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.

Answered by caradiodoc (expert)
17,280 answers provided

We are not able to determine where the noise is coming from if you can't locate it, you can try renting a "chassis ear" whereby microphones are installed close to suspected areas and going for a test drive to locate the source of the noise.

Where metal to metal noises are concerned, it should not be too difficult to detect. A visual inspection is mostly all you require. When bushes are worn, tell tale signs are abrasion and rust marks. Some shaking with your hands to suspected control arms etc should allow you to see something. A screwdriver would allow you to for excessive bush wears with some prying.

Answered by KHLow2008 (expert)
39,869 answers provided