fuel injection problem

[Guest Thumper280]

ok i have an 82 280zx na. i have gotten everything to work but the fuel injectors. i checked all the wires, they seem good. have new injectors. i bought a new ecu thinking it will fix the problem, but still the same problem. ok heres the problem. the injectors wont spray. both sides of the wiring clip are positive. you hook a groung light to them and they both turn the light on on every single injector except for one. dont know why that is. like i said everything works down to the little engine carpment light. i put both ecu's in and they both give the same result. the ecu doesnt send any kind of signal to make the solinoid in the injectors squirt. i have done a lot of research and cant find any answers. can some one help please. shouldnt one side of the harness be negative and one positive going to the injectors? im dont know how this system works just have had a lot of input from friends.

[Tennesseejed]

You'll find lots of information in the EFI bible which, I think, is stickied in the Help Me section.

 

As for your problem, are you getting spark from your coil? Reason I ask is because Pin 1 of the ECU is connected to the negative side of the coil. As I understand it, when the ICU grounds to cause spark, the voltage change is sensed by the ECU through Pin 1.

 

In short, if you are not getting spark, then your ECU is not recieving the proper signal from the ignition system to know when to fire the injectors.

 

Disclaimer: I'm only familiar(ish) with '75-'78 280Zs and have no experience with ZXs. They could be different.

 

If you do have spark, it sounds like you have ruled out a faulty ECU as the culprit. I'd do all the tests in the EFI bible and check the whole FI system for continuity.