[CJ7VFR]

Check the pan that is attached to the underside of the car in the front.

Its there to cover the underside of the car, and makes it look nicer
underneith. Its also there to help some with the aerodynamics of the car.

Anyway, its attached with 4 small bolts, and it also has two small "flaps"
that are supposed to hook into the underside of the bumper cover.

Sometimes, these "flaps" are not attached properly under the car, and it
will make the front edge of the pan move up and down when the car is
moving. Also, the 4 bolts can come loose, and move around as well.

Crawl under the front of the car and do a quick inspection of the pan. You
may find that the noise can be fixed quite easily by just re-attaching it to
the car in the correct way.

Jim