I've poked around the forum a bit, and looked at threads about the noise issues...most seem to be fog light related.
2005 F150 4X4 supercab 44k miles no fog lights....
I get a noise, almost like feedback at 1800 to 2000rpms in subzero weather. I brought it in to the dealer, they said they had one problem last year, and said it was a iced PCV vave. I suppose to bring it back when the only tech that has worked on this will return from vacation. When I inquired at another dealer, they mentioned they also heard of this problem, and said it "could" be a vapor management valve leak....
The first dealer said it'll go away when it warms up....in northern NY that won't be untill April!!!
IF the PCV valve needs replacement, at 44K miles, shouldn't that be a recall type issue, especially when it costs $140, just for the part
Has anyone encountered this?