For the past month I have heard a resonant groaning noise from my rear wheel while driving on the highway. The noise stopped anytime I changed lanes but resumed right afterwards.
I started on the left wheel and spun it but I really needed to get to the hub.
Step 1: The Left Hub.
Spinning it freely and pulling pushing it, I found no issues. I reinstated the wheel and went to the other side.
Step 2: The Right Hub.
This hub has a play when I pulled pushed on it. I needed to access the hub spindle nut to fix this issue.
Step 3: The Fix!
Using my torque meter, at a value of 181Nm as per the Honda civic 1999 manual, I torqued the nut. It was clearly slack. I staved the spindle nut and reinstalled the wheel.
A test drive proved pleasurable. No groaning noise!