I had a 99 civic EX coupe and one day it started ticking, so about 2 weeks went by and I went down and had the valves adjusted, I changed the oil, it still ticked. Later that night the same day, I made a 60 mile trip to the next city. On the way back, the ticking got louder, and then it turned into a knocking sound, then the car started slowing down, and then died. After being towed back to home, I pulled the head off, and checked it out, Nothing. I then dropped the pan, and found metal flakes everywhere. #1 Cyl rod bearing was gone. You better get your engine checked out. My civic only had 71000 miles on it.