4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

How To: IAC Rev Mod (Fixing the hanging RPMs)

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Old Feb 16, 2009 | 05:31 PM
  #21  
devore86's Avatar
devore86
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Does this have the same effect on an auto?
Old Feb 18, 2009 | 12:31 PM
  #22  
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Originally Posted by defconfire
I am curious about the A/F at idle too.
it won't be affected at all, Idle is all closed loop operation. If needed the computer will add or remove fuel.
Old Feb 21, 2009 | 07:24 PM
  #23  
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i did this trick and the rpms dropped down to about 1500 2000 rpms and hung there for a bit. and when the car is warm the car idles at about 900 1000 rpms. think it could be a bad tps?
Old Feb 22, 2009 | 11:38 AM
  #24  
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Anybody got any pics of this install?
Old Feb 22, 2009 | 12:15 PM
  #25  
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I look mine out a couple days ago after a month. I was tired of the horrible noise it made out of my exhaust and my car stalling and turning off randomly.
Old Feb 22, 2009 | 12:38 PM
  #26  
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Originally Posted by CoolAid
- Makes the exhaust have the "gargle and pop" sound like an old hot rod when its on the down scale of a rev.
In my experience this condition has always been the result of an exhaust leak, and the faster an engine with a leak deccelerates the more it will "gargle and pop".

Other than that this is an excellent write up i will definitely be trying this mod on mine. Thanks
Old Feb 22, 2009 | 02:46 PM
  #27  
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Originally Posted by TX97GT
Is this only for a 99-04?
no go on the 96-98 4.6's?
Old Sep 18, 2009 | 12:18 PM
  #28  
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It works great. Just did my 97 GT and now it idles down like it should.
Old Sep 18, 2009 | 01:35 PM
  #29  
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Originally Posted by Thumper2Kewl
In my experience this condition has always been the result of an exhaust leak, and the faster an engine with a leak deccelerates the more it will "gargle and pop".

Other than that this is an excellent write up i will definitely be trying this mod on mine. Thanks
A lot of exhaust system that are straight through mufflers and no cats "gargle & pop". No back pressure usually causes the gargle & pop sound.
Old Sep 18, 2009 | 03:35 PM
  #30  
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January of 07...nice.



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