High pitched squeal at start up - Ford Powerstroke Diesel Forum
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Old 09-17-2010, 04:53 AM
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High pitched squeal at start up

Is this the wastegate valve closing ?? Someone told me it is. If it is it's seems to be closing slowly now but hasn't in the past. I really need to learn my 04's motor better
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Old 09-17-2010, 01:48 PM
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There isn't a wastegate on your truck. Could be your belts making the noise.
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Old 09-17-2010, 02:08 PM
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How many miles since you changed your belt?
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Old 09-18-2010, 02:38 AM
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OK so what I read searching is true about not having a wastegate. It's not the belt. It only last for 10 seconds and sound like something is closing. You hear the squeal then a thump like a flap closed. Maybe something to do with the heat/AC system
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Old 09-18-2010, 08:33 AM
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mine does this every start up. its something with the turbo or belt. because mine will real deep exhaust note, then a sqwak then the turbo spools up to idle. i hate that sqeak
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Old 04-14-2013, 03:43 PM
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New here and I hope bumping a really old thread isn't frowned upon. I'm having a similar issue as the OP & I cannot find a cause or solution. When I start my 6.0 (2005 F-350 all stock), the truck will "lope idle" for a few seconds, then even out, then a loud quick squeal goes off followed by what sounds like a shot of exhaust leaving the tailpipe.

This is my 1st diesel truck and I'm still learning what all is going on but does anyone know what that sound is? It is not continuous, it does not make it while driving. Just a quick "chirp" or "squeal" like something closing or opening, then a big burst of exhaust leaves the tailpipe. Truck appears to drive fine w/ all power & average fuel mileage.

Any help would be so appreciated. Thanks.
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