If you are getting that ground to positive, then I am betting that the injector is toast.? You can check resistance of the injectors at the harness connection near the fuel pressure regulator.??
I have done this a few times (replace a few at a time...) and just remove the rad fans, grill, and tilt the rad out to service position.? On my 99 I found that I had to remove the alternator to get to that one bolt on the intake manifold.? It is pretty methodical getting the manifold out.? ? Best advice I can give is to rig up a way to pressurize the manifold once that you have it all back together to check for any leaks.? It is easy to pinch an o ring when assembling the upper and lower manifold, the injectors are sandwiched in between the two.? I once got the van all back together to find a fuel leak due to a pinched o ring.? That was a bummer.
If you plan to only change the one bad one, be super careful removing and or handling the still good injectors.? Do not grab and twist by the electrical connector part, it will break right off.? If you buy all new injectors, they come with new o rings.? If you are reusing some injectors, buy new o rings.? I found inexpensive ones on rock?auto I believe.? You should only need to worry about the upper and lower o ring that seal the injector to the upper and lower manifold.? Lube them at assembly.? Clean up that intake manifold.? I replaced the upper and lower manifold gasket.? I took the throttle body off with the elbow, it seemed easier.? I reused that gasket at the elbow.
I have a thread on the samba, but it is not super in detail of the process.?
exovcds has a good video on youtube of the process.? Look him up, he has a lot of content.
Good Luck!? Feel free to bounce any questions off of me.
