Air Intake Tube Question - Toyota Nation Forum : Toyota Car and Truck Forums

JetspeedCamry · 01-04-2005, 02:28 AM

There is a hose that comes off the air intake tube and goes to somepart on the rear of the manifold. What is it? And is it neccessary?

My intake tube is starting to crack and needs replacing. I have some 5" flexi pipe that I can use, but i'm not too keen on cutting a hole and putting a fitting on it.

Thankyou.

karugs · 01-04-2005, 02:51 AM

What is inside those hoses? Looks like some sort of fluid. It could be the heater hose

MadDawg · 01-04-2005, 02:54 AM

post a zoomed out picture, i have no idea what i'm looking at.

JetspeedCamry · 01-04-2005, 03:09 AM

That BIG round hole you see is the manifold. It's where the intake tube connects to. That smaller tube i circled connects to the intake tube.

white90dx · 01-04-2005, 03:09 AM

What year and what motor?

And yes, if its there, you probably need it.

-Charlie

JetspeedCamry · 01-04-2005, 03:11 AM

1988 V6 2vz-fe

Toysrme · 01-04-2005, 04:04 AM

It's the air bypass line. (IAC line)

When your throttle plate snaps shut, obviously air has no way of entering the engine.

Air bypasses the throttlebody and goes in the upper intake from that hose. Which, actually has an electronic gaget that acts like another throttle body, and controls the idle mixture and what not. Which is the IAC valve.

karugs · 01-04-2005, 04:07 AM

By any chance, could this cause hot/warm engine starting problems? (the IAC valve)

Toysrme · 01-04-2005, 04:18 AM

It can. You can test the resistance to check it's function, and if you're not afraid of spilling the fuel that routes to it you can take it out and clean it too.

It will be black caked with exhaust, and gold colored from the oil/fuel baked on it when it should be silver. Like this:

That is the cold start injector on a 3vz-fe v6, but that is for demonstration purposes only. LoL!

Start a thread for your idle problem and we'll help you with it!

karugs · 01-04-2005, 04:27 AM

Toysrme,

I'm only helping out somebody who has already posted his problem:

http://www.toyotanation.com/forum/t60965.html

Maybe you could shed some light to the three people who have that problem in that forum.

JetspeedCamry · 01-04-2005, 04:38 AM

Well..back to my original question...is it required? What happens if i dnt connect it, or take the hose out and block it off?

terrastrife · 01-04-2005, 05:46 AM

if you block it then obiously as stated b4 the engine cant breathe if ya throttle isnt open.. so like.. its kinda required...

mcelligott · 01-04-2005, 11:04 AM

Yea, your car will just stutter then stall when you start it unless youre giving it gas ALL the time, lol.

Toysrme · 01-04-2005, 01:57 PM

Sorry karugs, I don't do toyota i4's hah!

But seriously, the only experiance I have with those motors is the '93 corolla I had years back, and it always ran like a jewel. Even after being totaled.

karugs · 01-04-2005, 02:14 PM

No need to apologize. At least I pointed them to a possible culprit. That's the dealer's job to fix their own car.

EDIT: I actually read about it too once but it was a different make so I figured it might not be the same. But seeing that it could be, I linked the two posts in hopes that something can be done.