SEABASSS03

Hey Fellas, Im trying to figure out this knocking sound on my 2000 Pontiac Firebird..It seems like it comes and goes at different RPMs mostly when im slowing down, It sounds like a loose window, but my windows are up when I hear that sound..it comes from the front passanger side and then sometimes from the rear..I try to pin point it but just cant figure it out..its not like a engine knock, its hard to explain...I want to look under the bird this weekend, but dont know where to start looking at first.

Any info will help...Its bugging me...

JD_AMG

Im betting its the exhaust hitting something or an exhaust hanger thats loose. Any other details?
Post clear pics of under the car.

miles99z28

Can you feel it when you shift or hit bumps?

SEABASSS03

Hummm maybe, im actually going saturday morning to install these chrome square exhaust tips, and while its on the lift imma have them inspect it for me to see if thres anything loose...

SEABASSS03

Shifting is real good, its not when shifting, its when im slowing down, when i go over bumps i dont hear it...its only when coming to a stop after maybe 40mph..maybe i can do a vid

SEABASSS03

Ok guys, I heard it coming to work today, so the knocking is coming for the front passanger side feet area under the dash...Do you think it can be a shock? bushing? spring?

Do you think my rim and tire is bouncing up and down when im coming to a stop?

SEABASSS03

After inspection and riding around for a couple weeks, Yes! it does sound like the exhaust, i think its coming from the muffler, or where the Cat was welded to since it was changed i 2013...something might got loose... While at muffler shop the suspension looked to be in fair condition...imma jack it up over weekend and move exhaust around and if so off to the muffler shop again.