High pitched turbo whistle

[dannyf]

Hey guys, took a 600 mile round trip pulling a 7x12 enclosed trailer with my two bikes in it. About 75 miles from home I started hearing a high pitched whistle almost like a tea kettle. The sound only happens under 10psi and as soon as I feed it some throttle it goes away. My delta was never more than *10 and I have no puke from the degas bottle so I don't think its the cracked or bad cap whistle. Anybody have any pointers on where to start looking.

[southend]

Originally Posted by dannyf

Hey guys, took a 600 mile round trip pulling a 7x12 enclosed trailer with my two bikes in it. About 75 miles from home I started hearing a high pitched whistle almost like a tea kettle. The sound only happens under 10psi and as soon as I feed it some throttle it goes away. My delta was never more than *10 and I have no puke from the degas bottle so I don't think its the cracked or bad cap whistle. Anybody have any pointers on where to start looking.

Exhaust flex joint, intake boots. Not uncommon. Look for soot on the firewall.

Sent from my SCH-I500

[dannyf]

Originally Posted by southend

Exhaust flex joint, intake boots. Not uncommon. Look for soot on the firewall.

Sent from my SCH-I500

Checked all the boots and I don't see any soot near either of the flex joints. Just to make sure I power braked it for a second with my brother watching and no soot or smoke anywhere near the engine bay. The squeal is ear piercing and only happens at near 0 boost levels(idle and just off idle). I thought it might be a pulley bearing but it doesn't change with engine speed at all, it seems to only be boost related. I took the intake boot off and spun the turbo by hand it spins smooth and doesn't have any play in it and sounds fine at boost and during spin down after shutting the truck off.

[southend]

Ok, so you looked, but you just haven't found the split boot, our loose clamp yet. Sometimes hard to see.

Sent from my SCH-I500

[dannyf]

Is there a way to check for unseen damage and leaks? or do i just start throwing parts and time at it until its fixed?

[southend]

Originally Posted by dannyf

Is there a way to check for unseen damage and leaks? or do i just start throwing parts and time at it until its fixed?

that is the point I'm trying to make. You need to pull that crap out so you can put your eyes on it. Or just throw parts at it.

Sent from my SCH-I500

[Tuscany]

Check the clamps on the exhaust up pipes going to the turbo. Did you have the turbo off of it lately? That'd be my guess as I had the same problem when I replaced my hpop I thought I had it on there all the way but after test driving it the pipes hadn't settled all the way and caused an ear splitting hiss or whistle in the cab. I thought my turbo was on its way out but I checked the clamps and they were loose again. Try tightening them up and see where that gets you.

[dannyf]

I have today off so i will go through and check the piping and boots. Also will make sure the up pipes are tight. Hopefully its not a whole in the flex section of the up pipe because they look like a PITA.