Question,
I installed my K&N FIPK a couple of days ago,
I here a whistle sound when near an idle and way more prevalent when the engine is cold.
I hear it also driving with the drivers window open when I back off on the throttle.
Anyone else have the same sounds ?
I have checked all fittings and all seems ok ?
Here are some pictures

http://www.zing.com/album/?id=4292638885


[This message has been edited by jpollard (edited 05-18-2001).]

 

Most if not everybody's k&n does that. Mine does it also. I personally like it. Most likely it isn't a leak.

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1997 XLT Teal 4.6L Flareside 4x4 ORP. Automatic, Reg. cab, 3.55LS, tinted windows, bug deflector, Dual exhaust, K&N Generation 2 air filter, BullDog keyless entry/remote start, Modern 16" wheels, bedliner, Covercraft tonneau cover, White faced gauges, electronic shift on the fly, Clarion ADX5655z Double Din Cassette & CD, 4 Pioneer TS-A6865 speakers and superchip.

Future mods: Supercharger, headers, NOS, tranny upgrade(heavy duty gears, clutch packs, etc.), performance torque converter, composite driveshaft, bore cylinders 30 over, new pistons, crank, and rods, get performance heads or port the ones I have, gauges for the a-pillar, new L if they still make them and I like the way it looks, and a Z06 Vette or BMW Z3.




Click here to see more pictures

 

Mine has never made a noise, I don't think this is normal.I would call K&N. goodluck

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01 supercrew,4x2,all black,5.4,captains chairs,355 ltd slip,trailer tow grp,remote keyless entry.
(MODS)gibson supertruck,K&N generation II air intake,expy console,lund intercepter,A.R.E LSII hard tonneau,tinted windows,E&G classics mesh speed grill,mud gaurds,ford seat covers, bed liner,ventvisor's,westin chrome nerf bars,smittybuilt outland sport bumper guard,KC highlights, Hella fogs, Jensen flip down 6.8 TV, santeca 4" TV in passenger sunvisor,DVD player,panosonic cdqf800 fm-cd,pioneer 6865 speakers.

 

Mine "whistles" too. I believe that it's nothing more than the engine vacuum that you can hear through the much less obstructed intake system. I wouldn't worry about it if you checked all your connections and they're on right.
Mine even "whistles" a little louder now that I tweaked my throttle body ever so slightly !

 

Thanks for the replies. Yes I some what agree that this is normal. Having said that I, I was wondering about rotating the MASS airflow senser say 90 degrees. The reason I was going to try this is that the whistle/vacum noise i hear is coming (apears) from the filter area and turning the MASS 90 degrees would put it closer to the orginal position i.e. have the electric conection point down, Right now I have it pointing forward. any other ideas?


[This message has been edited by jpollard (edited 05-19-2001).]

 

Same here. I disassembled everything and checked the connections, but I still have it. Doesn't bother me as much as before, expecially with the windows rolled down in the summertime.

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1999 4x4 F250 LightDuty XLT SuperCab 5.4L, 3.73, 4R100 trans.
Flowmaster exhaust, K&N FIPK, Superchip, Rancho RSX shocks, Hellwig rear swaybar, Stull billet grille, PIAA Air Dam with 2-PIAA Pro80XT's (85W Superwhites), 4-KC Daylighters (150W), Leer 100XL Shell, Performance Accessories 3" Body Lift, 33/12.5/17 ProComp Mud Terrains on 17x8 American Racing Atlas Rims. Kenwood 7007 CD, Alpine 3342 Signal Processor, Alpine MRV-F353 5Ch. Amp, Pioneer TS-A6865 3-way speakers, MTX Thunderforms. CompuStar alarm/autostart.

 

The K&N instructions tell you how to deal with the whistle on the 4.6 liter engine. If I remember correctly it involves trimming off some of the intake tube near the throttle body. Just refer back to the instructions and you should find it. I have the 5.4 liter and mine has never had a whistle.

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2000 Harley/Davidson F-150
Lund Bug Deflector
Ventshades
Century "Cargo Cover"
K&N FIPK Gen II
Superchip!!!
89 F-150 Lariat 4X4 for the "dirty work"!

[This message has been edited by Snyper (edited 05-19-2001).]

 

Snyper,
Yes I might review the instructions for the 4.6 as you said, mine is a 5.4 so those really shouldn't be relevent to my engine,but hey anything is possible. Before i do that I am calling K&N about it though.

 

I have an Airforce One which showed the MASS airflow sensor installed 90 degrees from your installation. (Connection on the bottom). I have no whistle but I do wonder what is the correct position for the MASS ? It can't just be any position. Anyone know?
I have the same airfilter. A whistle has GOT to be an air leak. How about the other sensor that used to be facing the engine?



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2001 Expedition 5.4L XLT
4WD + Towing Package
Edelbrock IAS
Superchip
Gibson SS Side Swept
Air Force One
Mobil 1

 

Redex,
Well I just tried rotating the Mass airflow sensor. It made no difference. But here is what happened I drove around for about 15 mins engine was well up in its normal temp range and the air noise was still there, kinda like a tire leaking noise. Anyway it kept makeing the noise, i then drove home and rotated the MASS back to its position that I orginally had it (like the photo) I thn started it up and NO noise I drove around and still no noise other than a little whoosh when I back off on the throttle to slow down. Well I have to believe that it is tempurature related ? and shutting down the truck and restarting it had some thing to do with it as well.
I don't know but I have to resolve this as it is driving me nuts !

 

If it doesn't start making noise again then it was probably a small leak at the hose where you rotated the MASS. A vacuum leak can be very stubborn. The slightest bad fit or the hose clamp not tightened against a smooth surface will cause a whistle. I used to do pipefitting and there was an old saying that it was easier to get a leak on a vacuum line then a pressure line but nobody would see it . There is a high degree of vacuum on a the tube.
I recheck my clamps once a week half expecting trouble.




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2001 Expedition 5.4L XLT
4WD + Towing Package
Edelbrock IAS
Superchip
Gibson SS Side Swept
Air Force One
Mobil 1

 

I had the same concern on my 4.6L.First make your tubes as short as possible.If that doesn't work(it should),remove your idle air bypass valve and clean it thoroughly with a carb cleaner.I replaced mine and have not had anymore noise at all.It seemed that if I goosed the throttle the noise would go away.Good luck.