On today’s episode of “name that rattle!” We have a 2003 Mercury Marauder. The owner is experiencing a rattling sound at idle, coming from directly under the car. The owner believes it sounds like the drivers side primary cat on its way out, but he wants to hear from the experts!!! Feel free to chime in!
https://youtu.be/KaGhEAcBaQA
Note that in the video, when the sound goes away is when I give it baby gas. Let off and it rattles.