2005 F-250 6.0 steady whistle at highway speeds - Ford Powerstroke Diesel Forum
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Old 02-07-2014, 04:11 AM
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2005 F-250 6.0 steady whistle at highway speeds

Sounds a bit like a tea kettle, but not very loud. Pitch changes with engine speed and stops completely when I let off the throttle. No change in power or fuel mileage, starts and runs fine. Had new head gaskets & studs, oil cooler, Bullet Proof EGR cooler less than 40,000 miles ago. Have run Fleet Final Charge silicate free coolant with a filter and a new degas cap since then as well. Coolant is very clean and level has not changed, been keeping up with oil changes (Rotella-T 15W40 conventional). I have had the overboost wrench light when towing a few times, but don't think this is related. I have thoroughly cleaned the EGR valve and everything else in the system looks good (no oil dripping from the boost pipes, turbo inlet looks clean, etc.). Plan to pull turbo and give it a good cleaning as soon as it warms up (-16F this morning!)

Is this a common thing?
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Old 02-07-2014, 05:45 AM
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You may need a coolant bottle cap are you running overfull?
The new full line is just below the minimum mark on the bottle.
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Old 02-07-2014, 06:15 AM
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Degas cap gone bad? I know when I first bought my truck I'd hear it everytime I was coming to a stop. Put a new cap on and the sound went away.
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Old 02-07-2014, 06:35 AM
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Exhaust leak.

.
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Old 02-07-2014, 06:36 AM
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Running coolant at level on recall sticker. Cap is 40,000+ miles old, so may need a new one? I doubt that's what it is, though, as I can make it change pitch instantly by moving the throttle. It only makes noise at higher engine speeds (50-60 MPH). If I let off the throttle, the sound stops immediately. I'm thinking flex pipes on the exhaust. How do I check those?

If this thing needs head gaskets after only 40,000 miles of mostly highway driving, I'm done with it. I love the truck, but can't afford $3500 worth of repairs every 18 months.
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Old 02-07-2014, 07:33 AM
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Quote:
Originally Posted by tesmith66 View Post
I'm thinking flex pipes on the exhaust. How do I check those?
Have someone stick their foot over the tailpipe while you are under the truck.
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Old 02-07-2014, 09:21 AM
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I think you are hearing your turbo wind up. I thought it was normal. My truck always makes the tea kettle noise that is dependent on throttle. Has been doing it for 30k miles. Of course I got the truck at 200k and now have 230k. I am interested to hear what the fix is. I would imagine if it was a degass bottle thing then you would loose coolant. Do you loose coolant?
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Old 02-07-2014, 09:24 AM
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I'm gonna say cracked up pipe flex joint
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Old 02-07-2014, 09:26 AM
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on second thought I am going to go with the other guys who said exhaust. I am going to have someone give it some throttle while I listen under the hood. It does seem like this is where the noise is coming from? Maybe I will spray a little water on things. But not too much I dont want to crack something. Please let us know what you find.
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Old 02-07-2014, 09:32 AM
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I'm convinced it's the flex pipe(s). Would like to weld in new sections, but am concerned about the heat and anything coming loose inside and fouling the turbo. Can I simply get stainless steel braided flex joints and weld them in place of the bellows? I have seen stuff on line and on youtube showing this, but no results from anyone. Anybody here done this? Can't see spending $500 for parts if I can do it for $50. I have the welder and the experience...
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