2013 F-150 3.5L ecoboost hissing under mild acceleration

2013 F-150 3.5L ecoboost hissing under mild acceleration

This is a discussion on 2013 F-150 3.5L ecoboost hissing under mild acceleration within the F150 Ecoboost Problems forums, part of the F150 Ecoboost Forum category; My F-150 3.5L eco now has 51,000 miles on it. I donít know if itís something I just never noticed before since I bought this ...

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Thread: 2013 F-150 3.5L ecoboost hissing under mild acceleration

  1. #1
    Rookie Slbynum's Avatar

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    2013 F-150 3.5L ecoboost hissing under mild acceleration

    My F-150 3.5L eco now has 51,000 miles on it. I donít know if itís something I just never noticed before since I bought this truck used at 43000 miles but I have a slight hissing noise that only occurs under very mild acceleration. Cruising around 35 or 45 miles an hour if I give it just the slightest amount of acceleration I hear this hissing noise but if I continue my acceleration the hissing noise goes away as I accelerate more beyond mild acceleration. Itís not super loud inside the cab and I canít hear it with the window down with all the wind noise or if the radio is on. Any idea what this could be?

    Steve

  2. #2
    Ecoboost Veteran Mikedick77's Avatar

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    Might pop off your blow off valve from the intercooler and take a look at the orange diaphragm inside the valve. I had this issue, and replacing that part fixed it, and also netted me a little bump in everyday performance.
    snakebitten likes this.
    2013 Eco XTR 4x4 Super Crew 5.5 bed 3:31 Rear
    Stock, Weep hole, 160 degree T-Stat, Autolite Iridium XP5863 gapped properly, Castrol Magnatec 5w-30, and 93 octane
    NO OIL LEAKS!!

    Purrs like a kitten! It's called maintenence. This shouldn't surprise people.

  3. #3
    Rookie Slbynum's Avatar

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    Well I finally got it down to the Ford dealer and left it with them and they said the noise was normal. When I went down to pick it up I had him drive with me and he heard the slight hissing noise which goes away when I accelerate further and he said it was normal.

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    Ecoboost Pro DNA Dan's Avatar

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    I believe that's called BOOST!!
    2012 SCREW Eco FX4 Tuxedo Black, Fully loaded, Max Tow, 3.73 rear.
    ARE Z-Series topper w/Yakima rack, Bilstein 5100's, StopTech Sport brakes, BFG T/A KO2 on stock rims, RXP Catch can w/UPR check valves, FR Gen 2 Radiator, Saudi Trans cooler, CR Performance Engineering exhaust manifolds, Firestone Air bags.

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    Ecoboost Veteran Mikedick77's Avatar

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    I've heard the same in mine before I fixed the BoV. It went away. Sounds like a stream of air hitting the pavement, right? It's not a noise i'd think was normal. Especially when it went away after my repair. Might be something to ponder.
    2013 Eco XTR 4x4 Super Crew 5.5 bed 3:31 Rear
    Stock, Weep hole, 160 degree T-Stat, Autolite Iridium XP5863 gapped properly, Castrol Magnatec 5w-30, and 93 octane
    NO OIL LEAKS!!

    Purrs like a kitten! It's called maintenence. This shouldn't surprise people.

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