On my 2008 E350 4matic it started making a pop/knocking noise on the front drivers side suspension. I have 120k on her now.

It only really does it when I back out of my driveway and begin to turn. No noises on acceleration or turning including when the weight shifts -- it seems to do it at low speed when I reverse out of the driveway and am slowing down to put it in drive.

I replaced the lower ball joint and lower control arm about 10k ago...
Sway bar? Upper ball joint? Steering tie rod? Axle shaft? How can I figure it out when there is nothing visually obvious and all bolts are tight?

since I can't find anything obvious I don't know really the best way to figure out which part is making the noise.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k