Throttle Body is whistleing

ZoomEnt · 06-16-2002, 09:30 AM

I have installed a 70mm BBK throttle body and spacer and it whistles (quite loudly) at idle only, which is 900 to 1000 rpms. As soon as the engine revs past idle every thing sounds normal. The performance is fine.

There are NO vacuum leaks. Anyone have this experience?

LX5liter · 06-16-2002, 10:00 AM

I don't have the BBK but I have heard a lot of people have that problem with them. Do a search in the archives and see what that brings up. I believe the fix is to drill a small hole in the throttle plate somewhere bu tI'm not totally sure.

HiFlow5 0 · 06-16-2002, 01:34 PM

I have a MAC TB and it only whistles when I moderately accelerate at about 1500 to 2500 rpms. Never had a problem at idle. I have heard that some aftermarket TB's do whistle. I'm not too sure about that whole drilling a hole in the butterfly of the TB. I t just seems like it would cause more idle problems. Plus if an aftermarket TB were meant to have a hole drilled in it, it would have been done so by the manufacture.

RdRunnr · 06-16-2002, 03:35 PM

BBK's are notorious for whistling. They have a fix where you drill two holes somewhere and it does away with the whistling. They send you a template that shows you were to drill the holes. Contact them and I am sure they will send it to you.

fiveohpatrol · 06-16-2002, 07:39 PM

the reason it whistles is because the little hole that is drilled in the throttle plate in there is drilled at an angle. So its kinda like you blowing sideways on a beer bottle opening.
Its not a problem unless you get too annoyed with it.

Stang Runner · 06-16-2002, 07:53 PM

I have had TONS of people Ask if I am Superchaged hehehe I have a BBK I Love the sound!!!!!

mysweetlx · 06-17-2002, 01:08 PM

Yup, me too. I get asked if I'm blown, like stangrunner, I just tell them I'm not, but she sure likes to suck!

RPM427 · 06-17-2002, 01:34 PM

The only throttle bodies that I haven't heard whistling problems with are the Accufab pieces. If you hunt around online I'm sure you can find a tech article explaining how to smooth the edges/drill a hole to stop the whistling. I think there is a recent post similar to this one explaining hoe to fix it. godd luck.

06-16-2002, 09:30 AM	#1
ZoomEnt Registered Member Join Date: Apr 2002 Location: Temperance, MI Posts: 3	Throttle Body is whistleing I have installed a 70mm BBK throttle body and spacer and it whistles (quite loudly) at idle only, which is 900 to 1000 rpms. As soon as the engine revs past idle every thing sounds normal. The performance is fine. There are NO vacuum leaks. Anyone have this experience? __________________ 90 LX "Lots of STUFF"

06-16-2002, 10:00 AM	#2
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	I don't have the BBK but I have heard a lot of people have that problem with them. Do a search in the archives and see what that brings up. I believe the fix is to drill a small hole in the throttle plate somewhere bu tI'm not totally sure. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

06-16-2002, 01:34 PM	#3
HiFlow5 0 Registered Member Join Date: Mar 2000 Location: Springfield, Ma, usa Posts: 706	I have a MAC TB and it only whistles when I moderately accelerate at about 1500 to 2500 rpms. Never had a problem at idle. I have heard that some aftermarket TB's do whistle. I'm not too sure about that whole drilling a hole in the butterfly of the TB. I t just seems like it would cause more idle problems. Plus if an aftermarket TB were meant to have a hole drilled in it, it would have been done so by the manufacture. __________________ NewEngland Auto www.baystategearheads.com -91 Mustang Coupe, ex 4cyl (sold) -99 F150, 3" lift, 35" Procomps, Magnaflow exhaust

06-16-2002, 03:35 PM	#4
RdRunnr Registered Member Join Date: Dec 1999 Location: Newark,DE Posts: 98	BBK's are notorious for whistling. They have a fix where you drill two holes somewhere and it does away with the whistling. They send you a template that shows you were to drill the holes. Contact them and I am sure they will send it to you. __________________ Eric 1990 Mustang GT 10.46 @130.97 ClickClickracing Forums

06-16-2002, 07:39 PM	#5
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	the reason it whistles is because the little hole that is drilled in the throttle plate in there is drilled at an angle. So its kinda like you blowing sideways on a beer bottle opening. Its not a problem unless you get too annoyed with it. __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

06-16-2002, 07:53 PM	#6
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I have had TONS of people Ask if I am Superchaged hehehe I have a BBK I Love the sound!!!!! __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

06-17-2002, 01:08 PM	#7
mysweetlx Registered Member Join Date: Apr 2002 Location: New York Posts: 248	Yup, me too. I get asked if I'm blown, like stangrunner, I just tell them I'm not, but she sure likes to suck! __________________ Damn this thing's fast!

06-17-2002, 01:34 PM	#8
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	The only throttle bodies that I haven't heard whistling problems with are the Accufab pieces. If you hunt around online I'm sure you can find a tech article explaining how to smooth the edges/drill a hole to stop the whistling. I think there is a recent post similar to this one explaining hoe to fix it. godd luck. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

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