Recent content by Aaron407

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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Final follow-up: we took it into a shop and they found the CV-type joint on the front driveshaft was broken. They replaced the driveshaft and the noise is gone.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    4A is fine to use basically all the time since it just adds spinning weight of the axles with the IWEs locked but nothing is actually being powered unless there's a loss of traction since the clutch isn't normally being applied in the transfer case. Per the manual regarding 4A: "This mode is...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    New updates in my hopes of figuring this out: I replaced the hub/bearing and IWE. Everything's back together and functioning, but the sound is still there. I also noticed that abruptly pulling off the throttle when at highway speed will usually see the sound briefly go away completely. I'm...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Latest update: I just tested both front IWEs under vacuum. They both held 16" with no issues, including when rotating the wheels. I also tested vacuum level from the system at each IWE, which came in at 26". There was no variation when cranking the wheel either. Since everything seems to be...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    I wouldn't be as concerned if it had always done this, but it was fine for the previous 155,000 miles and just started making the louder noise.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Yeah, I plan on jacking it back up and putting my hand vacuum pump on, then rotating the hub to see if it still holds vacuum properly in case the seal is bad. The lack of vacuum switching from 4wd to 2wd at full left lock is a weird thing, though. I haven't found anything online that says it...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Thanks, I'll take a look. Considering that it can be in a spot where it's "happy", or at least not making the humming noise, it really seems like a vacuum issue.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    New check valve made no difference, unfortunately.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Update: Now the humming is still there in both modes, but the tone drops slightly when I switch from 4A to 4x2. When I switch from 4x2 to 4A at speed, the humming sound briefly goes away completely, then comes back. I discovered that if I stop and turn the steering wheel full left (haven't...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Normally I would think wheel bearing when there's humming, except that it goes away in 2WD and it doesn't really vary in tone depending on speed. It's a bit more 'rough' of a sound than a consistent hum as well. When I was thinking about the IWE, I was wondering about the possibility of it not...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    I noticed on the weekend that our 2015 Navigator (same engine/drivetrain as an Expedition but a heftier price tag) had a subtle but more noticeable humming noise specifically from the front driver side wheel area when driving at highway speeds in 4A. The sound goes away completely after...
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    2015 Ecoboost - Fuel Problem

    Well, we made it home. They couldn't find anything wrong in the end, but I coordinated with a friend of mine who owns an auto repair shop in Saskatchewan and further pulled in his head technician. They don't think the dealer should have replaced the high pressure fuel pump, and that they would...
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    2015 Ecoboost - Fuel Problem

    It's currently with the dealer again, but they can't find anything wrong. I'm not sure how I can feel comfortable towing our trailer back home for 12 hours not knowing if it's going to kick out at any given moment.
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    2016 fuel pump control circuit open

    It seems to run perfectly fine until it just kicks out suddenly. It has only happened in high temperature weather, which makes me think it's a component vs. heat problem. I'll maybe ask the dealer to replace the filter since it's with them now, but the P0627 code seems to suggest an electrical...
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    2016 fuel pump control circuit open

    Bringing this thread back to life as we're currently fighting with the same thing that has decimated our family vacation. Did you ever find the problem? We had ours towed to a dealer that replaced the FPDM and high pressure fuel pump, but had the same problem in the heat about 150 miles later...
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