Im not talking about the the noise the filter makes as it sucks in more air, this noise Im talking about only happens during the first few miles after start up. It happens when you slow down like when making a turn, its kinda of a howl/whistle. It will go away if you hit the gas. I checked for air leaks around all the connections, I cant find any. The only thing I can think it might be is when I installed the kit, I removed that black box (by the throttle body) cus it wouldnt line up, and used that long "L" shaped tube they give you. This all started after I installed the kit. Any info would help, Thanks in advance!

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Red,1997 XLT 2WD, 4.6L V8, Auto
Stepside shortbed, painted to match hard tonneau cover, Ford factor bed liner, Prime Designs bug & rain deflectors, 2 10" Cerwin's in custom boxes, Bel radar, K&N Gen II performance kit, Hypertech Chip (on its way, thanks to Sean)



Check out my new website at:
www.homestead.com/_JJK/ford.html

 

I too just installed the K&N FIPK on my 97 4.6L. I know the noise you are talking about however, mine seems to have gone away after a day or so. Anyway, the fix is to put the "black box" back in the line. There is mention of the noise and the fix in the K&N instructions. They say it happens in "isolated instances" on the 4.6L. If you don't have your instructions, let me know and I will be happy to fax them to you or I can post just the required fix instructions here. I have had my F-150 less than a week, so I am just finding my way too!

 

Is that where they tell you to cut the end off the black box?

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Red,1997 XLT 2WD, 4.6L V8, Auto
Stepside shortbed, painted to match hard tonneau cover, Ford factor bed liner, Prime Designs bug & rain deflectors, 2 10" Cerwin's in custom boxes, Bel radar, K&N Gen II performance kit, Hypertech Chip (on its way, thanks to Sean)



Check out my new website at:
www.homestead.com/_JJK/ford.html

 

Right! As far as I can tell... You cut off the flange, use the *short* piece of hose (supplied with unit) and reinstall. Good Luck!

 

Thanks for the help/info and welcome to the site! Let me know if you ever need any help with anything.

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Red,1997 XLT 2WD, 4.6L V8, Auto
Stepside shortbed, painted to match hard tonneau cover, Ford factor bed liner, Prime Designs bug & rain deflectors, 2 10" Cerwin's in custom boxes, Bel radar, K&N Gen II performance kit, Hypertech Chip (on its way, thanks to Sean)



Check out my new website at:
www.homestead.com/_JJK/ford.html

 

When you replace the little black box the noise goes away...it acts like a muffler.

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97 F-150,4.6, Reg Cab, Flareside, Air Aid Kit, TransGo Shift Kit,
Superchips, Gibson Single Cat Back, ******* Bed Cover,
EGR Bug Shield, XL Full Length Running Boards,
Hellwig Rear Sway Bar, Hellwig 2500# Overload Springs

 

I had the same problem. The black box is called a resonance dampener. I cut off about a half inch of the plastic and cut the L-shapped tub for a better fit.
I had a good email from K&N on the subject. They plan on mentioning the noise in future printing of the instructions. Their explanation was that it is more common when in cold weather. I have had mine in for a while and now that the temp is in the low 30's every morning I hear it if I coast down a hill and let off the gas. But it still works great!

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98 F150 4x4 4.6L V8, Extended Cab, Rhino liner, tool box, rail hooks, K&N Performance Kit...

 

Big Silver,Its been in the mid 20's in the morning around here and has been since I put it on last week. Coasting downhill/turning, anytime I let off the gas it does it. I'll put the box back in line, thanks to all!

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Red,1997 XLT 2WD, 4.6L V8, Auto
Stepside shortbed, painted to match hard tonneau cover, Ford factor bed liner, "The Best Never Rest" floor mats, Prime Designs bug & rain deflectors, 2 10" Cerwin's in custom boxes, Bel radar, K&N Gen II performance kit, Hypertech Chip



Check out my new website at:
www.homestead.com/_JJK/ford.html

 

I'm having the same howl/moan with the stock air intake modified. Only noticed it when it started getting cold and did not have it last winter b4 mod was done. It must be the lack of a silencer insert(hence the name) that is causing the resonance. Of course the insert is too mangled from the removal process to reinstall...rats!

Mine also only happens after coasting and rpm's have dropped to 900-1200, then upon light acceleration it starts howling. Thought at first it was the power steering pump since it only happend after turning.

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98 F150 XLT SC 4.6 4x4 ORP,auto, 3.55 LS, Factory: towing pkg, fogs, steps, slider, remote entry; Hella driving lights, aux backup lights, K&N filter and airbox mod, Rhino lining, Roll-n-lock cover, SuperChip, fog light mod, AC mod, spare tire mount mod

 

ha ha.......DAMN noise is loud to......or should i say was.....put my little blk box back it too.......just rerouted the hoses........Dave

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1998 F-150, SC/Flairside,oxford white 4x2,4.6,auto,3.55s,nerf bars,cls 111 towing,bed liner w/mat,atlas polished wheels w/285/75 R/16 BFG A/Ts,all plastics guards/bug shields,air raid/k & n filter, superchipped, duals out the back corners, flow master 3 chamber, snug top lid, f-150 online sticker back window-honk if you see me!!! Fabtech 3 1/2 lift .coverking dash cover.
San Antonio
DWESSELS89@AOL.COM

 

Great forum, have been reading messages for past couple of weeks. Installed KN Gen 11 this morning and seems to make quite a difference. Left the black box inline and haven't been getting any noise.

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1998 ext cab 4x4 4.6 4EOD
KN Gen11

 

Have any similar problems been reorted with the airaid unit. I haven't decided which one I am going to get.

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BLK 2000 F150 XLT 4X4 SuperCab SB, Shift-on-the-fly, 5.4L, 4R70W, 3.55 LS, 4-Wheel disc/ABS, ORP, Keyless, PWR Seat, Slider, Soft tonneau, Cab steps.
MODS: Rhino, Molded flaps

 

I'm bringing this topic back to life because this is the same noise I have after installing my Air Force 1 kit. I never removed the black box and I still got the noise. Is there a fix if you still have the noise with the black box in?? Please help, the noise is really annoying!

 

Yes, the AirAid does it too, whistles like mad!! I can't see any coraltion with the cold though, I live in FL. It seems to do it in lower gears while driving. As soon as I let of the gas it stops. I thought about swithcing to the K&N but it seems to do the same thing. (Note: I just called airaid about this and the guy says it is the t/b spacer/poweraid I put on) I will remove this tonight and see if this is fixes problem and re-post)

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My Ride:
2000 Flareside EC/SB 4.6 4X2 (Harvest Gold)
Air Raid FIPK/w K&N filter
Gibson Split back duals/w tips
Factory Bed liner
Westin nerf bars (Black)
Lund vent shades, bug shield
V-Tech tail light covers (painted to match)
Tinted Windows
Factory street flares (painted to match)
(added and chg'd mudflaps)
Factory grill w/honeycomb insert
(swapped out the plain chrome one)
Tow Package (Class III)

Future Mods:
Clear corner lenses
Fabtech 3 1/2 lift with
Eagle 589's/tires to match


View my Ride: http://www.f150world.com/trippn/

[This message has been edited by Trippn (edited 03-09-2001).]

 

I've never have any kind of noise like that with my Airaid. I'd look to see if a vacuum hose got pushed off or pinched also.

Only noise I get I can't explain. Just notice that it happens everytime I go WOT and people look at me like "..what the???" Or that might just be because I'm passing them....

Hmmm...

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2000 EDDIE BAUER EXPEDITION 4x2

• Estate Green
• 5.4 ltr
• 3:55 LS rear
• Superchip!
• Airaid FIPK
• Gibson S/S Swept Side Cat Back Exhaust
• Hellwig Rear Anti-Sway Bar
• Xenon Super White Headlights
• Tow Package
• Rear Load Leveling
• Moonroof
• Century Child Seat!
• Front Polyurethane Anti-Sway Bar Bushings ordered

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