Hissing wine sound

[vince harding]

If I am going about 50 mph and then i stick it, I hear what sounds like a boost
Blowby. It does this for like 10 mph intervals. If I take it out of gear the sound goes away and it does not do this under lite acceleration only when boost is being built . I took it out of gear to varify that it wasent my drivetrain. Any ideas. Thanks

[nine6stroker]

Maybe a cracked/torn boot somewhere??

[vince harding]

Well I am pretty sure my internal turbo seals are leaking cuse I've got oil on my intake galley and the orange boots going from the turbo tithe heads are oily I checked my hpop and it's dry but the noise seems to be lower than the engine. It will not make the noise in neutral when I rev up the engine cuse it's doesn't really create boost without being under a load.

[vince harding]

It's not so much a hissing sound but like a higher pitched flapping sound that you would make with ur lips. It's weird

[nine6stroker]

Ah... I don't know what to say about that... I just offered the first thing that popped into my head. I'm sure some of the more knowledgable guys will chime in, just give it some time.

[Dasaliac03]

boost leak would be my guess. check all your pipes and boots

[vince harding]

Thanks guys I appreciate the feed back. I wouldn't think it's an exhaust leak since it only does it under a load at a higher speed

[aawlberninF350]

Could be turbo surge. Tell us something (anything!) about your truck to help diagnosis.

[vince harding]

What do u want me to tell u about the truck other than what's it's doing. And the truck doesn't lose any power when this happens

[aawlberninF350]

Thinking about that sound and the oily boots, maybe one of your valley boots is pulled off a bit and leaking at high boost. Mine started to pull off when they got too oily. Or any of the other IC boots. Plus that oil leak is worth investigating. Some oily seepage is normal due to the CCV, but other leaks happen up there. Maybe just a good cleaning with Simple Green and a hose, then watch carefully for the source of the leak.

We know you have a 99-03 7.3 cuz you posted here, but are there any mods? Good ones to know to help diagnosis would be if you have stock intake and exhaust, or if it is chipped or programmed, miles, etc. More info helps.