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Old 01-04-2014, 06:53 PM
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Squeal at high boost

I have a high pitched squeal at high boost. I can only make it happen at 38-45 pounds of boost on the highway tc locked up (passing a herd of slow pokes). I've checked my all of my boots and piping it all seems ok where should I look next? I don't think it's an up pipe because my truck will hold it's boost and egts are normal. I feel like it's boost pressure related but was told that sometimes blown headgaskets will squeal I don't know if I have one or not. Degas symptoms seem normal and no puking. I'm kind of lost I first noticed it after ebp sensor relocate but have re done it twice and used new gaskets and fittings. Any ideas?


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Old 01-05-2014, 08:05 PM
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Originally Posted by jhanso22 View Post
I have a high pitched squeal at high boost. I can only make it happen at 38-45 pounds of boost on the highway tc locked up (passing a herd of slow pokes). I've checked my all of my boots and piping it all seems ok where should I look next? I don't think it's an up pipe because my truck will hold it's boost and egts are normal. I feel like it's boost pressure related but was told that sometimes blown headgaskets will squeal I don't know if I have one or not. Degas symptoms seem normal and no puking. I'm kind of lost I first noticed it after ebp sensor relocate but have re done it twice and used new gaskets and fittings. Any ideas?


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Since 6.4L are getting old already, Most likely is, : -Engine uses a laminated steel gasket. noise is the result of an exhaust leak at exhaust manifold. most likelly passager side, look for broken studs (exhaust manifold bolts). hope this help.
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Old 01-06-2014, 04:01 PM
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Originally Posted by VictorFordTech View Post
Since 6.4L are getting old already, Most likely is, : -Engine uses a laminated steel gasket. noise is the result of an exhaust leak at exhaust manifold. most likelly passager side, look for broken studs (exhaust manifold bolts). hope this help.
Thank you for your reply I will check tomorrow. Will it be obvious like soot every where? Or very subtle?
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Old 01-06-2014, 07:12 PM
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Originally Posted by jhanso22 View Post
Thank you for your reply I will check tomorrow. Will it be obvious like soot every where? Or very subtle?
I am not sure about it. but a good signal as always will be broken studs.
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