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There's a special tool for testing injectors. It's basically a fuel rail to feed the injectors, a circuit to drive the injectors, and a row of graduated cylinders for the injectors to spray into. The machine pulses the injectors, and the cylinders collect the fuel. While they're pulsing, you can confirm that the spray pattern looks good (nothing obviously clogged or dripping). When they stop, you look at how much fuel has collected in the cylinders. If you know what the injectors' flow rate should be, and you know how long they were open during the test, then you have your spec to check them against. Without that special tool, you could still check the flow rates against each other, but this would only tell you if they're consistent, not if they're correct. I guess you could swap one known good factory injector in place of one of the new ones and run the test again. Have you checked the spark plugs? Are all six spark plugs black or gas-soaked? If they all look rich, then either all of the injectors are wrong (which would make sense if the flow rate on your new set is incorrect), or a bad sensor reading is making the computer inject that much fuel on purpose (likely coolant temp). If only some of the plugs are rich, that suggests you've got bad injectors on those particular cylinders. The OE injectors have colored dots on them. I do not know what changed between the various colors, but it sounds like some of them may have different flow rates. I think blue dot and black dot are just different spray patterns, because some previous mechanic replaced one of mine with the wrong color, and it doesn't seem to care. But, yeah, ideally you want a matched set. My VG33 (which was previously swapped into another WD21, so it has the VG30 intake) has VG33 injectors in it. Different electrical connectors, but the same flow rate AFAIK. Not sure if that's the same thing you're looking at with the Z car injectors. But if you've got the injectors that the VG33 came with, I'd give those a shot. I haven't had to source an injector yet, so I'm no help there. I think @gamellott replaced one recently.

Finally back on the forum after a couple years. The rig has stayed roughly the same since my last post, just minor tweaks here and there. Mileage is currently at 373,000. My goal for the truck is to make half a million if I can pull it off. Shes an old ugly workhorse at this point, and I need to address the roof basket at some point because it’s got a good amount of rust. So far the only issue with the truck is transmission engagement on super cold days before the truck warms up. And of course it’s still leaking a lot of oil. I figure this summer I’ll look into a transmission rebuild/swap and address the rear main seal at that time. I was motivated to post again because I just picked up a set of Trackmotive CV axles from rock auto that are supposed to be built with extended travel in them. My goal is to use them so I can safely add an additional 1” spacer to the struts and level out the front a bit. My rear sits a higher even with the tools and spare parts because I’m running the heavy Land Rover coils. Before recently I had no idea these types of CVs existed for our trucks. I’ll update the thread with how it works out.

I went raid the pick a part today. Both stanza's they had were already missing injectors but they have 12 altimas with 2.4 DOHC. I pulled an injector from one and tried to pull one from a pathfinder to compare the differences but it started raining on me. So I took the one injector with me and compared it at home. I don't have the rail off of my parts truck so I compared it to the 3.3 quest rail. The injectors are made different but looks like it would seal in the 3.3 rail, just need a different style cap. It sticks out the bottom a little too but I don't think that would hurt anything. Maybe a rail from another VG would work better. James