Squeal/whistle over 20 lbs boost - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 07-10-2014, 06:35 PM Thread Starter
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Squeal/whistle over 20 lbs boost

F250 6.4 squeal - YouTube

I've been searching forums and youtube and can't find a similar sound. It just started this today. Seems to start around 20 lbs boost and over. No loss of power. Any ideas?
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post #2 of 7 Old 07-11-2014, 09:50 AM
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My truck, an 09 f350, sounds like a tea kettle once I hit 20lbs of boost. Also, no loss of power. I just had my hpfp replaced - cab off - and got the truck back from the dealer this way. They said it was an exhaust leak that they couldn't find. My research has led me to it possibly being cracked up pipes, a broken manifold bolt, or the plastic boots on the intercooler. Dealing with Ford customer service on this one....
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post #3 of 7 Old 07-11-2014, 10:00 AM
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They told you they couldn't find the exhaust leak? That's bs. If there is no soot on the firewall I would be its a broken exhaust manifold bolt.

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post #4 of 7 Old 07-11-2014, 10:29 AM
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I was fed a real line by this particular dealership. I was out of state towing a camper, and had to be out of the campground. I really don't think that they looked too hard to find the leak... they had me over a barrel and knew it. Quoted me one price to do the job and it ended up being over $1100 more than the quote. Got everything home and called customer care. They have elevated my case to some regional manager. Let's see what happens. All I can say that it wasn't whistling like a tea kettle when I brought it in, and now it does. I couldn't find any soot on the firewall, and the manifold bolts look OK. I'm going to see what Ford has to say about it...
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post #5 of 7 Old 07-11-2014, 04:33 PM
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Could be one of the charge air line boots leaking. Discharge from HP turbo to Hot pipe boot & on the other side Cold side pipe to intake/egr pipe boot. These two are the most likely to squeal from a leak & most likely were disconnected for cab off. The bottom boot on the hot pipe to intercooler usually just blows off, plus they normally wouldn't touch that one when lifting the cab to do the HPFP. There is the off chance it could be the boot at the intercooler outlet if they let that one go when they lifted the cab.

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post #6 of 7 Old 07-12-2014, 06:05 AM
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Thanks. I will check that also.
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post #7 of 7 Old 07-14-2014, 12:25 PM
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Mine was doing something similar, could only hear it at mid throttle. I'm pretty sure it was an exhaust leak but could never pin point it. All I know is that when I replaced the heads it quit. My best guess is it was an exhaust manifold gasket and it was fixed when they got replaced while putting it together. Whatever it was my low end response is better now

Quote:
Originally Posted by madpowerstroke View Post
Try spinning a turbo with compressed air and hit it with diesel clean as you inhale at the turbo outlet, I call it a turbo bong.........that's some good stuff, makes you come up with all kinds of crazy ideas.


2010 F450 Super Duty Lariat Ultimate, 140,xxx Miles. 5" DP Back. Black Maxx. AFE Pro 5R Stage 2. ARP studs new heads and gaskets.
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