I already posted this in the intake section but not getting much of a response...hopefully someone can help.

I just got done doing the DWV mode on my 06 F150 XLT 5.4L. I did the mod using the updated parts (Spectre ect..) listed in this post https://www.f150online.com/forums/3818781-post74.html.

Now that I have done this mode I have a high pitch chirping noise when under acceleration. I can only hear this noise when actualy driving the truck with the windows up. Stop the truck, put my head under the hood and have my wife hit the pedel and I hear nothing. Get back in and punch the gas and I sound like I have a small blue jay under the hood....let off the gas and the blue jay is gone...lol.

Anybody have any ideas what the issue is??

My wife thinks its the Spectre pipe making the noise as the air rushes through it.

 

First thing I would do is remove the section Spectre pipe.
If the noise is gone that was the trbl.
If the noise is still there get some bird seed.

 

Ya thats what I was going to do tomorrow I was just trying to avoid taking it all a part again...no biggie only takes a few minutes.

 

So not sure if anyone is interested but I did remove my dwv mode today and the chirpping noise went away...put it back and the chirpping noise comes back. So its definitely the mod making the noise. I did find this other thread where somone else had this issue but described it as a whistle...so I guess its just not my truck.

Not sure what I'm going to do...its not super loud but just enough to be annoying.

https://www.f150online.com/forums/20...questions.html