Hey Ford Techs....2016 Expedition issue


Jim Oaks

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my 2016 Ford Expedition XLT 4x4 just turned 70,000 miles on my way back from visiting family in Ohio. I noticed that there is a hum in the front end. There's a little vibration that makes me think of a bad bearing, or the front 4x4 hub is engaged.

Even though the truck has 70,000 miles, I'm kind of surprised that it could have a bad wheel hub. I'm wondering if the front 4x4 hub still uses vacuum to keep it disconnected. On my trip, I hit a large chunk of rubber with the right front. I'm wondering if I could have damaged something that's causing the 4x4 hub to engage.

I haven't jacked the front end up yet to try and figure out what the problem could be. I started wondering if the 4x4 hub could be engaged, and figured I'd try to get some input before I jack it up and start looking around.
 


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alwaysFlOoReD

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Does the hum change or disappear when turning? That would suggest the hub to me.
 

85_Ranger4x4

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Dads 05 150 would buzz when the 4WD hubs were dragging. Sounds terrible.
 

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To my knowledge they are still using the IWE vacuum hub setup. Looking at pictures of the CV shafts supports this idea.

First two things to do are check and see if it changes as the wheel turns, like Floored said. If it comes and goes with slight turns of the wheel you have a bearing.

The next is to open up the hood, and back on the firewall is a vacuum control solenoid on the passenger side. Unplug it. That will lock the hubs in totally and if one is dragging it will eliminate the noise it makes.

They drag because one side looses the vacuum seal somewhere, usually a hose splits, or a seal inside the unit fails, and that side locks. The other side only gets partial vacuum and so it kinda jumps in and out, making it drag and rattle.

If that makes the noise go away look for disconnected or broken vacuum lines to the hub unit.

One other thing that is often overlooked by those who are inexperienced with these setups is that your wheel bearing has a pilot bearing in it for the CV shaft. THAT bearing can fail and cause a huge range of noises from a barely audible squeak to a growl just as if the main bearing was bad. I have taken over a lot of NVH jobs from junior techs who were stumped because they thought it was a wheel bearing, but couldn't find any signs of one being bad, but weren't checking that pilot and it was the problem.
 

bobbywalter

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My credo
it is easier to fix and understand than "her"
seen boot clamps squeek. figured it out after it broke... on a blazer.


are you sure its not a tire? when was the last rotation? before you left?
 

Jim Oaks

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Tires were rotated at the last oil change around 5,000 miles. It's due.
 


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