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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

sounds like siren

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Old Apr 25, 2014 | 09:11 PM
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sounds like siren

When I let off the gas I hear a noise like a siren winding down. It is not real loud and the truck runs fine. Any ideas what it might be?
 
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Old Apr 25, 2014 | 09:34 PM
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Are you sure the cops weren't after you, that sounds like the Turbo winding down were you pulling, or could be that the fan was on How's your temps on the scan Gauge?
 
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Old Apr 25, 2014 | 09:53 PM
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No cops haha, I wasn't towing anything, and I don't have a scan guage, but everything on the guages looked good. It does it all the time from when I start it to the time I shut it off. Towing the trailer to the races tomorrow and am a little worried about it, but it runs good thought.
 
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Old Apr 25, 2014 | 11:44 PM
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You really need to get some kind of Monitoring and watch EOT, ECT, too many sensors to mention ( a lot ) when the truck is idleing or even at driving speeds do you hear a whistling or tea kettle sound that could be from the Turbo and even CAC boots the unisome ring in the Turbo may be sticking and splits in the CAC boots make that sound too , you have 4 boots to look at
1. Turbo inlet
2. across the front of fuel filter
3 one under each Battery.
 
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Old Apr 26, 2014 | 05:06 AM
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Depends on which end the sound is coming from... I drove my neighbors truck, F-350 V-10 and it is getting new ring and pinion bearings now. He didn't notice the noise until I made him aware of it.....
 
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Old Apr 26, 2014 | 07:23 AM
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Yes even while I am driving I hear it. How do you check the boots? Do you have to take them off to inspect them or is there another way? Thanks
 
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Old Apr 26, 2014 | 07:52 AM
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I would look for any oil build up on the boots and inspect around that area.. do you have a stock air filter or aftermarket?
 
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Old Apr 26, 2014 | 07:58 AM
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Stock air filter, and I do see some oil on the top of the motor, looks like it is blowing out of somewhere, like a fine mist.
 
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Old Apr 26, 2014 | 09:04 AM
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My turbo also sounds like one too. I just put a new turbo in. I sorda like the sound lol. Are you going to RIR if so what lot. I'm here now and could help if you need anything for the boots
 
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Old Apr 26, 2014 | 11:58 AM
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Originally Posted by noreaster3
Yes even while I am driving I hear it. How do you check the boots? Do you have to take them off to inspect them or is there another way? Thanks
To really see the crack you would have to take them off, the one to the Turbo will be on the bottom, you could take a mirror and sqeeze the boot it would show up that way too, or with truck running sqeeze and feel for air pumping at your hand. Riff raff diesel products has some real good ones they also carry OEM products aswell If needed
 
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Old Apr 26, 2014 | 12:03 PM
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if it is a boot how's the boost the gauge would tell all, any lag on the turbo?
 
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Old Apr 26, 2014 | 01:17 PM
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If you have the plastic CAC tube under the air filter it's also a possible culprit.
 
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Old Apr 26, 2014 | 01:20 PM
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I have been searching the forums because I have a low pitched "wooooo" siren type sound that is definitely turbo related. Although I haven't done much troubleshooting yet, one person wrote that their siren/howl/groan/woooo (not a whistle though) sound was due to a loose up-pipe connection. The metal gasket between the two joints was creating the sound, kind of like when you put a blade of grass between your two thumbs and blow through them to make the grass whistle. And so the metal gasket was acting like a reed.

Just a thought.
 
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Old Apr 28, 2014 | 05:20 PM
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Thanks for all the responses, I took it to the mechanic today and he checked out all the hoses, they were all good, and said that the turbo probably had some surface rust on the vains since I haven't been driving it much lately. Thanks again
 
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Old Apr 28, 2014 | 10:53 PM
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Well ya bess getout and drive that 6.0 like you stole it, Turbos don't like to sit around, specially during rainy season , they liked to be worked at most, may need a real good cleaning , you could try a few WOT but if it's real bad you would benefit from the cleaning anyway. good luck and let us know how it goes
 
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