I have an 07 4.6L Screw with ~700 miles.

It makes whining/airy noise coming when I am under acceleration from 1250-1750 RPM. It sounds like something is releasing pressure and it only does this during these RPMS. As far as I can remember it's always done it.

Is this normal?

Thanks in advanced

 

At various times that my truck has been in the shop, they've given me 2 different 2006 F150's with the 4.6. I noticed this same noise in both of the trucks. I don't know if it's "normal" or not, but it appears to be fairly common.

 

My 07 4.6 does the same thing. Sounds like the air intake is making the noise. I was thinking of adding a CAI and maybe that will fix it. I don't think it's hurting anything but it can be a little annoying at times.

 

You're right, that's the general area where the noise is coming from.

 

I have the 4.6l, I have the same noise too. I have heard that if you change the belt to a goodyear one, the noise goes away, but I am not sure. The whining does not really bother me, because the whining goes away after your reach 35 mph.

 

It wouldn't surprise me if it was a belt. Now which belt are you referring to?

 

The alternator rubber belt. I think there is a diagram pic, once you open your hood you will see it. But I am not sure if changing it to a good aftermarket one will fix the problem.