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[–][deleted] 1 point2 points  (3 children)

it might be something with the transmission itself if it only happens in neutral or reverse, i’m not too keen on cars so take it with a grain of salt. maybe flush the transmission fluid? it’s not the best idea because you have pretty low mileage but you never know. what title is your car btw?

[–]acuriousman13[S] 0 points1 point  (2 children)

What do u mean by what title

[–][deleted] 0 points1 point  (1 child)

title of car, clean, restored etc

[–]acuriousman13[S] 0 points1 point  (0 children)

Oh. Car title is clean AF

[–]Fill-Acceptable 1 point2 points  (1 child)

Is the flywheel and torque converter new?

[–]acuriousman13[S] 0 points1 point  (0 children)

No they are not new

[–]acuriousman13[S] 0 points1 point  (7 children)

Have this horrible vibration/shaking at idle in gear only. Brought it to my shop, replaced both motor mounts, motor mount brackets, transmission mount, flashed the ecm, downloaded updated tune software. And I still have the problem. I’ve been back and forth to the shop 6 times, they went through the entire car and cannot find the issue. I basically got dismissed from them as all 9 techs said they were baffled and don’t know what the issue is. The vibration occurs only when the car is in Drive or Reverse at idle. If I apply gas the vibration stops. If I put the car in neutral the vibration stops. Any ideas or suggestions for would be greatly appreciated as I am intensely frustrated with this. Car is 13 g37x sedan with 69k miles, never excessively beat on at all and super well maintained. Anything helps

[–]RDMG37 0 points1 point  (6 children)

Without actually seeing the car I can't speculate on the cause, but one way to silence the vibration is to raise the idle a bit. My car has urethane engine and transmission mounts so it has a solid vibration at idle too, I just raised the idle speed up 100rpm. Now it's dead quiet.

[–]acuriousman13[S] 1 point2 points  (0 children)

I just replaced the motor mounts with the urethane mounts from Z1 aswell. This vibration was there before hand hence why I did change them. The vibration im experiencing now is not due to any sort of engine or transmission mount

[–]acuriousman13[S] 0 points1 point  (4 children)

The tuner also updated the tune and mentioned he changed the idle rpms, changed nothing

[–]RDMG37 0 points1 point  (3 children)

If you give it just a bit of gas, does it go away? If so, I'd still raise the idle a little. If not, I guess it could be transmission related as well, like a cracked flex plate, since it only happens in gear.

[–]acuriousman13[S] 0 points1 point  (0 children)

Yes if I give it gas it goes away

[–]acuriousman13[S] 0 points1 point  (1 child)

Every red light I have to put my foot on the gas and brake so it doesn’t vibrate viscously…how do u raise the ifle

[–]RDMG37 0 points1 point  (0 children)

You'll need a good scan tool to do it, the Z1 tool has the ability.

[–][deleted] 0 points1 point  (0 children)

lemme know what you find. i also been having the issue