Quote: So basicaly the valves were being held open and it didn't show on the compression test because you did'nt do a leakdown?
Not necessarily, without enough oil pressure the hydraulic lifters could be collapse and not show because they did not pump up enough with just cranking. But with the motor running and the lifters pumped up the valves could not close.
Aah i see, i'm assuming thats one of the reason the motor is supposed to be warm when doing a compression test, so the lifters are fully pumped up?
