Strange Whistle

[dieselman350]

I have a 05 f350 6.0 and it has developed a whistle/whine noise it does it when driving at a certain speed doesn't matter how fast but it only does it when holding a speed if you give it throttle or let off it goes away sometimes i can make it do it by brake torqueing but not always it sounds like its coming from the turbo outlet boot or around that area i took the boot off it does have some slight cracking on the outside but they dont look like they go through i looked at the y pipes they looked ok so i think its the boot but i really can't tell what do you guys think

[Int.Tech04]

if you had a boost leak, it would be more of a rushing of air noise under boost. the 6.0 is a pretty noisey motor to begin with, seeing as everything behind the front cover is gear driven instead of having a timing belt like modern gas engine.

are you hitting normal boost levels?

[dieselman350]

The boost gauge reads normal like always the truck has 300000 miles the whistle just developed about a week ago it started real slight but its getting worse i really can't tell where exactly its coming from but i pretty sure its around the turbo somewhere it's a pretty high pitch noise

[Int.Tech04]

your turbo could be on its last legs. any smoke?

we need some better knowledge in this thread. i work on rigs.

[dieselman350]

No smoke while driving only on cold starts like always

[southend]

Loose cac boot clamp, torn/busted cac boot, cracked exhaust flex joint.....

Sent from my phone that somebody didn't help me get.

[dieselman350]

Im leaning towards the boots myself

[smokeum99ta]

Leaking up pipe gets my vote.

[jimmyv13]

+1 for the up pipe flex taking a dump.

[Tuscany]

I can't believe none of you caught this yet! Plastic cac pipe on the cold side.