I've got an 2006 G35 Coupe with a/t, only 4,500 miles.
On a cold start, I hear a strange grinding noise that lasts for approximately three seconds and occurs prior to the car shifting from
1st into 2nd gear. This is the only time that I hear it; after the car gets warm, it doesn't occur again, even when coming to a complete stop. However, if I stop the engine for a few minutes, it will make the noise again.Also, when traveling 45+ mph, I hear a strange humming noise and I can feel vibrations, that seem to be coming from the wheels/brakes. Dealer has said that the brakes appear "fine" ... any clues?
Thanks!
-John