Loud Thottle Body Whistle!

69clark · May 22, 2007

I am gettting a loud whistle from my TB and was wondering if anyone knows how to fix it. For anyone who doesn't know I have a Fox TB conversions. I have heard that others have had this problem, but mine is loud, sounds like I have a second supercharger under the hood.

It only whistles when the TB is closed. With that being said I don't know if it is the butterfly whistling or if it is the IAC whistle letting air in the intake. I would like to fix this this weekend so any help would be appreciated.

Blackened302 · May 22, 2007

when i first did the swap, there was a LOUD whistel---sounded like a donkey, almost, hahaha.

anyhow, i had my IAC upside down--that cured it.

Bosko5.0 · May 23, 2007

You know when you blow over the end of a pipe with one side closed and it whistles. same concept, maybe try sanding (smoothing) the ridge of the intake hole for the IAC that should solve the problem just do a little at a time til it stops.

What TB are you using??

69clark · May 23, 2007

75mm Pro. Prod.

dlaul01 · May 23, 2007

Mine does the same thing i want it to stop as well if anyone know a solution

gcomfx.com · May 23, 2007

When we did a smoke test on my vacuum lines we found that the BBK T/B was leaking at the bolt that goes through it and holds the butterfly. It has a small leak on the side the spring/throttle cable attaches. You might try putting your finger around that bolt. If the sound changes you found it.

mackey · May 23, 2007

gcomfx.com said:
When we did a smoke test on my vacuum lines we found that the BBK T/B was leaking at the bolt that goes through it and holds the butterfly. It has a small leak on the side the spring/throttle cable attaches. You might try putting your finger around that bolt. If the sound changes you found it.

How do you do a smoke test on vacuum lines? Sounds like something I might be interested in trying to check for leaks.

gcomfx.com · May 23, 2007

Took my car to an auto tech school. The instructor was a friend of a friend. He had some weird little machine on wheels that pumped out smoke. You plug it into a vacuum line and it fills the engine with smoke. You'll see any leaks easily. Takes a little while to fill the whole engine intake and everything, but eventually it'll come out the air filter. That's when you know it's full. Pretty cool really.

69clark · May 24, 2007

Any other ideas, I want to knock it out this weekend. Good ideas so far.

gcomfx.com · May 24, 2007

Maybe it's an echo from the Paxton?

WHITE94COBRA · May 24, 2007

On my bbk I drilled a very small hole on the butterfly. No more whistle..

69clark · May 24, 2007

How small? 1/16, 1/8?

69clark · May 24, 2007

Also, did you drill the hole because of the whistle or idle surge issues?

WHITE94COBRA · May 24, 2007

Both reasons, but mainly the whistle, it didnt really surge all that bad. In my drill index it was a #53, or .063. Hope that helps. They are matco drill bit's I chose one of the smallest sizes.

69clark said:
Also, did you drill the hole because of the whistle or idle surge issues?

Loud Thottle Body Whistle!

69clark

Blackened302

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Bosko5.0

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69clark

dlaul01

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gcomfx.com

mackey

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gcomfx.com

69clark

gcomfx.com

WHITE94COBRA

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69clark

69clark

WHITE94COBRA

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