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I've got a 2007 civic EX with 52000me miles bought in april this year and all of a sudden in the morning when the wife starts her car it has a heavy vibration. After a while the vibration isn't so bad but is still there in reverse to when she goes to drive it stops its still there real lightly...........from my experience if its mechanical, sensors or what have u ...check engine comes on.....NOTHING! So then I go to motor mounts....all good!.......what is the problem can someone please help!

 
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I would say it's the motor mount. I don't think you can tell until you lift up the bracket that connect to the rubber part. That's the same problem I got. When you first start the car cold, it will vibrate more than when it warm up.