Faulty Exhaust noise underneath car after I take my foot off the gas

[jruss5457]

Hello Everyone,

I am hoping someone can help me. I have a 2023 Kia stinger gt line and recently have noticed a weird rattling noise under the right side passenger seat when accelerating and then taking my foot off the gas. It sounds like something related to the exhaust. I took it to my local kia and they said they couldn't replicate the sound on a test drive and then I picked it up and heard the noise immediately. I definitely here it when taking sharp turns as well. Some days it is very prominent and others I do not hear it whatsoever. Let me know if anyone has had a similar experience! I am not able to upload the video on here for some reason but can definitely send it over to anyone who can help.

 

[Thomby]

Does it happen at specific rpms during off-throttle decel, say from 2000-1000rpm, kind of like trilling your tongue against the roof of your mouth, or a card in bike spokes? And disappears if you touch the throttle at all? If so it may be wastegate rattle.

Here's an exaggerated BMW example:

Infiniti at startup (0:05-0:07):

 

[jruss5457]

I uploaded a private youtube vid. It happens twice in the vid, check it out

 

[jruss5457]

Does it happen at specific rpms during off-throttle decel, say from 2000-1000rpm, kind of like trilling your tongue against the roof of your mouth, or a card in bike spokes? And disappears if you touch the throttle at all? If so it may be wastegate rattle.

Here's an exaggerated BMW example:

Infiniti at startup (0:05-0:07):

I just uploaded a vid of it to youtube in the above post

 

[socalvn]

I may be way off here but make sure you're Underside rocker panel passenger side is snapped in to place properly or noise can travel up through the b-pillar be deceptive happened on my GT line