Hey everyone, just gave my car a good run up and down my road and finally managed to get it to let me catch this noise on video. It doesn’t always do it and I have yet after years of driving it been able to find out what it is because when I want to check it out...it won’t do it!! I have a video I’ll post but I’ll describe it. When sitting in the car you can hear it, it sounds like a knock coming from behind the radio area/bell housing area of the tunnel. With the car in park or neutral, you can hear it and it is steady with the rpm. So when it’s idle, it’s slow and when you rev the engine it speeds up. When you put the car in gear, it goes away completely forward and reverse even when you give a little rev. From the outside of the car (i don’t have any means of lifting it at the moment) just sticking my head under the car I can very faintly hear it if I go under right around where the mirrors are. Cannot hear it at all in the engine bay. In all honesty it sounds like if there was no bell housing is sounds like something riding around the flywheel/input shaft and slapping the tunnel! Any ideas/diagnostic steps would be greatly appreciated!
Video:

 

Need to get under there and check those torque converter bolts, and look at them close for marks that indicate the heads might be hitting the back of the block, close tolerance there.

 

 

Based on your description, you're looking at either loose flex plate-to crank bolts, loose torque-convertor-to flex plate bolts, or possibly a cracked flex plate.