Gas in exhaust at cold start and pinging

My 2009 with 150k stinks up the garage on cold start up with the fine scent of unburned gasoline and this has been going on for at least 2 months. Car starts fine and runs normally. There are no codes and the spark plugs look a little carbon fouled and insulator rust red covered in a slight coat. Warm starts have no odor, and my 2005 with 215k does not have this issue (uses same gas). I also have pinging that occurs on warm days with any acceleration, and premium gas makes it better but it does not go away completely. I use Top Tier and have treated the fuel system with Techron and Gumout Regane over many tanks and it makes no difference.


I don’t know if the two are related, but does anybody have an idea? I have searched the forums and have not connected with anything solid.


Thanks in advance!