School me on IWE's
10-23-2018, 12:53 PM
#42
Yeah - similar symptoms here. Also, I had previously changed the check valve, super easy to do.
I'll update later today if the dealer gets my front diff rebuilt. I'm hoping that the consistent humming/whirring goes away after that.
I'm just concerned that i've got a bad IWE as well. Still doesn't seem like a bad diff would cause the front driveshaft and drivers side axle shaft to turn when in 2wd. The entire front driveline should be disconnected when in 2wd. Front driveshaft not being powered by the transfer case, and front wheels disconnected from the axle shafts by the IWE's.
I'll update later today if the dealer gets my front diff rebuilt. I'm hoping that the consistent humming/whirring goes away after that.
I'm just concerned that i've got a bad IWE as well. Still doesn't seem like a bad diff would cause the front driveshaft and drivers side axle shaft to turn when in 2wd. The entire front driveline should be disconnected when in 2wd. Front driveshaft not being powered by the transfer case, and front wheels disconnected from the axle shafts by the IWE's.
10-23-2018, 05:24 PM
#43
Wasn't that @acdii that had that happen? He had all kinds of fun with that last truck.
After that nightmare I am back to driving a RWD truck again, F! 4WD.
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johnday in BFE (10-23-2018)
10-23-2018, 06:50 PM
#44
Senior Member
2wd aint going to cut it for me up here in Vermont. Gotta get this figured out.
No parts in today, try again tomorrow.
I did speak to a different service advisor who agrees with my concern that one or both IWE's must be engaging. Said he'd speak to my service advisor tomorrow.
No parts in today, try again tomorrow.
I did speak to a different service advisor who agrees with my concern that one or both IWE's must be engaging. Said he'd speak to my service advisor tomorrow.
10-23-2018, 07:30 PM
#45
What someone would need to do on a known properly working system is to put a camera pointed at one of the half shafts, go for a drive and then see if they see a noticeable increase in spin (assuming it is turning) when switching to 4wd. If so, then we’d know if they still get spun some what even when not engaged.
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Blue2016XL (10-23-2018)
10-23-2018, 08:45 PM
#46
Ask and you shall receive. I am the OP, and had the concerns myself. Its interesting, I mounted a GoPro to my frame and shot this video with a crappy watermark because I don't edit video often. You can see that when I'm backing out of the garage, the half shaft does stop turning. While driving forward it appears to spin the same regardless of the selected mode. I can see that there would probably be some static friction in the hubs, but hard to say because they appear to really rotate the same forward as the tires. This was drivers side only. I guess the fact that the shaft stops turning altogether while the tire is still rotating tells me that both are disengaging (I would expect the shaft to still turn by nature of the other side tire if one was engaged or not). Either way, its a goofy system, would be nice to have total disengagement as this is always turning the differential.
10-23-2018, 08:48 PM
#47
Yeah it is hard to tell if it is/isn't spinning as fast as the wheel. I have to ask. How cold was it when you shot the video? Reason is that it is said that the system does keep the IWEs engaged to warm them up. Not sure what model year they started that but, if true, I believe yours is new enough. Maybe try it again say after you have driven it for awhile to see if you get the same results. If you have the time that is and assuming that this was the first time you drove the truck that day.
10-23-2018, 08:57 PM
#48
You forget about the lubrication in the front diff also. Someone in one of the many posts of IWE noise posted the tech. info on it that says that the system will do that. Warmed up lubrication, lubricates better when warm.
10-24-2018, 06:34 PM
#49
Senior Member
Parts came in today, but expecting work will take 2 days to complete, so maybe I'll get it back tomorrow.
I once again expressed my concerns that something in the vacuum system is acting up and asked my service advisor if an IWE locked up on one side, could it cause the failure they observed in the diff... he thought that was an interesting question.
That said, I had a chance to grab a quick video of my friends 2017 Platinum. In 2wd mode, the drivers side front half-shaft did not turn while driving slowly forward, right after startup. Maybe 45F out?
Seems like this fits my understanding of how the system is supposed to work, though maybe there is some level of drag that would cause the front half-shafts to spin when in 2wd mode.
I once again expressed my concerns that something in the vacuum system is acting up and asked my service advisor if an IWE locked up on one side, could it cause the failure they observed in the diff... he thought that was an interesting question.
That said, I had a chance to grab a quick video of my friends 2017 Platinum. In 2wd mode, the drivers side front half-shaft did not turn while driving slowly forward, right after startup. Maybe 45F out?
Seems like this fits my understanding of how the system is supposed to work, though maybe there is some level of drag that would cause the front half-shafts to spin when in 2wd mode.
10-24-2018, 07:20 PM
#50
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Parts came in today, but expecting work will take 2 days to complete, so maybe I'll get it back tomorrow.
I once again expressed my concerns that something in the vacuum system is acting up and asked my service advisor if an IWE locked up on one side, could it cause the failure they observed in the diff... he thought that was an interesting question.
That said, I had a chance to grab a quick video of my friends 2017 Platinum. In 2wd mode, the drivers side front half-shaft did not turn while driving slowly forward, right after startup. Maybe 45F out?
Seems like this fits my understanding of how the system is supposed to work, though maybe there is some level of drag that would cause the front half-shafts to spin when in 2wd mode.
I once again expressed my concerns that something in the vacuum system is acting up and asked my service advisor if an IWE locked up on one side, could it cause the failure they observed in the diff... he thought that was an interesting question.
That said, I had a chance to grab a quick video of my friends 2017 Platinum. In 2wd mode, the drivers side front half-shaft did not turn while driving slowly forward, right after startup. Maybe 45F out?
Seems like this fits my understanding of how the system is supposed to work, though maybe there is some level of drag that would cause the front half-shafts to spin when in 2wd mode.
As far as an unlocked IWE doing that, the only thing you'd have is windage, not saying that it wouldn't turn the shaft, theoretically. But I can't imagine in real life that the air in the hub could come up with that much friction.