I have a '92 accord ex. at start up valves made a loud noise, then went away after a minute. after that it was quiet. I decided to adjust the valves to help. When I checked they where all way over tightened. Now that I have adjusted them (twice to make sure) to factory 10 intake and 12 exhaust, they are very noisey all the time. I upgraded oils, same noise. I don't know what else to do!! should I tighten the hell out of them like they were before?