Is anyone else experiencing engine knock at low RPMs? Now that the warm weather is here and my windows have been down, I've been noticing some pinging up until ~2300 RPM, especially when climbing hills.

I have a stock '03 w/ 15k miles, and I always use 93 or 94 octane gas, and I don't remember hearing it last summer. I was wondering what causes this and what I can do to prevent it. Do I need to have the timing adjusted or is there some sort of additive I should add to my gas?

 

I'd get it to the dealer, shouldnt be a problem with the car standard.