when my car is on but not moving the steering wheel vibrates hardcore. in doing some research i read it might have to do with the ac but i dont use the ac. other people said it could be my brakes but the vibrate doesnt start when i brake it just starts when i turn my car on.

could it possibly be the engine mounts??

 

check motor mounts and check to make sure your running on all 4 cly sounds crazy but just check and make sure you dont have a miss my first civic had the same problem and i was only running on 3 cly