Droning noise when letting off gas at highway speeds

Discussion in 'General Ford Ranger Discussions' started by Anthony, Jan 14, 2020 at 7:18 PM.

  1. P. A. Schilke

    P. A. Schilke Well-Known Member

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    Hi Anthony,

    Two thoughts....possible the Blowoff Valve? An Exhaust resonance maybe

    Best,
    Phil Schilke
    Ranger Vehicle Engineering
    Ford Motor Co.. Retired
     
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  2. OP
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    Anthony

    Anthony Well-Known Member

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    Thanks for your response Phil. I don't think its the blowoff valve, because I'm almost positive it is from behind me. Exhaust resonance could definitely be it though. I just tried to go out and capture it on my phone, but it isn't loud enough to get picked up.

    Like I said, it is barely perceptible and I know how I am about stuff like this (ie. the normal person would not even notice it). If it continues to bug me or gets any worse, I'll dig deeper. At this point, a dealer wouldn't do anything about it.
     
  3. Ronbo

    Ronbo Well-Known Member

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    Maybe this is the source of your drone sound?
    images?q=tbn:ANd9GcS71_43eDn7eGCS4jDqqDiKpWlNLKLQxt5Dz0Npzm7GKF6CmizM2g&s.jpg
     
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  4. OP
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    Anthony

    Anthony Well-Known Member

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    I knew it!
     
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  5. IdriveG5

    IdriveG5 Well-Known Member

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    If I have the radio off and pay attention, I believe I hear the sound you are referring to as well. Like you said happens as soon as you let off the gas.
     
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  6. OP
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    Anthony

    Anthony Well-Known Member

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    Thanks for joining in the fun! That makes me feel a little better (as in, it is most likely a normal characteristic of the vehicle).

    BTW: For me it only seems to happen when I'm cruising above 70mph+ and let off the gas.
     
  7. IdriveG5

    IdriveG5 Well-Known Member

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    I only noticed it at freeway speeds as well.
     
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  8. khyros

    khyros Well-Known Member

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    I was noticing this the other day for the first time as well. I was thinking it was emminating from the passenger front, so I was thinking wheel hub, but I know it's not always easy to trace the source of noise outside when you're inside, and I wouldn't be surprised at all to learn it was gear lash from the rear diff. I have a couple of squeaks and rattles (one in the dash that I'm really torn about asking the dealership to resolve or not... I don't really want them tearing into the dash and doing more harm than good), and was planning on showing this one to them as well, but who knows when I'll get around to that. I want to wait until it gets colder to make sure nothing else shrinks and loosens up.
     
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  9. the1mrb

    the1mrb Well-Known Member

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    Are you sure it's something mechanical? Could it be wind noise or wind buffeting? The truck isn't exactly the most aerodynamic shape, and at that speed I wouldn't be surprised if there was some weird flow or vortices going on that wouldn't necessarily be present at a slower speed. I'm not saying that's what it is, just throwing it out there as an idea.
     
  10. petulantskeptic

    petulantskeptic Active Member

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    I hear a similar sound to the one you're describing. I've thought it came from my Decked system vibrating against my truck bed, since it definitely sounds like it comes from behind me. It's like a deep thrum.
     
  11. OP
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    Anthony

    Anthony Well-Known Member

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    That's a good way of describing it. A deep thrum. (Never thought I'd ever use that in a sentence, but there ya go)
     
  12. RANGER PRIDE

    RANGER PRIDE Well-Known Member

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    I wouldn't be surprised one bit, if the common denominator ends up being the installation of the tail gate damper.
    It could conceivably have altered the balance of the truck.
    most definitely need to have two installed, one each side.
     
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  13. OP
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    Anthony

    Anthony Well-Known Member

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    Dammit, I think you are on to something there.

    After some doing a little math based on the aerodynamic qualities of the dampener and the imbalance it causes on the driver's side, I think we've got our culprit!

    main-qimg-b87748c404cb540abd86c0c17c896aca.png
     
  14. petulantskeptic

    petulantskeptic Active Member

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    I was hearing it long before I installed the tailgate damper.
     
  15. RANGER PRIDE

    RANGER PRIDE Well-Known Member

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    dude...its a joke .....
     
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