2013 G37x, 53k mi.

When stopped with the car in drive there is a minor vibration that can be felt in the seat and steering wheel. With the AC on it's worse and can rattle the quarters in my center console. RPM's are stable and the vibration gets better if you shift the car into neutral.

The car didn't always feel like this and my mothers EX35 doesn't feel like this, so it's not "normal"

Any ideas?

 

Check for loose bolts on the A/C compressor brackets. Could also be a bad motor mount.

 

I was thinking motor mount, but the engine doesn't flop around like you'd expect with a busted motor mount

 

I suspect they're fluid-filled and maybe one ruptured.

 

So, not like the old rubber motor mounts where failure means your engine becomes detached from the frame, they just fail to attenuate the vibrations as well?

 

Correct. The differential bushing is fluid-filled and failure there is fairly common. Fluid-filled motor mounts have been fairly standard for a decade.

 

Had a similar problem.

https://www.myg37.com/forums/g37-sed...or-review.html

Check out the drive shaft section. It def caused vibration and after the fix, it went away. You can just crawl under car with a light to see if that same spot is torn where mine was

 

Mine does something kind of bizarre I get a rattle sound only when stopped at a light in D or DS that's when my RPM's are at 500, as soon as I put it in Neutral or Park it goes away because my RPM's go to about 600. Or even if I slightly rev it in D with my foot on the brake over 500rpm it goes away. Any thoughts?

 

that's pretty much what is happening with mine

 

Heat shield?

 

Same problem. I think i noticed it after removing oem cats i feel it under feet on door panel and steering wheel

 

Alright, just had my inspection, told them about the vibration, they checked the motor mounts and said it was in spec. Also, i'm apparently the only person who feels it (it is very minor).

Could dirty throttle bodies be the culprit?

 

Happens on my coupe when in drive but with brakes down or going in reverse. It's fine in park and N. Sometimes it faint while other times it's a lot. When I do turn on my AC it does vibrate even more. Hopefully it's not my AC compressor and Motor mounts or that would be expensive...

 

how many miles? Ever clean the throttle bodies?

 

Did you ever solved the issue, This is happening to me 100%exactly to what you are describing.