Am I hearing things??? - Ford Powerstroke Diesel Forum
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Old 05-07-2012, 06:16 PM Fanatic

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Am I hearing things???

So I did my EGR Delete and Oil Cooler R/R last week. The truck is running great, lots of power, no leaks spotting the driveway!!

....but. At idle and mostly in the morning when cold it sounds like to me I have an air leak...kinda of a hissing sound. It is louder when VGT% is around 76-77% at idle and cannot be heard when the VGT% is down in the mid 60's or below. I have checked both my up/down pipes and from what I can see with out breaking the wrenches out again they look sealed. (Also I have no exhaust smell from the cab) I also have checked all the CAC boots. Anything else to check?? Could there be a little more "air" noise now since "all" the exhaust is going back to the Turbo? I also am running a Tune for the first time (Econ Only from Quick Tricks)...could that make a difference in sound?

I am pulling the camper for the first time since doing the work in two weeks, would like to figure this out before then or just feel a little more confident before I guess I am going to tear it all apart as it is kinda driving me crazy. Am I just worrying about nothing??

Last edited by Face Down; 05-07-2012 at 06:24 PM.
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Old 05-07-2012, 06:26 PM
Powerstroke Techie


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Check the flex joints on the y-pipe. It's the accordion looking thing.

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