Cold Weather High Pitch Noise
 

I've poked around the forum a bit, and looked at threads about the noise issues...most seem to be fog light related.

Vehicle:

2005 F150 4X4 supercab 44k miles no fog lights....

I get a noise, almost like feedback at 1800 to 2000rpms in subzero weather. I brought it in to the dealer, they said they had one problem last year, and said it was a iced PCV vave. I suppose to bring it back when the only tech that has worked on this will return from vacation. When I inquired at another dealer, they mentioned they also heard of this problem, and said it "could" be a vapor management valve leak....

The first dealer said it'll go away when it warms up....in northern NY that won't be untill April!!!

IF the PCV valve needs replacement, at 44K miles, shouldn't that be a recall type issue, especially when it costs $140, just for the part:eek:

Has anyone encountered this?

140$ pcv valve???? 5$ at autozone. sure you mean pcv?? anyway ford power steering pumps are notorious for squeeling in cold weather startup. my 96 crown vic does it. goes away after 5 mins of drivimg.

That's what Ford had on their system..$140....something about a heater hose assembly...:mad:

I wouldn't pay that anyway...

It's definetly not the P/S pump...it's consistent at highway speeds, 65mph.
If I give it gas, or let up on the gas it stops. I looked for hoses, lines or other things that might not be connected, but so far nothing.

I went through all vacuum related items while driving, it didn't change at all. Tried wipers, looked for debris in the grille, nadda.

:help:

I’ve got an 05 FX4 with about 30K.

I’m getting more of a high pitch whine. It only last for 2-5 seconds. I’m not sure if its cold weather related though. It happened once about 2 weeks ago then 2 times last week, and this morning 3 times.

Hit the gas or let off makes no change. Turning the fan on off makes no change. Steering left or right makes no change. Cruise control on or off makes no change. Hell I even checked the radio and still no change. Its not consistant so I can’t find it. By the time I stop the sound is gone.

I’m still under warranty so I’ll be taking it in soon.

i dont know man lol.usually its belt related when its high pitch annoying squeel like that. see what ford says that what warranty is for..

I initially thought it was the belt too....this is my fourth Ford truck since 1982, have driven almost 600k miles total in the first three, and have been through what should be every "wearing part" issue there is....(I'm sure there's more ;) )

It's not the belt.

From what the first dealer (where I purchased the truck) said, condensation from the crankcase freezes in the PCV, creating a small orafice where it'll make the noise at certain pressures.....(sounds good?!)....since it's been well below freezing for weeks, I won't know if it is the exact cause until it warms up.

The second shop thought it could be a "vapor management valve".....in the location of the noise...behind the motor. In any case it sounds pressure-vacuum related. I'm at a loss....

I have an extended warranty untill 75k....

Hopefully someone will give more ideas as to the cause....

There has been some discussion on this as of recent and I'm still a believer that it is the IAC. Mine does it right around 1500-1600, constant throttle....let off and it immediately goes away. I'd say start there...

OK will do....I just spoke with our fleet mechanics..should have done that first!.....they mentioned that this was an issue in the ast but they (Ford) was supposed to put some type of insulation on the PCV assembly....he gave me some "Dragon Fire" carb cleaner, said to flush it out.

I'll do that first, then check the IAC....(wherever that's located!)....I'll inform all of the outcome.

Thanks for all your help and suggestions thus far!

High Pitch Noise at 1800 rpm
 

2005 Ford F-150 Flareside

I have a high pitch noise at 1800 rpm and goes away when I step on it or slow down. If I kept the rpm at 1800, it would squeal continuously. Notice it worse in cold weather -20 C. and thereabouts.

Anyone found the source of this yet or a solution?

Dealer found my problem
 

I started getting the same kind of high pitched wine when the temps drop a couple of weeks ago. Took it to the dealer and the driveline tech knew what it was right away. They replaced the alternator and it's fixed. I would hear the sound a little at lower speeds but always and 54mph and 61mph. I would have to hold it at one of those speeds for a second or two and then I would start hear it. As soon as I let up or accelerated it would go away.

I have this exact problem in the 1800-2000 RPM range. It is throttle related because the noise goes away when you let off the throttle. Has anyone found the cure?

Judging from my truck, I'm sure its the air intake! It sucks up air from a hole on the driverside and at 1800-2000 rpm its makes like a small whistle sound. Mine did it stock and now with the aftermaket intake its even louder! And like you said at 1800 rpm its steady whistling high pitch sound; i'm 90% thats what your hearing! I'll film it with and without the aftermarket intake (stock is just a little bit more quiet)and you'll hear it for yourself but all I know is that its not harmful for nothing! I know for sure its the intake or maybe throttle body. Don't worry and don't call it a problem lol!!!

The only that doesn't explain is why this only happens in cold weather. In warm weather you would still have the same amount of air entering the intake. I've read the PCV explanations and that seems reasonable, but I don't know if that is the problem for sure. I also don't know if there is a fix.

Mine does it in the summertime too maybe you just didnt notice it!?!?

I don't think you have a PCV valve if it's a V8 - It would help if you post what engine we're talking about here :rolleyes: - Must be a V8, that's why it cost so much/ different type system.

Heated PCV assembly-

https://www.f150online.com/forums/me...if-gen-ref.gif

Cold Annoying whistle
 

My 2005 SCREW 4.6 Stock. Is doing the same thing. I am hesitant to start throwing parts at it. Hopefully someone can figure this out. I tried carb. clean it didn't work.

I have a 4.6 and the little whistling noise you hear coming out of the intake area is normal...put an aftermaket intake/TB spacer and it's gonna be even louder!!!!I actually like it lol!!! I don't know exactly what cause the whistle but mines been doin it since I bought it brand new(stock) and I know for sure its not harmful for anything...I wouldn't even worry about it!!!

i have an 06 5.4 and i had the same prob i took it to the dealership and they ended up pinpointing it to the altenator so they replaced it and the whine is gone.....

Nahhh the noise I'm hearing come from the intakre area 100% sure of it!!!!I can play with the sound with the gas pedal!!!I could almost whistle at near by chicks lol!!!!Anyways back to the subject...I ain't sure Exactly what it is but if you have a 4.6 and it whistles a 1800-2000 rpm it's normal I mean my alternator couldn't of been bad when I bought it brand new(I hope anyways lol) but I had and 03 king ranch(5.4) and it never whistled like my 07 4.6 does!!!4.6 whistling...get used to it, its normal!

Actually one of my buds is a mechanic whos been working for ford quite a while, I'll try to figure out with him EXACTLY what's whistling in the 4.6 but 5.4 can't really help ya(check your alternators)!!!!!

Adkleaddog. Any luck!! I am also looking for a fix.

I have noticed the same thing on my 05 here in wisconsin. sits in a heated garage and as soon as I hit 68 -70 mph on the drive to work on a 15F or less morning something makes the noise. 71mph or 67 mph the noise is gone.

Just FYI if you have a 2007 or 2008

TSB 08-4-2

COLD START FEAD HOOT - WHISTLE NOISE / BUILT BEFORE 1/28/2008
Publication Date: February 7, 2008

FORD: 2007-2008 Mustang, Expedition, Explorer Sport Trac, Explorer, F-150, F-150
LINCOLN: 2007-2008 Mark LT, Navigator
MERCURY: 2007-2008 Mountaineer


ISSUE:
Some 2007-2008 F-150, Mustang vehicles equipped with a 4.6L and 5.4L engine; 2007-2008 Mark LT, Expedition, Navigator vehicles equipped with a 5.4L engine; Explorer, Mountaineer, Explorer Sport Trac vehicles with 4.6L engine and built before 1/28/08, may exhibit a front end accessory drive (FEAD) related high-pitched metallic whistle/hoot noise after a cold soak in ambient temperatures below 40 °F (4.4 °C). This noise may be caused by the grooved nylon FEAD idler pulley.

ACTION:
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

NOTE: FEAD IDLER PULLEY NOISE MAY BE MOST APPARENT AT OR NEAR COLD ENGINE IDLE SPEEDS (APPROXIMATELY 1200 RPM). NOISE DURATION IS LESS THAN 10 MINUTES AFTER STARTUP AND WILL BE ELIMINATED WITH FEAD BELT REMOVED.



Replace the nylon FEAD idler pulley, refer to Workshop Manual, Section 303-05.

PART NUMBER PART NAME
6L3Z-6C348-A Idler Pulley


WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATION DESCRIPTION TIME
080402A 2007-2008 Mustang 4.6L: Replace FEAD Idler Pulley Includes Time To Remove And Install Serpentine Belt (Do Not Use With 8678A, 8620F) 0.3 Hr.
080402A 2007-2008 F-150/Mark LT 4.6L/5.4L: Replace FEAD Idler Pulley Includes Time To Remove And Install Serpentine Belt (Do Not Use With 8678A, 8620F) 0.3 Hr.
080402A 2007-2008 Expedition/Navigator: Replace FEAD Idler Pulley Includes Time To Remove And Install Serpentine Belt (Do Not Use With 8678A, 8620F) 0.4 Hr.
080402A 2007-2008 Explorer/Mountaineer/ Sport Trac 4.6L: Replace FEAD Idler Pulley Includes Time To Remove And Install Serpentine Belt (Do Not Use With 8678A, 8620F) 0.4 Hr.