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

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Old 02-16-2009, 05:31 PM   #21
devore86
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Does this have the same effect on an auto?
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Old 02-18-2009, 12:31 PM   #22
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Quote:
Originally Posted by defconfire View Post
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.
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Old 02-21-2009, 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?
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Old 02-22-2009, 11:38 AM   #24
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Anybody got any pics of this install?
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Old 02-22-2009, 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.
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Old 02-22-2009, 12:38 PM   #26
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Quote:
Originally Posted by CoolAid View Post
- 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
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Old 02-22-2009, 02:46 PM   #27
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Quote:
Originally Posted by TX97GT View Post
Is this only for a 99-04?
no go on the 96-98 4.6's?
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Old 09-18-2009, 12:18 PM   #28
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It works great. Just did my 97 GT and now it idles down like it should.
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Old 09-18-2009, 01:35 PM   #29
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Quote:
Originally Posted by Thumper2Kewl View Post
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.
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Old 09-18-2009, 03:35 PM   #30
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January of 07...nice.
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Old 09-18-2009, 04:20 PM   #31
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Well, it looks like it has been re-rezzed many times b/t then and now, first time I have heard of it...
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Old 12-14-2009, 09:23 PM   #32
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i tried this and it worked amazingly, i was really annoyed by the hanging idle, and this fixed it completely. mine wouldn't idle at all with the 3/16 hole, so i bumped it up quite a bit and it worked great. it was $5 for a whole roll of gasket material at the local auto zone so i just cut out the shape from one of the oil quarts i used this morning. great tip
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Old 12-16-2009, 04:22 PM   #33
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Quote:
Originally Posted by shwert View Post
i tried this and it worked amazingly, i was really annoyed by the hanging idle, and this fixed it completely. mine wouldn't idle at all with the 3/16 hole, so i bumped it up quite a bit and it worked great. it was $5 for a whole roll of gasket material at the local auto zone so i just cut out the shape from one of the oil quarts i used this morning. great tip
Ordered the kit off eBay for $10. The guy has 100% fb, so I will give it a shot. I had to unstick my IAC about a year ago, since it just died randomly on me, cleaned it out and hasn't done it since! I hope this fixes the hanging idle on mine, I look forward to smoother shifts.
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Old 02-08-2010, 06:43 PM   #34
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i bought a metal one on ebay for 10 shipped
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Old 07-31-2010, 03:19 PM   #35
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Awesome mod...finally got around to doing this myself. I ended with at 1/4" hole, $6 investment, and 10 minutes less of my time INCLUDING taking it on a test drive. Best part is that it's completely reversible.
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Old 07-31-2010, 05:22 PM   #36
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the question still looms....

will this harm the engine in anyway?
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Old 07-31-2010, 09:00 PM   #37
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.....No
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Old 07-31-2010, 09:53 PM   #38
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Or you can go to Home Depot and buy a 1/2" copper pipe cap, drill a hole in it (start at 1/4") and stick it into the IAC feed tube--83˘ and no tools needed to swap it out...

Click the image to open in full size.

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Old 08-02-2010, 11:46 AM   #39
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very nice, Cliffy. As Usual. Will have to do this, I like the idea better.

OT, but I really like how you painted your TC and Plenum. I have the same ones, and might just have to follow suit and do that to mine. Either Black or yellow, not quite sure. Any tips?
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Last edited by sweger; 08-02-2010 at 11:50 AM.
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Old 10-15-2010, 03:41 PM   #40
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wtg coolaid worked like a charm...ingenious fix..couldnt stand the hanging rpm's just because of a smog thing..now when I back down I dont just coast I actually slow down, and the sound is better when I give it a short rev like the old hot rods...love it
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Old 10-15-2010, 03:41 PM
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50, cleaning, directions, gargle, gt, hang, hanging, hard, iac, installation, mustang, rev, revs, rpms, shifts, start

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