Injectors #1 and sometimes #2 not pulsing fuel

[CruiZZZin 78]

My 78 280z is dropping #1 cylinder and sometimes #2 cylinder due to the lack of signal to their injectors. I have rebuilt injectors and brand new connectors. What could be causing this problem?

[Mr.INSANE]

Bad Ground, Bad Wiring

 

Since its just #1 and #2 I suspect bad wiring or connection I would test it with an ohm meter

[CruiZZZin 78]

Thanks for the reply, Which connections should I check for this problem? injector connectors? ecu connections? I'm not sure. I really appreciate the help!

[mom'sZ]

Look at the injector harness, it is a separate harness from the rest of the car. Trace it along and find the grounds. I think there is one attached to a bracket on the intake manifold and one attached to the firewall. Disconnect the grounds and clean the terminal with a wire brush or emory paper and do the same on the spot it attaches to.

It's odd that only #1 and 2 do it. How did you replace your connector? Maybe double check your splice job

[CruiZZZin 78]

thanks for the help guys. I did ALOT of work on it tonight and found that I wasn't getting battery voltage at the ecu connector for #1 injector. So after a ton of testing on the ENTIRE system I found that my large dropping resistor was bad. Hopefully this is the last of my electrical worries. The car is still missing but I have all my cylinders now!

thanks again