"Whistle" from 4psi to 7psi - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 06-10-2012, 02:42 AM Thread Starter
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"Whistle" from 4psi to 7psi

6.0
85k miles
EGR delete
straight pipe exhaust
SCT-street

So i have the typical 6.0 sweet sounding whistle and exhaust note. This is NOT it.

I'm towing my 20ft enclosed home from the mountains after a day of riding dirtbikes at Brushy at hiway speeds. 2k rpms 70mpg using cruise on 4 lane empty hiway that goes up and down hills.

When turbo boost is over 7 psi and under load....it's whisper quiet in the cabin. but on flat straights with low load and boost between 4psi and 7psi I hear this slight and consistent "whistle" that does NOT change pitch. but occurs every single time I'm between 4-7 psi

It's kind of irritating...but there doesn't seem to be any effect to the motor or power. I can make this whistle go away with a touch of gas.

70 miles later the whistle is now LOUDER but still only occurs between 4 & 7 psi under mild load and never on deceleration...only acceleration.

After 100 miles it's so loud I can't believe it. and as I pull the truck in the garage at home it sounds like a tornado siren.

What the hell has happened?

2005 CC DRW SWB 4x4 PSD 6spd
Straight piped, SCT tuner, CTS Insight, TU EGR delete, V-tek blinker fluid, Advanced Adapter Muffler bearings
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post #2 of 7 Old 06-10-2012, 04:51 AM
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One of your turbo boots is busted, or the exhaust flex joint is cracked. Not uncommon.

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 7 Old 06-10-2012, 01:02 PM Thread Starter
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You're exactly right! Passenger side flex has soot around the base and a small spot on the exhaust pipe where it's blowing onto that. Would have never found that without your reply.

Thanks!

2005 CC DRW SWB 4x4 PSD 6spd
Straight piped, SCT tuner, CTS Insight, TU EGR delete, V-tek blinker fluid, Advanced Adapter Muffler bearings
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post #4 of 7 Old 06-10-2012, 03:55 PM
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Quote:
Originally Posted by CasterTroy View Post
You're exactly right! Passenger side flex has soot around the base and a small spot on the exhaust pipe where it's blowing onto that. Would have never found that without your reply.

Thanks!
Awesome, I been readin these threads, for months. The guys here, well lets just say, I wished I could work with these guys every day. Good people. Glad I could help.:thumbup:

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 7 Old 06-10-2012, 05:17 PM
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Caster, nice looking shortbed dually you got!!


2000 F250 CCSB, 6" Lift, 20" Fuel Hostage rims on 37" Toyo MTs, BTS Tunes & BTS Valvebody, straight piped, Tru-Cool 40K cooler, scangaugeII, Autometer triples go in this week.
AMSOIL Dealer--Xtreme Performance Synthetics--
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post #6 of 7 Old 06-11-2012, 11:14 AM
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My truck just started doing this two days ago. I going home and going to check my flex pipe, with any luck thats all I will find. I thought I was going to have to buy a Turbo. Thanks for the help.

Very helpful web site.
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post #7 of 7 Old 06-11-2012, 12:50 PM
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Got beat to the answer, but I'm glad you found it. I had an exhaust leak about a year ago and never in a million years would have guessed the sound I was hearing was caused by the leak I found.
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