Hi guys - new member.
I just bought a new 2012 JK Rubicon 2dr auto. 500 miles so far. It's great - such improvements over the years. I've owned OG renegades as well as a sport back in 1995.
One odd thing that I noticed was when accelerating out of my neighborhood (low gear, higher rpm starts) I get a whine or higher pitch gear-growl not unlike the sound of a ducati motorcycle. After 3-4 minutes of normal driving that effect is gone. If I pull up to a red light, when it turns green and I take off the effect is no longer there like it was when I pulled out of my street. It seems to go away when the jeep warms up.
If I park for 30-40 minutes it will happen again upon take-off. It's at about 2500 RPM give or take. Seems like a cool car symptom. I actually first though it was in the tranny (like dry gears) but I think it's exhaust or exhaust manifold.
My question is "Is this normal - or has anyone seen this?". I went to the dealer to test a new car but their only auto was a JKU and it didn't demonstrate the same problem at all.
I have an appt set up for monday but the service guy hear it and said "it could just be the nature of YOUR rubicon, but I do hear it" (odd comment)