I don't want to crank the engine because when I was pulling 2 of the injectors out I believe the little plastic cap on the end of the injector tip came off and fell into the hole, so I don't want to lose it to the compression of the cylinder. 4 of them still had the cap but 2 didn't, so I want to possibly pull of the intake and see if it fell in. Is this cap on the end of the injector important, or is it just a heat protector that won't affect performance. I want to check all the injectors before I go and pull off the intake. I'm checking for a leaky injector, and one that is either plugged or just plain not working, because i've been having a misfire problem that was not solved by cap, rotor, wires and plugs, but they did help. But I'm still having bogging down problems, a fairly stable but rough idle, and it sometimes misfires even at higher rpms. i already checked compression and it was fine, so I don't suspect a head gasket problem, so I'm checking the injectors to see if one is all gummed up or firing improperly. Oh, and Also, its a manual, I wouldn't have gotten it without it.