So I feel like a n00b cause I don't know too much tech stuff, but I've been doing some reading. My HX has a little bit of a tick, especially when it's cold, and in low-mid RPM. I know valve lash could be making my top end tick, and I've looked up a how to on it. I feel pretty confident that I could do it. Now while I was looking up info on lash, I found something saying that I have self adjusting valves, which sounds strange as hell, I'm going to look up how those work. I am ~8,000 miles into the 200K mark, and I have to change my timing belt (also looking up a how to). I know I should have done this BEFORE the 100,000 mark but I'm a poor tired lazy college student from Ohio. I also notice I only get about 30 miles/gallon, which is slightly lower than I feel I should expect from an HX. So I'm wondering: Does the D16Y5 have self adjusting valves, and could they still be lashing? Could my timing belt be causing the tick? Is this tick possibly causing shitty (I really shouldn't bitch about it anyway) gas mileage? Is there something else it could be? Maybe worn springs or something? I'm pretty sure it's in the top end, but I can't say for sure. It doesn't sound like a knock.