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Thread: Under hood noise

  1. #1
    SoCAPS Member King Ranch's Avatar
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    Under hood noise

    Wow never any new posts for 2011+ Powerstroke. Well I think I have a problem. When my truck is idling - a very loud humming/buzzing noise (for lack of a better description) is generated from under the hood. I can't pinpoint its origin. It is very disturbing and wondering if any other 2011 owners have a similar problem? I plan to bring it in I just haven't had the time yet this Christmas season.
    New - 2011 F250 CC PSD SWB Lariat FX4 Oxford White/ Pale Adobe Interior
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  2. #2
    SoCAPS Member MSDSMAN's Avatar
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    Moreno Valley
    I have heard the noise before after a cold start, I shut off the engine and restarted twice and it went away. This has occured two other times, but it always went away. You might also want to check out "The Diesel Stop" 2011 forum to see if anyone has had this issue, there are alot more users on that site.Keep us posted on what they find out.
    <font color="navy">Ken</font><br>
    2011 F350 XLT CC 6.7 PSD 4X4 BAJA Limo IV<br>
    Oxford White, BFGs, E-Locker, Steel &amp; Black Interior, Sync Equipped, Integrated 5th Wheel Tow Package, Icon Coil Springs &amp; Shocks, Firestone Airbags, FUEL Off Road Throttle Wheels, BFG All Terrain Tires, N-Fab Nerf Bar Steps, Line-X Spray in Bed Liner,Aries Brush Guard. Just getting started.<br>
    (SOLD)2006 F350 XLT CC 6.0 PSD FX4 BAJA Limo III<br>
    Metalic Silver, 2-1/2" Donahoe Racing Leveling Kit, 35" BFG A/Ts Black Moto Metal 957s Nerf Bar Steps, Light Bar W/ Hella 500s &amp; KC 130W DayLighters, Spray in Bedliner, 5th Wheel 33ft Extreme RV Toyhauler JSC Sandrail<br>
    61000Mi Ran like new.<br>
    (SOLD) 2005 F350 XLT CC 6.0 PSD FX4 "New Baja Limo" DK Grey, Dual Alternators, MBRP Exhaust System, Nerf Bar Steps, Rhino Lined Bed, 5th Wheel 33ft Extreme RV Toyhauler JSC Sandrail <br>
    36500 Mi.......... Ran Like New<br>
    (SOLD)1996 F-350 CC 7.3 PSD 4X4 Baja Limo,Oxford White Banks Chip &amp; Trans Command-Triple Disk Torque Converter 4:10s <br>
    Down Pipe-Deleted Cat- Open Element Intake-Rancho 9000s 5th Wheel 33ft Extreme Toyhauler JSC Sandrail 208000mi........Still ran like new<br>
    <font color="#000080"></font>

  3. #3
    SoCAPS Member
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    Big Bear City
    Mine does it also. Mine goes away after it warms up. Look under the carrage and it should be coming from the cat / regen chamber. The truck likes to sing to you.

  4. #4
    SoCAPS Member Bio-Daddy's Avatar
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    My father has the same buzz/humming noise after he turns off the engine... it lasts a few min then goes away? we are curious wtf is going on, the truck just started doing this a few weeks ago but it has 15k on the odometer already
    01 F250 XLT c.c. s.b. 7.3, Dp tuner(8 tunes), Edge attitude monitor (for gauges) billet grill,billet badges, International bellowed uppies, home built 4" dual exhaust with 2/5" tips,muff delete, Airaid intake, 44 gal tank, trans gauge, Mag hytec diff covers and deep trans sump, John Wood trans, 6.0 cooler, billet converter, GOS headlight harness, DC 190 amp alt., 5" Deavers, 3" hangers, 37" tires w/17" welds, Fox shocks w/resiviors, EBC slotted rotors, air bags, onboard tank/compressor, Klienn Train Horn, gooseneck hitch, runnin' home made bio-diesel, 235,000 mi. & still strokin strong!!

    2006 -4 seat Chenowth Explorer,home built, powered by an Esslinger 2.3 turbo Ford motor, T3/T4 @20psi =family fun!!

  5. #5
    SoCAPS Member MJ351's Avatar
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    Mine has done it since day one, was told by a Ford tech that it is normal, just like the occasional beep.
    2008 F 350 Super Duty Harley #0054 (Sold)
    2007 F 350 Super Duty Harley #1315 (Sold)
    2005 F 350 Super Duty Harley #3134 (Sold)
    1995 F 150 Lightning # 1679 (Sold)
    1995 F 150 Lightning

  6. #6
    Event Coordinator Samuel1941's Avatar
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    Probably DEF pump returning unused fluid to the tank.

    Reducant Pump
    The reductant pump supplies urea to the dosing module. One unique function of the pump is that when the ignition is turned off, the pump pulls all of the reductant out of the lines. This prevents damage to the lines if the reductant were to freeze.

    The DEF tank has heater that will thaw out the DEF if it happens to freeze. If it remains in the lines and freezes, you have a much longer term problem. Truck is designed to operate for short periods when DEF is frozen and waiting for in tank heater to thaw DEF. But their are no heaters built in to thaw the supply lines from tank.

    Obviously not a concern for us here in Southern California, but a feature built into the system.

    Also, excess fuel is also routed back to the fuel tank, through the fuel cooler and thermal recirculation valve. So the noise could also be coming from this equipment.

    2012 F350 PSD Lariet SuperCab 2X2, long bed, TriPlatinum White, all the extras
    (Bobby Williams Sale...Sunrise Ford Fontana Great Deal...Thanks)

    (Traded In) 2005 F350 PSD Lariet Supercab Duallie, auto, 4.10, all the extras. (Bobby Williams Sale) Anti-Gremlin Bell hanging off front suspension, Putco Boss 4" S/S nerf bars, Velvet Ride shackles, Bull Ring tie downs, C-Btr Mirrors, muffler delete, aftermarket intake elbow.

    (Sold) 2000 F350 PSD XLT Supercab Duallie

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