Celica Forums » Customization How-To Guides » ENGINE PERFORMANCE How-To Guides » Intake Butterfly - How To Remove

Taking Out The Butterfly Valve



1) Ok first thing you need to do when taking out the butterfly valve is to unhook the negative battery terminal. I like to wrap something around the cable so it can't make contact with any metal by mistake!!

2) Unplug the Mass air sensor wiring first that is on the top of the air box towards the Intake tube. See diagram.

3) Pull the large and small vacuum hoses off of top of air box to (see diagram).

4) Slide sensor off of air box that has two vacuum hoses and wiring attached to it. See diagram. (the two hoses and wire can be taken off to leave sensor attached to top section of the airbox also.)

5) Loosen the clamp that is around the Intake hose and attaches to the air box. (Phillips screwdriver) push the Intake tube towards the back of the car to slide tube off.

6) Release clamps from the top of the air box that are shown in the diagram.

7) You should now be able to lift the top of the air box by gently working it off towards the back of the car. (there are groves on the front that it rest in)

8) Take out the air filter.

9) Pull off the hose that is attached to the butterfly valve and plug the end of the hose up!

10) Slide the Butterfly valve straight up. It has two clips on the bottom (can be reached by hand under bottom of Intake) that need moved slightly to allow the butterfly to come loose.

11) Place the butterfly hose back in the same slot that it came out of. As to not interfere with other moving parts of the motor.

12) Place Air filter back in air box.

13) Place top half of air box in proper position. Make sure no wires, hoses, or clamps are stuck in between top and bottom halves. This may take a few moments to slide air box in proper location. Makes sure it is sitting in slots towards the front of the air box before going further.

14) Re-clamp the top of the box, with the three clamps.

15) Reattach large hose and small hose to air box.

16) Slide vacuum sensor with the Hoses and wiring attached to in back into the original slot.

17) Reattach the Intake tube to the air box and refasten hose clamp.

18) Reattach the Mass airflow wiring to the Mass air flow meter.

is there a hp increase by taking this out? and is there a dissadvantage when taking this out?

The "butterfly” is a plastic part located inside the air box that is recognizable by the small white flap in the middle. This is a very minor modification which has not shown any significant power gains but results in a deeper sound when accelerating it was placed there by Toyota to help MPG by reducing the amount of air that enters the engine & to keep the car a little quieter at RPMs below 3500.

Positives: Deeper Sound, Little Bit Better Acceleration
Negatives: Possible Harder To Start Car

Some Dyno Runs...

does the gt also have it....and do you take it out hte same

the location is the same on both the GT and the GT-S

thanks

will i get less mpg?
how big of a change?
about how long does it take?

thanks for the help

You shouldn't get any less mpg but you should get atleast a 2hp or a lil more gain because your engine will be getting more air with less restriction The process took me only 5-10 minutes if that.

I removed mine last night.Took me about an hour(I took my time and cleaned the filter box).The only problem I had was takeing out the butterfly valve peice and one of the clips broke,but it won't hurt anything.Thanks for the guide