[hammerdown]

I've never hear this before with any other car I've owned. I went out to start my mustang up and let it warm up before going to work and when I started the car I heard a strange what I would describe as a 'singing' sound.

It's not a squeak or a rattle or even a squeal. More of like a medium-high pitch hummimg and loud enough to be heard clearly over the exhaust and engine noise.

It sounded kind of like when you run your finger around the rim of a crystal wine glass but maybe not quite that high of a pitch. It was weird and only lasted for a minute or two. The Expedition reported it was 29 degrees this morning FWIW.

Anyone else ever experience this? Could I be loosing a pully bearing already (car only has 28K)?

-HD

[kgoody]

Was it raining? Your car might be singing like it's in the shower. Mustangs in general tend to be very happy cars, lol

[stlwagon]

You could have a vacuum leak somewhere.

[hammerdown]

Originally Posted by kgoody

Was it raining? Your car might be singing like it's in the shower. Mustangs in general tend to be very happy cars, lol

Yeah - good one. Ba-da-bump..

[stlwagon]

Originally Posted by hammerdown

Yeah - good one. Ba-da-bump..

Or maybe someone installed that supercharger without your knowledge!

[2oo5GT]

Sounds strange. The SC part would be sweet though. Did it stop after it warmed up or kept singing?

[Brent05redfire]

I am guessing that since the temp was that cold, you didn't get out and walk around the car to locate where the sound was coming from?
did it sound like it was coming from the back like the fuel pump or inside the car, or up front under the hood?

[hammerdown]

Originally Posted by stlwagon

You could have a vacuum leak somewhere.

Yes, I considered that too but would that sound go away? This sounded more like a tone and not so much your typical vacuum 'whistle'. And the sound was not necessarily like metal on metal, but more like something resonating underneath the hood somewhere. Additionally, the car idled steady and drove fine on the way to work. I did notice it took it longer than usual to idle down to normal when I first started it but I wrote that off to it being cold.

In response to Brent05redfire:
No I was standing out side walking headed back indoors when I first heard it (I like to let the car sit idling and warm up to operating temp on cold days). Actually it was hard to determine exactly where the sound was coming from. Might have been the fuel pump because the sound was a bit non-directional, although I'm pretty sure it was coming from the engine bay.

I'm gonna go out to the parking lot here in the next couple hours or so after the engine has had plenty of time to cool, pop the hood, start it up and see if I can locate it better.

In reponse to 2oo5 GT:
The noise did not last long, by the time the car idled down to normal it was gone and I never heard it again. 1-2 mins. tops.

[hammerdown]

Originally Posted by stlwagon

Or maybe someone installed that supercharger without your knowledge!

God do I wish. I'm having a banner month with overtime here at work so hopefully I'll have that damn thing paid off before Christmas! I'm chomping at the bit to have that sucker installed!

Although now I'm gonna damn sure run this to noise thing to ground before I go voiding my warranty !

[cavediver]

Could be a sticking or bad IAC (Idle Air Control valve). I had one do that on my Ranger and I removed it and cleaned all the carbon out of it with throttle body cleaner and it took care of the problem.

[Crazystang89]

My 09 does that nearly every morning. I just sit back and pretend it's a Procharger, and if it breaks, I'll let Ford fix it.

[stlwagon]

Originally Posted by cavediver

Could be a sticking or bad IAC (Idle Air Control valve). I had one do that on my Ranger and I removed it and cleaned all the carbon out of it with throttle body cleaner and it took care of the problem.

There is no IAC on the 2005+.

[Mr. Ugly]

Singing/whining....

Ask your bipolar gf to keep it down while you're driving

Maybe you're hearing intake noise back through your air filter?

It'll be different depending on throttle opening. Maybe at high idle, the blade is cracked open just right to make it whistle.

It was weird the first time I noticed throttle air noise coming through the CAI during idle. The sound changes a lot depending on where you stand. It's kind of directional due to coming out of the end of the intake tube.

[2Manystangs]

yeah, I'm with you on the pulley bearing or tensioner either worn out or needing adjusting, either that or the cold air is causing condensation and the water is causing a slight slipping issue = squeak

[whitey]

FEAD idler pulley. TSB-08-4-2 cold start noise when temp gets below 40 degrees. What was your temp? Part#6l3z-6c348-a is the fix. My 08GT does the same thing, didn't notice it at first because i parked in my garage but when i left work it was cold and started the noise.