Well, I'm trying to diagnose a pretty ugly sounding knock coming from my motor. I don't personally own my own compression gauge, but I do have a leak down test kit. I have a buddy with a compression gauge, but I got tired of waiting for him and started to try and figure out wtf is the deal. So I got a little ahead of myself. I'm just trying to cover the bases before I tear into her. It did pass the leak down test though...