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How To Remove The Intake Butterfly by Jason Bly

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<font size="6"><strong>Taking Out The Butterfly Valve</strong></font>

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<img src="http://www.newcelica.org/other/installs/butterfly/install.jpg" width="653" height="385">

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<td width="100%">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!!</td>

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<td width="100%">2) Unplug the Mass air sensor wiring

first that is on the top of the air box towards the

intake tube. See diagram.</td>

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<td width="100%">3) Pull the large and small vacuum hoses

off of top of air box to (see diagram).</td>

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<td width="100%">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.)</td>

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<td width="100%">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.</td>

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<td width="100%">6) Release clamps from the top of the

air box that are shown in the diagram.</td>

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<td width="100%">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)</td>

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<td width="100%">8) Take out the air filter. </td>

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<td width="100%">9) Pull off the hose that is attached to

the butterfly valve and plug the end of the hose up!</td>

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<td width="100%">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.</td>

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<td width="100%">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.</td>

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<td width="100%">12) Place Air filter back in air box. </td>

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<td width="100%">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.</td>

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<td width="100%">14) Re-clamp the top of the box, with

the three clamps.</td>

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<td width="100%">15) Reattach large hose and small hose

to air box.</td>

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<td width="100%">16) Slide vacuum sensor with the Hoses

and wiring attached to in back into the original slot.</td>

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<td width="100%">17) Reattach the intake tube to the air

box and refasten hose clamp. </td>

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<td width="100%">18) Reattach the Mass airflow wiring to

the Mass air flow meter. </td>

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<td width="100%"> </td>

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<td width="100%">Note: My self or Newcelica.org are not

responsible for damaged, lost, or misplaced parts, and/or

incorrectly following steps. If you are unfamiliar with

engines or are not mechanically inclined I suggest you

get help from someone with prior experience or better yet

a professional. If you have worked on engines and or

familiar with working on engines then you show have no

problems. This guide is designed to help someone easily

find key areas and parts too aid in the removal of the

"butterfly" valve. If we in anyway can improve

this handy, "printer friendly" guide please

email myself @ <A href="mailto:[email protected]">[email protected]</A> Thanks, and

enjoy!</td>

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<td align="right" width="100%"><strong>Jason Bly</strong></td>

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I just did this on my 00 GTS and man you can really tell a difference - not so much in the first 3 gears, but from 4th on the pull is noticeably better. The engine sounds great (probably due to the greatly less restricted airflow) and the exhaust tone is meaner. Great free mod - takes 30 minutes, and doesnt generate CELs or anything like that. I would imagine a slight gain in MPG as well.
 

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I concur. I loved this mod. I think on an auto its a good mod especially because i get alot better throttle response and less hestitation when pressing the gas. Not for sure about the gains but the sound comes to life right at 3000 rpms in an auto. Nice buttery deep resonating engine purr!
 

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Maybe it just my imagination.....but my imagination is LOVING this mod! Not sure how much faster this translates as far as an ultimate test like a 0-60 time, probably not much at all, but from inside the car, the throttle response seems WAY quicker...obviously sounds better too!

Quick question for those of you who did this a long time ago.....I'm thinking that this butterfly valve is basically an automatic choke....and at engine startup a choke is closed so that you start with a rich mixture...I'm in Southern California, so it probably wont' make a big difference, but how does the car start in a cold climate without the valve?
 

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This is a sweet lil mod. It opens up the intake quite a bit and it was really easy to do, about 20-30 minutes.

I noticed a appreciable power increase and the engine got a bit louder! =)

In response to BlueRice about this valve performing a choke in cold weather... I dont think this device performs that function considering it runs off a vacuum tube, this would mean that it requires pressure to rotate the valve. Considering that at startup engine pressure is lowest, i dont think it would do a very good job of restricting or allowing airflow to provide a more rich mixture. My guess is that this is a noise reduction device...Higher RPMS = more pressure = more sound thus rotate the vavle to sort of baffle the sound as the engine revs more....

but thats just my $0.02
 

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i just did this mod today, and yeah i can hear the difference and it does feel much smoother when shifting
 

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NVM its just cuz the battery was unpluged,
Wow i dont notice a Power difference but definitly in the auto transmisition,
I remember when i would floor it it wouldnt shift for like a few seconds, and now it does it RITE on the nail! worth doing if u have an auto
 

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Does this turn on the Check Engine light due to more air over gas ratio? Anyone have there check engine light turn on since?

Thanks for the info - just want to know of it turns on before foing this Mod.
 

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Check Engine turned on after less than 400 Km's after this mod - Ha#ve to check the code to see if its related; But DAMN does this suck in more air. I love the mod!

Keep you posted on the code that comes out.
 
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