DK in NC

Yesterday on the way home, my 2018 made a noise a couple of times that sounded somewhat like something was caught under the vehicle and being dragged, but only lasted about 2 seconds each time. Did it again this morning but sounded more like it was coming from the front driver's side wheel, but I can't say that for sure. Each time was at speed on the interstate. It also did it just briefly as I made a turn this morning. The noise does not sound or feel like grinding and it's not during braking. Truck is in 2WD and I've used my 4A only about 4-5 times in the year I've had it and had no issues. My first guess is something to do with the IWE, but I'm not familiar with what that sound usually is. I know it's difficult to give a guess without hearing it, but wondering if anyone else had a similar impression of this type of sound from their truck. Any suggestions?

Joe F

Hey neighbor,

I remembered seeing this video when I was trying to diagnose my problem. Dunno if this is what yours sounds like, but just in case. According to various comments it was possibly a failing IWE. Down further in the comments however, he posted this as the fix: "Service replaced vacuum reservoir/check valve PN FL3Z-7A784-A."

DK in NC

Thanks Joe! That's exactly the sound I hear.

Joe F

Cool! Hopefully we are even now on me skipping Trail Work Day last Saturday!

MR G

My 2018 XLT RWD made the exact same sound continuously for about 5 or 7 minutes only when the truck was moving a few weeks ago. I got out twice and looked everywhere under the the truck. It was hard to diagnose by myself, since I could not drive it and be outside the truck at the same time. I was late for an appointment and kept driving. All of a sudden it stopped and I figured something was dragging on the driveshaft and fell off. I turned the truck around and drove up and down the street where the sound stopped looking for anything that fell off. But I could not find anything.

It sounded like a heat shield was sitting on the driveshaft, because the sound got louder the faster I drove. At first I thought it was a loose brake pad or something in the front of the truck, but the sound did not get louder when the brakes were applied. I crawled under the truck after my appointment thinking I would find marks on the driveshaft or a missing heat shield. No marks, nothing missing, nor was anything hot to the touch in the front or rear wheel bearings/suspension/drive lines.. This was a few weeks ago and after another 1000 or so miles, the sound has not come back. I figured that maybe something metal had gotten stuck under the truck while driving on the freeway and it finally came out. I almost had forgotten about until I saw this post and the sound was exactly the same that I heard. But I do not have 4WD.

Anyone?

There was no performance loss or any type of binding feeling when driving, so I chalked it up to something I picked up on the freeway.

Blue2016XL

If it is the IWE it should go away when you switch to 4WD the noise should go away unless it is the IWE themselves. Easy things to check:

1. Check valve. If you can blow through it both directions, it's bad. Can be replaced easily and costs around $10. Should note that the check valve has been known to work intermittently.

2. Check the vacuum lines and connections for cracks or holes. Pay special attention to connector that connects the rubber line from the IWEs to the plastic lines.

3. See if you can hear the solenoid switch when you have someone switch from 2WD to 4WD and back. This can be replaced anywhere from $25 to $55 depending on where you get it from.

Other things that have caused this and are more expensive are the IWEs themselves, transfer case and the front diff. TC and front diff rarely but, have been reported.

Threeper88

MR G

Even in my case with RWD and no 4WD?

Threeper88

MR G

Ya, it was weird, but I guess I will chalk it up to being something got stuck under there somewhere on the freeway and worked itself loose.

Thanks!