Alright guys! Truck is a 05 F150 4.6 2V 2WD with 113,000 miles.
Truck has never gave any problems until recently it started making this funny whining sound. It's been doing this for about 2 weeks now.

After I start it up, and start slowly driving off, it sounds like there's a Whipple Super-Charger under the hood. It makes a whining noise. From about 0-40 it really starts to scream then it finally dies out.

I'm hoping maybe it's just an alternator or something! It only makes this noise after a cold start-up. I didn't know if it was my Belts [because it's time for new pulley's anyway] or what, but I'm praying it is NOT the transmission. Truck shifts perfect and yes, I do drive her a little hard

What do you guys think it could be?

 

Winter weather only?

 

Sounds like an idler pulley bearing or the phantom alternator whine I've read about.

 

Stealth, I wonder where I could find this parts and how much $$$ that would put me back.

 

Yea, it's been happening recently with the cold weather out here in Tx!
We've been having low 30-40 degree temperatures. But, even on some warmer days, it still makes that funny whining noise though.

 

I have a thread I jokingly made about it yesterday lol. For us in the cooler climates the alternators whine and it sounds like a s/c at times. I look forward to when it really is blower whine haha

 

Lmao! Well dammit. So is it something that I really need to not worry about or what? I don't want it to keep whining and that be a sign that I need to change some things out. I just researched and found numerous of threads on it. It seems like the idler pulley and alternator whinning in cold temps is norm.

I wonder do I need to replace the alternator and idler pulley though? I was wanting some new pulleys & belts from Troyer anyway, but I wasn't ready to spend the $$$. But this whining noise is annoying as hell.

 

Yeah I just live with it since its seasonal. But I do have an idler pulley squeaking at startup so that is starting to go bad.

 

Where can I get those idler pulleys?

 

It's the bearing making the noise until it warms up. Not hurting anything really, just a bit funny-sounding. I would get it every morning it got below 20-degrees before I had them replace it (idler or alternator pulley) under warranty. Haven't heard the noise in 3 years since.