Chad81

I have a 2001 F150 with the 4.2L engine/5 Speed tranny and during the winter when I start it up it cold the truck is making a noise that sounds like a tea pot whistling when it's idle. When I give it some throttle the noise will go away and reappear shortly after wards. When the truck warms up the noise ceases. I sprayed some belt dressing on the belts because I suspected it was coming from a belt but the noise remained with cold starts. Almost forgot to mention that I have owned this truck since it was brand new and it only began doing it this year.

oldmanb777

Could be a vacuum leak somewhere. Or if you have an Auto trans, they can make that noise until fluid is curculated.

Good old Bill

Any CEL activity, thinking intake bolts as per TSB.