Back again guy's! I have a 95 yj I-6 with 186,000 on it. Recently there was a tapping noise, thought it threw a rod, but it turns out it was coming from the top. Brought it in to have it looked at, they did a compression test and said that Cyl 1 wasn't firing, replaced the plugs, but I had no cash to go further. So...I am going to pull the vavle cover off tomorrow and take a peek, how can I tell if a lifter is bad, and can I start the engine with the valve cover off to see if the lifters are working??? Any help is appreciated!