Humming...noise from air intake?

Council2 · Jan 7, 2012

2003 xlt 4.6
I am getting a random humming coming from the air intake once in awhile. If I accelerate the noise will stop until I go back to an idle, sometimes itdoes not make the noise sometime it does. Have check filter and that does not seem to be the issue. Anyone had similar or know of some ideas to look into?
This is all stock, no fancy stuff, just got the truck a couple of months ago and I'm loving it.

KC Dave · Jan 8, 2012

Does the 03 still have an IAC valve on it? (Idle Air Control) If so, Try cleaning that first.

Council2 · Jan 9, 2012

I am not sure but, that is more info than I had before so I will look into it. Thank you.

rburch · Jan 11, 2012

I had this problem and it was the IACV. Cleaning it didnt work for me, it was like new when i took it off. Replaced with a new one and problem solved!

markmiller · Jan 18, 2012

I replaced IAC also. Sounded like a horn in the intake at idle.

Council2 · Jan 23, 2012

I tried cleaning it but to no avail. So picked up a new one and replaced, been a week and problem solved thanks for the help!

buildingdoc · Feb 4, 2013

I just put a new IAC valve on my 04 4.6. I got the humming with a brand new one on there. truck runs really good with the new one, except I get the humming at idle. Should I take it back?

rburch · Feb 4, 2013

Yes take it back and get another. I had the same problem when i replaced mine!

buildingdoc · Feb 5, 2013

Any specific brand. I got an aftermarket (BWP) at oreilly... and also found people with F150's 4.6 having the same issues with motorcraft as well.

rburch · Feb 5, 2013

I got both BWP. I dont think brand matters. BWP is cheeper than Motorcraft.

Then again i never have had ANY luck with Oreily parts! It was the closest at the time!

ELVATO · Feb 5, 2013

I wish mine hummed. My sounds like it's farting.

Bleh, thanks guys for reminding me, just ordered one from Amazon. Now to look for that fuel pump... hah

But yea, usually the ones you get from the parts stores are refurbs, so they don't all fully work out of the box.

buildingdoc · Feb 6, 2013

mine wasn't labeled as a refurb. It was cheaper than a motorcraft... by $50. I also noticed today that it was getting "better"... I did have the throttle shimmed for a few months so I am thinking that the TPS is relearning the throttle positioning at idle as I do have some idle fluctuations. I will give it a few days before I consult my local Oreilly guy... it is closer, better knowledge and pricing than my local autozone. Wish we had napa still... they closed a lot of stores in the Orange County area.

Humming...noise from air intake?

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