Humming/roaring noise from the front end

Denver102 · Jul 12, 2022

Hello, I have a 2006 expedition. Ive been chasing this problem now approximately 10 days. So I started hearing this humming noise coming from the left front tire (I think), so I thought it may have been wheel bearings. I went ahead and replaced both sides. The noise is still there. I changed both of the hub actuators. The noise is still there. I rotated all 4 tires/wheels. The noise is still there . I bought and installed 2 cv axles. The noise is still there. I removed the the new cv axles and the front drive shaft. The noise is still there. I know it does not need alignment. I can hard brake and it stays straight as an arrow. I have practically 4 new Michelin Defenders. Bought to pull my hair out! Any Help will be greatly appreciated. Thank you for reading.

whtbronco · Jul 12, 2022

All I can think of is tire noise. I have thought several times over the years I had wheel bearings going out, but it was just tire noise that went away or changed after another couple weeks.

whtbronco · Jul 12, 2022

You could check the alignment for free, I've never considered that if it continues straight with heavy braking it's aligned properly, maybe that's legit. With just a tape measure and maybe a block of wood you can check the alignment. A helper to hold one side is beneficial, but a 2x4 or 4x4 about 12-14" will do to hold the tape on the tire. Measure them front and back as high as you can get without bending the tape. Just find a tread block that's the same front and back to use and measure tire to tire. It's too hard to measure the sidewalls, gotta use the tread. Generally like 1/32" toe in the front is preferred for me as it allows the truck to roll very freely, but it does not track quite as well as with 1/16" toe in.

I gave up on shops for alignments decades ago with my jacked up trucks and have found I can do it on all of our vehicles. Much easier, cheaper and quicker to do it myself plus no one else touches my vehicles.

Denver102 · Jul 12, 2022

Thank you buddy for the info!!!! Means a lot!!

Hamfisted · Jul 14, 2022

With both front wheels up off the ground and the engine running ( in Park ). Spin each wheel and check that they are free spinning, with no dragging brakes or partially engaged hub. If you feel a hub engaging check for positive vacuum to the hub actuator (put a vacuum gauge on the line...). Vacuum must be supplied to the hub actuator to disengage the hub. With no vacuum, or a vacuum leak, the hub will remain engaged.

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Mr_Kostas · Jul 19, 2022

Is the noise happening during low or high speed, or both?
Did you check the transfer case if it has enough fluid?
You can check the actuators right at the solenoid on the passenger firewall (engine)
The actuator is a common issue with the expeditions due to the way was designed and not protected by the elements
I installed this Dorman 600-400 4WD Vacuum Solenoid ( Amazon)

Vincent Vega · Jul 19, 2022

Mr_Kostas said:
Is the noise happening during low or high speed, or both?
Did you check the transfer case if it has enough fluid?
You can check the actuators right at the solenoid on the passenger firewall (engine)
The actuator is a common issue with the expeditions due to the way was designed and not protected by the elements
I installed this Dorman 600-400 4WD Vacuum Solenoid ( Amazon)

Yeah same here, the humming on mine was caused by that check valve. Got a new one from Ford for like $10, which is about $9 overpriced, but it fixed it. So yeah @Denver102 you should definitely check the vacuum hosing for leaks. I have had to replace most of my underhood vac hosing over the last couple years, just in general.

Humming/roaring noise from the front end

Denver102

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whtbronco

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whtbronco

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Denver102

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Hamfisted

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Mr_Kostas

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Vincent Vega

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