i haven't been able to get the nuclear temps (over 600) for TRexing steaks, etc on my last cook. i haven't cleaned out the ash from the large BGE for the last 4 or 5 cooks. (i'm still waiting for the delivery of the ash tool from an online merchant). [p]it doesn't seeem like there's a lot of ash to me...maybe about a layer 1/8 to 1/4 inches high. there's plenty of room for air flow, in my opinion.[p]the firebox is full of lump, some fresh, some old. i shook all the lump around to knock off the ash...made sure the hole in the firebox was lined up with the bottom draft door. just can't get temps going that high...[p]in my previous 4 or 5 cooks, i was always able to get the needle past the 750 mark...now, i can barely get it up to 600. [p]what gives, y'all???