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My 15 ecoboost is making a pronounced vacuum sound when idling cold and during acceleration. No check engine lights, nothing seems loose that I can tell. the vacuum noise I refer to is like a humming, the same humming you would hear from a vacuum cleaner,it mostly sounds like that at cold idle. I don't think i notice any power loss. what could it be? any experience with this noise. The car has a cold air intake FYI.
 

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Not sure to be honest. I know my wife's Ecoboost makes a heck of a vacuum sound when I first start it up for the day. It has a JLT CAI installed and for the first 20-30 seconds after you cold start the car it sounds like it could suck up a tree! The sound goes away for the most part after 20-30 seconds though.


U.M.
 

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