High pitched turbo whistle - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 06-25-2012, 06:21 PM Thread Starter
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High pitched turbo whistle

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.
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post #2 of 11 Old 06-25-2012, 07:25 PM
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Originally Posted by dannyf View Post
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

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
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post #3 of 11 Old 06-28-2012, 03:14 PM Thread Starter
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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.
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post #4 of 11 Old 06-28-2012, 03:41 PM
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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

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
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post #5 of 11 Old 06-28-2012, 05:39 PM Thread Starter
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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?
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post #6 of 11 Old 06-28-2012, 05:59 PM
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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

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
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post #7 of 11 Old 06-28-2012, 08:27 PM
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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.

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post #8 of 11 Old 06-29-2012, 02:10 AM Thread Starter
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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.
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post #9 of 11 Old 12-27-2014, 10:16 AM
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Any update?

2004 F-250 FX4 Lariet
Scangauge II
Maxtow gauges (fuel press,egt,boost)
High idle mod
Zoodad mod
CCV mod
Atlas 40 ficm tune
Sct X4 / Gearheads SRL tune
Blue spring upgrade
PMM bypass coolant filtration kit
PMM full egr delete
Diamond Eye 5" turbo back straight pipe
AFE stage 2 intake
Zerex ELC Cat-1 coolant
Rotella T6 oil
2 bottles of Rev-X
Diesel kleen/ Howes fuel treatment
Firestone rear helper springs/air bag suspension
Aux 50 gallon fuel tank/tool box in bed
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post #10 of 11 Old 12-29-2014, 07:43 AM Thread Starter
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Any update?
ended up being a crack in the flex pipe on the Y pipe, installed the new flex pipe and EGR delete in a weekend and put another 80k miles on the truck before selling it.
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