Im an owner of an 06 6.0 PS. driving down highway one afternoon and hear a high pitch noise. almost like that of a tuning fork or dog whistle. truck mainly does it when pyro is above 300 degrees. can hear it best at idle but will do it when accelerating or decelerating. turbo still boosts up great.turbo was cleaned and did not help. rubber boots have been replaced. bought a new exaust from turbo back and im still getting this annoying sound. any ideas?

 

I'd bet my last dollar you have a cracked up-pipe. I've had this issue before too. Makes obnoxiously loud whistle at idle, but it would kind of go away when driving and once it warmed up. Still boosted normal. It's actually not all that uncommon.

 

any idea where i can get one of them. and how much work does it involve to change? i have done some work on this truck but the extremely tight working space usually steers me away from doing engine work

 

Remove intake, take out the turbo and swap the pipe. Depends which one is cracked, usually it's the one on the passenger side that connects to the egr cooler. It's bellowed up near the top to allow flexing and it cracks right there usually. It's not a "hard" job, but it is going to be aggrivating and tedious.

 

I've had this happen on my truck too, that sound is so annoying. My EGR delete came with a solid up pipe and that fixed the problem + deleted my EGR at the same time. Two birds with one kit

 

Yep that is what I would door it was the pass side up pipe.

 

Sandusky how many miles do you have? Is your truck no longer under warranty? I had my cracked up-pipe fixed under warranty before.

 

its got 94,000 on it and warrantee is due in about a month but i have had so much trouble with ford stayin true on that stuff. when i took it to them to find out what the sound was they said it was the turbo and they couldnt cover it, even tho two days prior my egr coolers were replaced by them under warrantee. im having a kit put on for 450 parts and labor included.

 

actually the turbo is covered under the 100k mile warranty along with everything that involves the engine and egr/smog system. So id take to the and tell them to fix it.

 

based on the people i have talked to its the up pipe and not the turbo. the turbo has been cleaned and inspected. Its just easier for me to put a delete kit on it and besides i dont want anything to do with this egr bs. everythin was better when we didnt have all this emmisions regulations.

and the egr valve is not covered on the warrantee. basically ford is washin their hands of this 6.0 ltr even tho it could have been a great engine with the right people workin the issues