weird whistling osund when excelerating???
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Junior User
Joined: Nov 2004
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weird whistling osund when excelerating???
I have a 04 stx 4x4 4.6 v8, great truck, had it for about 5 years, have a edge tuner , magnaflow muffler. in the past few days been getting really cold here in illinois, i kow my belts will make noise till it warms up, but then when driving later, everytime i give it gas i hee a small light whistling sound, when im not giving it gas it goes away, when i gas it comes back, anyone have any ideas???
Last edited by stx4x4; Nov 30, 2009 at 09:27 PM. Reason: made more sence now
Senior User
Joined: Jan 2008
Posts: 380
Likes: 0
From: mississauga ont.
I also had this problem when it starts getting cold,
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
Thread Starter
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Junior User
Joined: Nov 2004
Posts: 97
Likes: 0
I also had this problem when it starts getting cold,
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
Senior User
Joined: Jan 2008
Posts: 380
Likes: 0
From: mississauga ont.
Found it on an older site
TSB-08-4-2
Cold Start Fead Hoot-Whistle Noise-built before 1/c
Pub. Date Feb 7, 2008
F150
5.4 and 4.6 engines built before 1/28/08 may exhibit a front related high pitched metallic whilstle/hoot noise after a cold soak 4.4 C. Noise may be caused by the grooved nylon FEAD idler pulley.
Service procedure to correct. Replace the nylon FEAD idler pulley 6L3Z-6C348-A Idler Pully.
not sure if changing the pulley is the best thing
I would get a new alt. put in it worked for me.Had 80,000 klm when changed now 130,000 and 2 winters no problem.
TSB-08-4-2
Cold Start Fead Hoot-Whistle Noise-built before 1/c
Pub. Date Feb 7, 2008
F150
5.4 and 4.6 engines built before 1/28/08 may exhibit a front related high pitched metallic whilstle/hoot noise after a cold soak 4.4 C. Noise may be caused by the grooved nylon FEAD idler pulley.
Service procedure to correct. Replace the nylon FEAD idler pulley 6L3Z-6C348-A Idler Pully.
not sure if changing the pulley is the best thing
I would get a new alt. put in it worked for me.Had 80,000 klm when changed now 130,000 and 2 winters no problem.
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Elder User
Joined: Apr 2008
Posts: 507
Likes: 0
From: south shore massachusetts
I too have this... only when cold... I do have a CAI... I just ignore it till the engine warms up and it goes away.... I did see the TSB on the alternator... strange that that could be the culprit....last thing I would have thought of
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Junior User
Joined: Nov 2004
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well took it in to the dealer today, they has to replace the tentioner pully and replace the belt, all 278.00 dollars, but its quite and runs good, think the belt was going , now it feel like it has no sliping then before
Junior User
Joined: Aug 2005
Posts: 53
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I also had this problem when it starts getting cold,
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
A lot of the problems seemed to be the alternator. Mine was and had it replaced under my extended warranty . if you still have warranty, get the alternator checked an replaced. If you don't have warranty, go get a new alternator and replace it. It will more than likely fix your problem.there was also a TBS on it
Good luck!
Laughing Gas
Joined: Dec 2009
Posts: 799
Likes: 13
From: East L.A.
well this is certainly an odd thing. I've been hearing a similar noise with the cold (1st winter with this "new" used 06/4.6). I was thinking along the lines of the vent system in the cab or radio feedback noise.
So the noise is a cold tensioner pully? Too wierd. It goes away pretty quick while driving.
So the noise is a cold tensioner pully? Too wierd. It goes away pretty quick while driving.
Senior User
Joined: Jan 2008
Posts: 380
Likes: 0
From: mississauga ont.
well this is certainly an odd thing. I've been hearing a similar noise with the cold (1st winter with this "new" used 06/4.6). I was thinking along the lines of the vent system in the cab or radio feedback noise.
So the noise is a cold tensioner pully? Too wierd. It goes away pretty quick while driving.
So the noise is a cold tensioner pully? Too wierd. It goes away pretty quick while driving.
