I had that problem with my CL (same engine) and one time they (Acura) took it out and cleaned the valve... but the problem is back again now (a year later) but i'm still under warranty so I'm going to have them change it. You could try to clean it (if you can find it, I have no idea where it is) as a temporary solution. And last I knew the recall was good for cars up to 100,000 miles, as its a recall, nothing to do with the cars warranty.