I've done suspensions on a bunch of cars but funny enough not our 1's. So this suggestion might not make any sense...
I had a persistent knock on an Eclipse that turned out to be the nut on the top of the strut shaft. I'd tightened it down, but - it wasn't threaded far enough from the factory. So where it met torque specs, it wasn't "tight" exactly as far as holding it to the car. It simply was that the nut had bottomed out on the threads that were available to it. Maybe there's a nut or bolt a little loose somewhere? Something that seems good but actually isn't?
I wonder if there's a way to find loose parts - maybe whack stuff with a plastic mallet and see if they move?
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