What is this strange whistling sound? (video inside)

[greywolf40]

At idle my truck makes this periodic whistling noise. Above 50% throttle when it should be making boost it makes the same noise, it does not spool up the turbo, and it looses most of its power. Any idea what might be causing this????

Here is the video:

2003 F250 6.0 Powerstroke --- What Is This Whisting Noise??? - YouTube

By best guess so far has been exhaust backpressure sensor. I tried disconnecting it, and it started making boost and throttle and the whistling seemed to mostly go away, but it still ran like crap.

[greywolf40]

Also I should have mentioned, no check engine lights, smoky exhaust, any problems of any kind other than this whistling sound and no power!

[smokejoke]

A/C compresser

[m-chan68]

Originally Posted by smokejoke

A/C compresser

That's what it sounds like to me.

[roustabout04]

Maybe a cracked up pipe or y-pipe?

[southend]

cracked or loose turbo boots = no boost.

[greywolf40]

Thanks for the replies!
I will check the AC compressor and lines, though it was cold out and I do not believe I had the AC on when I shot the video.
I checked all four boots for the intercooler turbo lines and they all looked fine, didn't seem to have any leaks. Same for the top boot going to the intake. I may be missing a boot or two somewhere though.
The whistling does seem to be coming from the area of the up pipe. However as I said, I can hear the turbo spooling and no whisting (mostly) when I disconnect the exhaust back pressure sensor, if the up pipe had a crack in it, wouldn't I experience the same symptoms even with the sensor disconnected?

[smokejoke]

The A/C compresser runs when you have the defroster on. Unplug the A/C compresser and see if the noise goes away or just shut off the defrost and see if the noise goes away.

[Outlaw 2007]

Mine is making a similar squealing noise and its a crack in the Y pipe

[southend]

[QUOTE=greywolf40;2950197]
I checked all four boots for the intercooler turbo lines and they all looked fine, didn't seem to have any leaks. QUOTE]

Looking at them is not enough sometimes, you may need to take them loose and clean the oil off of them, and re-tighten them. some guys have said hairspray around the connections before re-assembly may help. If they are old and deteriorated i would look at them closer. just thinkin.