Did a 'dry' rudimentary check, compressions ran from 100 to a 70 to an 80 and a 90. Seems low 'eh, sounds okay though and the plugs all looked good, none wet, all brown to tan.

Why am I taking ALL THE PLUGS out? Would I not get a truer reading by testing one at a time with the other plugs in?

Also testing with rad out and just the timing belt on everything else is unhooked. Should I be?