Hi all,
I have been experiencing the exact same condition with my G8 GT since I got it 2 months ago. The dealership has balanced, road force balanced and replaced all 4 Goodyear tires with Michelins. Still, the problem persists. The vibration in my car only seems to happen at speeds close to the programmed shifting points. Most noticeable at 60 - 70 km/hr (35 - 40 mph). No vibration at highway speeds. My Dealership has no idea how to correct the problem. They contacted the Regional Engineering Branch (here in Canada) and they had no solution so the Regional Branch has contacted the factory in Australia to see if they know of a solution. That was over 3 weeks ago and I'm still waiting.
Personally, not that I am a mechanic, but it feels like the transmission program/computer is trying to decide to shift up (or down) but isn't sure if it should and causes the transmission to vibrate. At first I put the blame on the AFM but at this point I am uncertain. If I am feeling the vibration I can put the tranny into sport mode and the vibration goes away. Sport mode has a higher (and posisbly tighter...not certain) rpm range so the shifting decision for the computer is made. The other thing is that I don't have any vibration at highway speeds while AFM is on.
I don't know about anyone else but over the last few weeks I have noticed that the vibration is occurring more frequently and is more intense. Hopefully the vibration isn't damaging the transmission.
Last edited by scott_k; 06-19-2009 at 11:11 AM.
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