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No luck! After replacing the blow off valve the truck is still making the same whistle. No change at all. They are now getting the engineers in Detroit involved but it seems that hasn’t helped anyone else. Looks like it’s time to start the lemon process to have it bought back.

I think my dealer has figured out the high pitched whistle. This time they had the truck on lifts with the trucks “driving” through the gears so they could try and pinpoint the whistle. They said my blow off valve which is more of an regenrator for the turbo was stuck in the open position...

My F-150 is doing the exact same thing. There is a whistle coming from the driver footwell that gets louder with the gear getting closer to changing. It does it on both acceleration and deceleration. It was not there for the first 800-900 miles and now seems to be getting louder and louder. It...