IAC Restrictor Gasket Trick Guide
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IAC Restrictor Gasket Trick Guide - 5/11/2007 5:10:15 PM
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Cmpfreak88
Posts: 512
Joined: 1/9/2007
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Rather than putting it at the end of that post I figured I'd put it in a new post so that it gets a little more attention since it's a completely free mod! This was suggested by NeoTokyo and v6stang07 seemed to get the right hole sizes for out v6. All I did was follow what they said and take pics!
Original Thread
Alright, step-by-step for those who can't do it!
Materials Needed:
Felt gasket material ($5/roll at Autozone)
Socket wrench w/ 10mm Socket
Razor
Ruler/Measuring Tape
Fine point pen
About 30 minutes time
Possibly Gloves
Step 1: Park your car open the hood and prop it up. If the car was just running you're probably going to need gloves because the IAC gets a little hot.
Step 2: Take the socket wrench and loosen the two bolts on the IAC module, if you're looking at the car from the front it's on the left side of the upper intake and has one bolt on top and one on bottom. (Shown below) You may not be able to see the second bolt, but it's right underneath the middle of the IAC, fish around for it! And don't drop the bolts! I loosened both bolts with the wrench, then ended up taking off the wrench and just using the socket to take it off because it wouldn't rachet anymore!
Step 3: Pull off the stock gasket and take out the bolts. Set the IAC module on top of the upper intake and take the gasket to the bench.
Note: Your gasket will have much bigger holes, mine already had my modified one on and you can see here that it ripped!
Step 4: Open up your gasket material and cut out a small section about as big as the gasket, if you want, you can trace it out with the pen and then cut it or just lay it on top of the material and then cut around it, I did the latter. Since I was doing this for the second time for the writeup, I saw that my first gasket had ripped, so I recommend cutting out two!
Step 5: Place the stock gasket on top of the new gasket material and trace out the bolt holes, then cut them out.
Step 6: Measure a 5/8" hole on the center of the left side and a 3/16" hole on the center of the right side. Make sure your 5/8" hole is actually going to be all the way open by making sure it fits in the space of the stock gasket. I just drew lines from my center point and made it into a circle. Then cut these holes out. Do this for both gaskets! A razor would probably have been real nice, but I used regular scissors. My holes weren't perfect, but it worked!
Step 7: I left out my stock gasket and then put both of the gaskets on for strength since the last one ripped. Simply place the gaskets on the IAC with the bigger hole on the left side, nearest the fender and the smaller hole nearer the engine. Put the bolts back in and tighten down snug.
Step 8: Make sure all tools are out of the way and go ahead and start the car! Right away you should notice that the rpm's at idle have dropped and it almost sounds like the car is going to stall, but it's just the lower idle speed. Go ahead and rev it up and listen to the new tone! In a 5spd you really notice the difference and will have to shift faster or possibly double clutch it to keep the rpm's up. Nice and easy mod that worked pretty good! Makes my little 6er sound like it has a decent exhaust note! Once you decide you like it, go ahead and make the same thing out of sheet metal and make sure to put gaskets on both sides to keep the seal!
Idle RPM and Exhaust Note Video
< Message edited by Cmpfreak88 -- 5/11/2007 5:13:37 PM >
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SCT XCal2 and 99-04 V6 Exhaust Parts For Sale
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RE: IAC Restrictor Gasket Trick Guide - 5/11/2007 5:24:01 PM
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raz54
Posts: 1758
Joined: 1/12/2007
From: Eureka, Ca.
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Nicely done. I would use thin sheet metal though with 2 gaskets so you wouldn't have the posibility of gasket material getting sucked in to the motor but that's my HO.
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My 04 Mustang is a hybrid, it burns gas and rubber.
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RE: IAC Restrictor Gasket Trick Guide - 5/11/2007 5:43:10 PM
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Cmpfreak88
Posts: 512
Joined: 1/9/2007
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Thanks! This is just temporary until I can get the sheet metal one done. I don't have access to all the tools so I have to get it to my dad so he can do it at his work. I was a little bit concerned about that though... 
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SCT XCal2 and 99-04 V6 Exhaust Parts For Sale
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RE: IAC Restrictor Gasket Trick Guide - 5/11/2007 5:46:44 PM
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NeoTokyo
Posts: 2533
Joined: 12/2/2003
From: Sacramento, CA
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Very nice write up, hope it goes sticky :)
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95' Mustang Mach 1 281 manual - Penny -
Slightly Modded 4.6L / 5.3L ModStroker
RAM King Cobra Super Duty Clutch
White Ext. Charcoal Mach 1 Int.
Mach1 Shaker, badging/Clone
18"x10.5" Y2K Cobra R's
96' Mustang 00' Swap - NoName -
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RE: IAC Restrictor Gasket Trick Guide - 5/11/2007 6:33:00 PM
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232_01mustang
Posts: 412
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quote:
ORIGINAL: NeoTokyo
Very nice write up, hope it goes sticky :)
agreed...very thorough and precise writeup! it deserves a sticky!!
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2001 Mineral Grey Mustang
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RE: IAC Restrictor Gasket Trick Guide - 5/12/2007 5:27:52 PM
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crysalis_01
Posts: 246
Joined: 8/5/2006
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Possibly a stupid question: All of those who I've seen doing this are splitports, will I get similar results out of a singleport (i.e. the exhaust note change)
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'96 Mustang-3.8L V6
ASP UDP----CAI
MPP 4.10's--FRPP T-lok
TG Shift Kit
'98 Mustang-3.8L V6
'00 p&p Splitport swap
'95 Mustang-3.8L V6 (vert)
stock
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RE: IAC Restrictor Gasket Trick Guide - 5/12/2007 6:41:43 PM
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NeoTokyo
Posts: 2533
Joined: 12/2/2003
From: Sacramento, CA
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It should work, you will just have to try it out.
Thats what we did.
I started a thread a while back about the use of the Mach1 restrictor plate mod and a few people started trying it. It took a couple tries but it worked out. The first hole was cut out to the specs of the Mach1 adapter but was soon found out that 3/16 was much more affective than 5/16.
_____________________________
95' Mustang Mach 1 281 manual - Penny -
Slightly Modded 4.6L / 5.3L ModStroker
RAM King Cobra Super Duty Clutch
White Ext. Charcoal Mach 1 Int.
Mach1 Shaker, badging/Clone
18"x10.5" Y2K Cobra R's
96' Mustang 00' Swap - NoName -
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RE: IAC Restrictor Gasket Trick Guide - 5/12/2007 7:26:04 PM
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crysalis_01
Posts: 246
Joined: 8/5/2006
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Guess I'll give it a shot tomarrow. I'll respond if it has affect good or bad.
_____________________________
'96 Mustang-3.8L V6
ASP UDP----CAI
MPP 4.10's--FRPP T-lok
TG Shift Kit
'98 Mustang-3.8L V6
'00 p&p Splitport swap
'95 Mustang-3.8L V6 (vert)
stock
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RE: IAC Restrictor Gasket Trick Guide - 5/12/2007 7:50:59 PM
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NeoTokyo
Posts: 2533
Joined: 12/2/2003
From: Sacramento, CA
Status: offline
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Let the car cool, the IAC is pretty hot, otherwise you might need this.
_____________________________
95' Mustang Mach 1 281 manual - Penny -
Slightly Modded 4.6L / 5.3L ModStroker
RAM King Cobra Super Duty Clutch
White Ext. Charcoal Mach 1 Int.
Mach1 Shaker, badging/Clone
18"x10.5" Y2K Cobra R's
96' Mustang 00' Swap - NoName -
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RE: IAC Restrictor Gasket Trick Guide - 5/13/2007 6:30:05 PM
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v6stang07
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^^^ that is very tru, i actually did it hot but i used gloves, great write-up i got carried away like i always do with my car and forgot about it
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RE: IAC Restrictor Gasket Trick Guide - 5/13/2007 10:16:54 PM
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Cmpfreak88
Posts: 512
Joined: 1/9/2007
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quote:
ORIGINAL: cisurfer
damn that stock exhuast sounds good.....whatever happened to my write up dont i get a sticky haha
 Thanks! Haha, I've been cruising around with my windows down lately just to hear the exhaust at stoplights, I love it! Can't wait to do my duals now...
Yeah, first time through I had my camera out and all, but I was too busy trying to remember which hole went on which side, haha. Second time through I made sure to take pics! And I just used gloves and it worked fine. But then again I'm pretty hardcore, what can I say, haha. I'm interested to see if the single ports get the same performance. Everyone should do this, great mod for practically free!
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SCT XCal2 and 99-04 V6 Exhaust Parts For Sale
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