I replaced my fuel rail and installed some green top Injectors into my 1981 280zx. When trying to crank it 6 puffs of smoke (one per injector) came out from the injectors ports. Do the injectors have little seals around them that I forgot to Install?? Im not sure what to do. I did notice a gap between the hole for the imjectors and the Injectors themselves. Any ideas?

 

The injectors have O-rings. Also, the plastic pieces that fit over each injector might be broken.

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They're cheap and probably available at one of your local parts stores.  I searched on 280Z but 280ZX is the same.  The small ring seals, the big top ring applies the downward force and vibration damping.

https://www.oreillyauto.com/detail/b/standard-intermotor-5820/fuel---emissions-16775/fuel-injection-16471/fuel-injector-seal-o-ring-kit-12312/ee721b9bfdb5/standard-intermotor-fuel-injector-seal-kit/sk4/6017490/1976/nissan/280z?q=injector+seals&pos=3

https://www.oreillyauto.com/search/1976/nissan/280z?q=injector+seals

Aleigjty! I think I'm missing the little o rings like y'all linked and sent pictures of. I'll pull off the fuel rail and injectors and get a picture of them.

On a side note. On the blue ECU plug under the dash, there is a 2 pin plug with a yellow solid wire (I think) and a yellow worth red stripe wire. When I replaced the harness I failed to note where that plugs in. Any ideas?

 

Thank you for the help