There is a tool you might be able to borrow or rent from an auto parts store that borrows them called the "Chassis Ear". It is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points, then drive around while listening with the headphones. You can move the microphones around to zero in on the source of the noise. Be aware that many mechanics have never seen or even heard of this tool. Suspension and alignment mechanics use it to find rattles, squeaks, and other noises.
Identifying the side by turning a little, as in changing lanes, always worked on the older pressed-in bearings on Chrysler products in the '80s, but when they went to the bolt-on assembly like GM uses that trick could not be counted on. On most of the models by the early '90s the sound did not change when turning slightly, and when it sounded like the noise was coming from a certain side, I was wrong 50 percent of the time because noise travels and can be misleading. The only sure-fire way I ever found was to run the car on a hoist and listen next to each bearing with a stethoscope. One would sound a little rough, but then the bad one would be MUCH louder. Harbor Freight Tools and most auto parts stores have stethoscopes for less than ten bucks.
Some people say you can feel the bad one if you hold your fingertips on the spring while you rotate the tire by hand. I've never tried that myself.
Friday, February 15th, 2013 AT 8:30 PM