to heat up a little wax pallet, this opens a valve and lets air into your engine so it idles cold. If your not in an overly cold climate then its not such an issue.

[Spider77]

I just did this with my 5S last weekend. All I did was purchase two hose clamps (almost typed "clams"), and a 5/16 barbed brass connector. Took off the coolant lines, threw the hose clamps on either (by that I mean both) side, inserted barb connector, and tightened hose clamps. You could use a 3/8 connector, but I found it to be a bit too tight (as I couldn't get the hose flush). Now you could hook up valves and what not, but it only takes about 10 min to swap it back and forth, so whats the need? Unless your that lazy I suppose.
But really it isn't that hard to do. And when the weather here starts getting rough I'll just put it all back together and wait till it warms up enough.

[blu94gt]

Thanks for the input guys. I think I'll at least give it a try since it's been so hot here lately.

Winters here get pretty cold, every now and then we dip into the single digits, but the air is usually very dry (I get a lot of static shocks on things all over the place). I've read about some people having issues, and other people going for years driving in the snow with the lines bypassed. Most likely I'll put a valve in the line to make it easy to switch.

[Batman722]

I've had mine bypassed on my 3s for a few years now.
No problems in any weather.

[Spider77]

See, it must be one of things that everyone does, but no one talks about......

[HectortheRican]

See, it must be one of things that everyone does, but no one talks about......

Could you explain to me what this does, other than make the motor idle cooler?

[stephen_lee]

lowers intake temp slightly. lower temp = denser air = more power. you gain a tiny amount of power (<1hp)

[Smaay]

it doesnt do anything. it removes the slight possibility of having warmer air from hot water flowing through it entering the engine. its purpose os to prevent the TB from freezing up in extreme cold. bypassing the TB just cleans things up a little

[HectortheRican]

Soo... how does it get bypassed?

[SleekCelica]

Connect the two hoses directly to each other using a coupler, and 2 hose clamps, rather than connecting them to the TB.

[stephen_lee]

or just cap them off at the water neck

[HectortheRican]

I see. I guess if I decide to mess with it, I can ask Spider77. He's pretty close to me

[Spider77]

Yea he is, its real simple man.

[blu94gt]

Working on capping them right now. Have the TB off the car, just finished cleaning it up, it was a MESS, I'd seen dirty TB's before but this was a really thick, chunky build up of stuff. No wonder I was having throttle sticking problems. Looks like I might make myself an oil catch can and someday clean my whole intake manifold too.

Should get it finished up pretty quick after I sit in the air conditioning for a bit, it's HOT out in the garage!

[f1yen]

I had mine bypassed; untill i had to engine swap
double male barb and 2 hose clamps

Celi made it though like 2 winters here in WI, sub zero quite a bit; I wouldn't worry about it too much.

[4-eyed-freek]

can i get a pic here i wanna know what your all talking about lol.

[millow]

just like to add in how about the inlets in the TB seal them to or leave them as is

[Spider77]

I capped mine.

[HectortheRican]

I capped mine.

Hey Spider, I dunno how many the 5S has, but on my 7A, there's 2 pairs of hoses on the TB. You make it sound like there's only one on yours.

[Spider77]

Um, there are 3 on mine. one for vac and other two for coolant

[HectortheRican]

Um, there are 3 on mine. one for vac and other two for coolant

Weird.. well which one needs to be bypassed?

[Spider77]

the two coolant hoses need to be connected.

[blu94gt]

Instead of connecting the two hoses, I just removed the shorter one (the one that comes from the upper radiator hose) and connected the other hose to where it came from. No need to buy a connector.

And I definitely notice a difference on these hot days, but I'm assuming some of that gain is also from cleaning my throttle body.