Hi, my x3 makes this sound when I accelerate, I made a video please watch it and let me know what you think it might be;
I already changed flex disk, drive shaft center support mount, new oil in differentials, new oil in transfer case.
Car still vibrates at over 60km/h and still has rear knocking sound.
Thanks!
Last edited by kosmos3d; 02-26-2018 at 02:43 AM. Reason: added slow motion to video
That sure sounds like a backfire/misfire problem,
caused by the sudden & hard acceleration,
with the popping/knocking sound being emitted by the rear muffler.
This may be just me, but l would definitely check sparkplug conditions and gaps,
if showing wear or age-Replace, along with a diagnostic scan for good measure.
Thanks for the reply! I am not sure it sounds like backfire, to me the sound is more mechanical sound, like gear hitting other gear or metal, maybe wheel bearing/hub, or cv joint is my guess.. or differential needs to be rebuild or transfer case belt is loose..
in snow and ice when the wheel is slipping and i apply enough gas it makes even more knocking
Loose or broken suspension piece or exhaust bracket. Get it up on a lift and look at it.
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