[jakeru]

These injectors have copper electrical terminals. Fresh copper is a great conductor. So they work great when new. But dark color/black corroded/patina'ed copper does not conduct electricity at all. Try it with your ohm-tester. Move around on various places on your injector. Then try scratching the dark copper surface clean, until it is bright shiny copper. It will conduct like new again.

I think material selection of the injector electrical connector (copper), torn rubber electrical boots (my maxima has three torn, three in tact), and old age contribute to the problem.

I wonder how many perfectly good injectors we're replacing that all they need are their copper electrical connections scraped/restored, to be maybe good to go for another 10-20 years.

If anyone has a good idea how to clean those copper conductors easier than mine (which is, scraping them with a small sharpened screwdriver.) Let me know. I only scraped a couple of mine (that needed it the most) and still need to do the rest because now I think the others I didn't do yet are acting up again. Preferably with minimal intake manifold disassembly and also leaving the injectors and rails installed in the engine.

I'm thinking some sort of dremel wire brush exists that may do the trick (it's got to fit inside the plastic electrical terminal housing, which is a pretty tight spot), but I haven't located it yet.