beantown617

Lately when driving to work on cold mornings (less than 5degF) ive noticed this real loud high pitched noise that comes and goes as im driving. Sounds like a mix between eletrical feedback or that high pitch whistle u hear on a jet engine. It seems to be in and out at certain speeds, i believe it may only do it when under accelration. My guess is its just the sound of the cold air coming through the intake. Note: this is not the same sound as the bog down moan sound that most ppl get from a worn airfilter box weatherstrip. Ive replaced mine already as well.

Any other ppl get this / have explanation for it?

BoinkSwag

I'm experiencing this also, especially on very cold days. The whistling noise happens at approximately 60-61mph with the right amount of pressure on the accelerator. I searched a couple articles that pointed to either a leak along the intake system or a bad bearing in the alternator. None of the articles stated the cause of the noise with 100% certainty. If you find any additional info I would definitely be interested. The noise is super annoying

rffanat1c

Had an '05 4x4 STX do this once. Ended up being a vacuum line in the 4x4 system.

beantown617

Was it really cold out when it happend? I just had all new IWEs, solenoid, and 4x4 vacuum lines replaced just a few months ago.

Thanks

BISCUT

I had this happen to me.on an Explorer. .....it was alternator. Pitch would increase under acceleration.

Jkob10

I have the same problem, it sounds like it comes out of my rear speakers when I accelerate, I think it's the alternator too but I'm not sure how to fix it

Ford123

Most likely alternator I had the exact same problem, replaced alternator and whistle was gone.

j2004

This won't fix anything but try turning the stereo OFF. not the volume down but power off. Mine makes the same noise, only when stereo is off. May help with your diagnoses

j2004

^ only when the stereo is ON*

jordanb8812

I have the same problem when it's really cold. Mine sounds like a high pitched hum to me though, it happens with rpm more than speed with me. I think is a bearing in my case.