pintokid Posted November 28, 2022 Report Share Posted November 28, 2022 I was riding with my wife driving today and I noticed a kind of "roar" coming from the rear end under hard acceleration. I know that is the only time on a dry road that the AWD activates power to the rear. As soon as she backed off, the sound was gone. It is definitely in the rear, not where the PTU is located, and only under acceleration. Has anyone seen this before. We have about 62K on the 2017 Edge and PTU was replaced at 10K and no other transmission fluids have been changed. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted November 29, 2022 Report Share Posted November 29, 2022 Either the rear differential or rear wheel bearing. Both create a roaring noise on acceleration, but the differential will also create a roaring under additional load. The differential could be failing if its leaking, running low on lubrication, or you drove through deep water at some point, allowing water to enter the axle, causing lubrication failure. Another possibility is the car was subjected to a towing overload at some point. One method to isolate between the two, would be to lift the rear end and shake to rear wheels. Also rotate the tires while listening to the bearings. An old mechanics trick is to use a long, wood handle (plastic works as well), the slot end on the area of the bearing with your ear on the handle end. Listen for grinding. In either case, something is wearing out in the rear. Have you ever changed the rear differential fluid? Best to do this every 60,000 miles or any time the car has been driven through deep water (level over the rear axle). It's in the cars maintenance manual (at least in mine for my MKX). Quote Link to comment Share on other sites More sharing options...
pintokid Posted November 29, 2022 Author Report Share Posted November 29, 2022 The car has 62K now and needed a front wheel bearing at about 10K. Thanks for the advice. The car has had an easy life. Only light towing last year a few times. Never been through deep water. The car needs to be back at the dealer for a recall, so I think I'll get them to change all the fluids (except engine oil). Quote Link to comment Share on other sites More sharing options...
pintokid Posted December 9, 2022 Author Report Share Posted December 9, 2022 The dealer tells me it needs a new PTU. $3200. Not a surprise actually but still disappointing. This will be the 3rd PTU in this car. Quote Link to comment Share on other sites More sharing options...
pintokid Posted December 19, 2022 Author Report Share Posted December 19, 2022 I complained about the cost to the service rep and he gave me the phone number to complain to Ford. They were polite but very quickly replied they could not help. I assume because this is not a pervasive failure in the Edge. Oh well. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.