Russ
Member
The system is not “delicate”. The issue occurring in this video is the result of partial engagement due to a vacuum leak and has nothing to do with the torque capacity of the IWEs themselves. The fact that the dealer cannot repair a simple vacuum actuated system is pathetic.
Ford released TSB 20-2013 to assist dealers with diagnosing the exact issue you’re experiencing - an intermittent grinding noise from the front wheels while driving. It specifies model years 2013-2018, but the system on 2019 models is the same aside from a revised strategy in the calibration. The dealer cannot claim the TSB on the RO for warranty, but the diagnostics still apply.
The workshop manual also contains a pinpoint test for this exact issue. It’s pinpoint test F in section 308-07A. It’s very comprehensive and even includes photos of the procedures.
I would recommend contacting Ford corporate and advise them that your dealer has attempted to repair the concern 4 times without resolution. The customer relationship rep can reach out to other dealers in your area and find one that is willing to help. They typically know which dealers have high customer satisfaction and which to avoid. Often they can even schedule the appointment for you.
Let us know how it goes.
Thanks for the great detailed response. I just dropped off the truck a few minutes ago. I'll follow up on this thread.