• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

IAC Restrictor Issues

  • Thread starter Thread starter FalconGuy016
  • Start date Start date May 13, 2005
F

FalconGuy016

New Member
Oct 26, 2004
437
1
0
Northern VA
May 13, 2005
#1
  • May 13, 2005
  • #1
Hey everyone,

I read the thread here on stangnet about the IAC restrictors and I wanted to try it out (I've wanted to fix the rev issue from day one )

Well I got it made and was all excited, but only to find that it seemed to do nothing at all. I used alluminum 2/3 as thick as the one used in the thread, but I figured that wouldn't really matter. I also bought engine gasket similar to the IAC gasket and put that between the restrictor and the IAC.

I tried a 7/32 hole first. Did NOTHING! I then tried a hole SMALLER than 5/32 (the "max" restriction) and that did nothing. I can't figure out what im doing wrong. I made sure it was restricting the correct hole as well, but I tried both ways anyways.

I figured maybe a leak could cause this, but can someone please point out anything wrong im doing?

Thanks!
 

Big Steve

Founding Member
Jun 1, 2001
195
0
16
Lower Hudson Valley NY
May 14, 2005
#2
  • May 14, 2005
  • #2
I used a 1/2" copper pipe plug and drilled a 1/4" hole in the middle. Put it in the air hose leading to the IAC. Total cost: 24 cents, time expended: maybe 5 minutes. I needed to let the computer relearn the idle strategy, had some surging for the first minute or so. Why go to all the trouble with the plate when you can get the same results so damn easy, and if you screw it up, another 24 cents for a new plug?
 

mity2

I like Pro3 and all I got was this crappy CT.
Jul 24, 2003
2,872
3
48
StateCollege PA
May 14, 2005
#3
  • May 14, 2005
  • #3
mine is 9/32. seem to work okay
 
You must log in or register to reply here.

Similar threads

S
ECU/PCM ISSUE
  • Santi1015
  • Jun 29, 2026
  • SN95 4.6L Mustang Tech
Replies
2
Views
264
SN95 4.6L Mustang Tech Jun 29, 2026
Santi1015
S
Engine Random Misfire at idle.
  • Gulftown980x
  • Jul 29, 2026
  • SN95 4.6L Mustang Tech
Replies
11
Views
607
SN95 4.6L Mustang Tech Jul 31, 2026
squeak93
J
Engine 4.6 Running rough at half throttle
  • jake411
  • Aug 3, 2026
  • SN95 4.6L Mustang Tech
Replies
5
Views
302
SN95 4.6L Mustang Tech Oct 20, 2026
DangStitches
D
A
Rough idle - cylinder 1 and 6 misfire HELP
  • austindavies935
  • Jul 24, 2025
  • SN95 4.6L Mustang Tech
Replies
12
Views
891
SN95 4.6L Mustang Tech Jul 24, 2025
gkomo
B
Engine Strange Noise
  • burntokita
  • May 8, 2026
  • Fox 5.0 Mustang Tech
Replies
8
Views
546
Fox 5.0 Mustang Tech May 11, 2026
keel
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?