Whistle at idle
Postmaster
Joined: May 2002
Posts: 3,028
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From: Annapolis, Maryland
Whistle at idle
Most likely, it's coming from the hard piping that runs from the IAC valve to the intake. Locate the IAC, then trace the piping around the right side and back up to the intake. Replace this whole length (it will consist of rubber hose, hard plastic piping, and a little plastic "potato" looking thing) with a 24"-26" length of 1/4" heater hose. That should quiet it right down.
This is our preferred solution to intake whistling problems that usually arise from aftermarket intakes. Aftermarket intakes will aggravate the whistling, but upon further inspection, I found that the OEM intake whistled, too.
Let me know if you need further assistance!
XXL
This is our preferred solution to intake whistling problems that usually arise from aftermarket intakes. Aftermarket intakes will aggravate the whistling, but upon further inspection, I found that the OEM intake whistled, too.
Let me know if you need further assistance!
XXL
Senior User
Joined: May 2003
Posts: 135
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From: Baltimore
Whistle at idle
Hey Matt, how's the heat down in Annapolis, miss that rain don't ya? I just replaced my intake pieces and I want to do this mod that you just described. Is the IAC the squar-ish box that sits up next to the throttle body and is connected to the intake tube/piping? If so mine only has about 3" of replaceable tubing going into the intake tube and it's about 5/8 or 3/4 in diameter now. This must not be what you are talking about, clear me up neighbor.
Postmaster
Joined: May 2002
Posts: 3,028
Likes: 1
From: Annapolis, Maryland
Whistle at idle
Oh it's nice and hot down here. Humid, too. Like being in a damn jungle 
To find the IAC: remove the black plastic "Triton" cover over the throttle body. Look right behind the TB, on the left. There is a little thingamajig back there - attaches to the rear of the TB with 2 bolts. This is the IAC. If you look, there is a small length of rubber tubing coming out from the IAC, moving right and behind the TB. From there, it turns into a hard plastic molded hose which wraps around the right side and reenters the intake right before the TB (There are 2 hoses that meet the intake right there; this is one of them). Anyhow, remove all the tubing from the IAC all the way to the intake, and replace it with about 26" of 1/4" heater hose. I'm going to attach a picture for you. This is a 5.4 TB - if you look towards the rear, there is a silver thing sticking out that's outlined with a thin orange line - this is the IAC. There is a length of black hose pointed down (I colored it orange.) That's the hose that needs to be replaced - notice the funky black plastic cylinder - as far as I'm aware, it serves no purpose.
Let me know if you need any more help!
Take care!
XXL
To find the IAC: remove the black plastic "Triton" cover over the throttle body. Look right behind the TB, on the left. There is a little thingamajig back there - attaches to the rear of the TB with 2 bolts. This is the IAC. If you look, there is a small length of rubber tubing coming out from the IAC, moving right and behind the TB. From there, it turns into a hard plastic molded hose which wraps around the right side and reenters the intake right before the TB (There are 2 hoses that meet the intake right there; this is one of them). Anyhow, remove all the tubing from the IAC all the way to the intake, and replace it with about 26" of 1/4" heater hose. I'm going to attach a picture for you. This is a 5.4 TB - if you look towards the rear, there is a silver thing sticking out that's outlined with a thin orange line - this is the IAC. There is a length of black hose pointed down (I colored it orange.) That's the hose that needs to be replaced - notice the funky black plastic cylinder - as far as I'm aware, it serves no purpose.
Let me know if you need any more help!
Take care!
XXL
Last edited by BigMattXXL; Jun 28, 2003 at 12:50 AM.
Senior User
Joined: May 2003
Posts: 135
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From: Baltimore
Whistle at idle
Thanks Matt but my 4.6 doesn't look like that. The only tube from the IAC to the intake on mine is the one I described, 5/8 heater hose with a squar-ish black box inline. I looked at the box and saw nothing inside, so I have no idea what it does.
Postmaster
Joined: May 2002
Posts: 3,028
Likes: 1
From: Annapolis, Maryland
Whistle at idle
Well, if you have an IAC, similar to the one in the picture, then I would go ahead and replace that hose that's nearby as per the instructions, only subsitute another size heater hose that will fit appropriately - the key is replacing the molded plastic parts with soft rubber. The plastic is prone to whistling. Let me know what you come up with.
XXL
XXL
Senior User
Joined: May 2003
Posts: 135
Likes: 0
From: Baltimore
Whistle at idle
When I get back from vacation I plan on taking some digital pics of my mods, if you can use any for your project that would be great. I'll get my mechanic to put it up on his lift so I can get some really good shots of the catback and sway bar installs. I'll pull the Triton cover off and show you what I did to that hose in a seperate pic.
On another note I ordered the Transgo Shift Kit, AODE/4R70W TransGo SKAODE TR10359, for $40 from KDS. When my mechanic services my tranny I plan on having him install this. I'll be almost fully modded then-chip will have to wait till I can sell off some more basement junk on Ebay.
On another note I ordered the Transgo Shift Kit, AODE/4R70W TransGo SKAODE TR10359, for $40 from KDS. When my mechanic services my tranny I plan on having him install this. I'll be almost fully modded then-chip will have to wait till I can sell off some more basement junk on Ebay.
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Joined: Aug 2002
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Whistle at idle
Thanx Matt...I'll check it out tonite after work.
Just out of curiousity, why does simply changing from plastic pipe to hose make a difference?
Just out of curiousity, why does simply changing from plastic pipe to hose make a difference?
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Postmaster
Joined: May 2002
Posts: 3,028
Likes: 1
From: Annapolis, Maryland
Whistle at idle
Originally posted by EZmoney
Thanx Matt...I'll check it out tonite after work.
Just out of curiousity, why does simply changing from plastic pipe to hose make a difference?
Thanx Matt...I'll check it out tonite after work.
Just out of curiousity, why does simply changing from plastic pipe to hose make a difference?
Go figure
XXL
