Originally Posted by FordServiceCA
Are you able to schedule an upcoming appointment with a dealer, ecokid? I know it's often difficult to make it there, but certified Ford dealerships are best able to diagnose the noise you're hearing. I suggest getting it there as soon as you can.
Let me know when you schedule that appointment, along with your truck's model year and an updated odometer reading; with this information, I'll be able to look into some available options.
I have 3400k km on my ODO and I find I get a bit of non-boost squeel or rattle sound when I am at about 1200 RPM and touch the gas or when letting it back down.
talking to my buddy who is a drivability tech, he says that its very possible that one of the turbo's are siezing...
I'll have to bring it in sometime, but as I have a catback, I'll have to make sure I bring it to my buddy, so they can't say it was the exhaust that's causing this to happen.
Could be a manifold leak too? but I do have to admit, I hear it more since I put on my exhaust (hoping I didn't break anything when removing the stock exhaust)