misfire and hesitation in open or closed loop... no o2 voltages

[xploder98]

Well, time to start takin er apart. Just Down to injectors. I'll Ultrasonic clean them and my rail, the change out gaskets, retorque head studs while its all off, and somethin i been wantin to do for a while is pressurize my plastic upper manifold and check for leaks. Will let u guys know wut happens. Btw thanks for everyones input, help, and ideas. This site is probably the reason the majority of us still have our explorers. If theres ever a question to ask i come here! And the help is always appreciated! Thanks

 

[xploder98]

What can cause the timing to go from 9.5 degrees to 19 within 75 rpm? Bad crankshaft position sensor? i know how to test it but its kinda impossible for me since I'm doin all this by myself. I cant crank the engine and hold volt meter under the radiator. My arms aint long enough