I can offer two suggestions. The first is the upper strut mounts are binding. To identify that, reach over the top of a front tire and lightly wrap your fingertips over part of the coil spring. Have a helper slowly turn the steering wheel back and forth. The spring should rotate smoothly with the wheel. If the upper mount is binding, the spring will wind up and build tension, then you'll feel it snap free and rotate. This will occur when the car is standing still, and sometimes when moving slowly. At parking lot speed there is usually enough bouncing to let the mount let go and rotate freely. The second clue is these will not bind when the car is on a frame-contact hoist with the suspension hanging down. That unloads the bearings in the upper mounts and lets them rotate easily.
The second recommendation is the "Chassis Ear" Steve W. Mentioned. That is a set of six microphones, a switch box, and head phones. You clip the microphones to suspect parts, then drive around while switching between them to listen where the sound is loudest. The guys who drive the tool trucks around get around $200.00 for the original version of this tool. I found it for $99.00 on eBay. There are newer versions too. One uses four wireless microphones and two with wires. One model doesn't use head phones. I don't like that because normal road noise interferes with listening closely. Be aware most mechanics have never even seen or heard of this tool. Suspension and alignment specialists use them quite often to find the causes of squeaks and rattles.
Saturday, April 13th, 2019 AT 9:30 PM