now also

happened when fully stopped at red lights-Could be Steering Pump or AC Compressor-its not moving therefore the brake and suspension is out of the way for the problem.

Try disconnecting the belt one at a time to eliminate the noise from belt driven components-continues could be a transmission converter problem, check the the transmission level while engine is idling at park and drive.

Answered by rasmataz
68 questions asked

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From: fracturedbones
To: rasmataz
Posted: Sun Sep 23, 2007 4:20 pm
Subject: F150 humming noise
thanks, I will try that. Hard to find someone other than dealer...as a female they give me gobbly gook and a big bill since I am car clueless.

Take it to a community college that has an automotive program and pay them a small fee or look around the neighborhood that fixes car or you can have the boyfriend or soon to be hubby get in there and get grease up to find the noise lol.

The belts that's where we start for the noise, if not the belt come on back and I'll try my very best on it.

Hope this helps and Good Luck

Answered by rasmataz
68 questions asked

Problem posting reply but will try:
took it to mechanic, he drove it around, never heard the noise. No charge! (Imagine that!) 1 block away as I drove off...of course it started up again.....doesn't matter if still or in motion,,,is off and on.

Had oil changed at Evans Tire, guy said Fords notorious for this, something about the belt gets glazed, don't worry....so I guess I won't until something breaks???

Thanks for your help...it does seem to come from the Serpentine belt.

Response from fracturedbones
1 question asked

try taking off the eng cover to expose the idle air control valve, while the humming is happening, unplug the valve while holding the throttle open partially to keep it running, if the humming stops then you need to replace the iac valve, very easy, two bolts and one connector.

Answered by skibo1
1 question asked