No Injector Power!!

[newparkauto]

Ok I have a 78 280z i bought not running and fully rebuilt internally. Something was "mentioned" about fuel problems when i got it but the internals were in need of rebuilding anyhow (slightly bent intake valves).

I have got everything back up and going except that my injectors have NO POWER to them. I believe that charger wires were crossed on the batt also! So ive been checking for the injection relay-but there is much discrepancy between where it is located on the 78 Model.

I found the one by the battery under hood, but the cabin one i did not see by the ecu or passenger kick panel? Anyone know WHERE the darn thing is or ift here even IS another one? the one i found looked ok.

Or any suggestions on what else to do to solve the no power problem- maybe computer??

Thanks in advance sorry for the length- oh and proddate 02/78

[FastWoman]

You can find the ECU beneath the DRIVER-side kick panel. I don't know what you mean by an "injection relay." If you mean the main ignition relay, that's inside that black metal box mounted to the passenger-side inner fender. Unscrew the screws around the backside of it, and remove the plastic cover plate that inserts into the back end.

The best advice I can give you is to get hold of a factory service manual for the '78 Z (the Nissan publication). You can download it online for free here:

http://www.xenons30.com/reference.html

Better still, look for a paper copy on Amazon or Ebay. They come up occasionally.

Without knowing more about your situation, I'd suggest attention to the following items:

(1) Is there a working connection between the ignition coil (-) and the #1 terminal of the ECU? That's the clock signal that induces the ECU to fire the injectors (once every three sparks).

(2) Do you have +12 feeding your ECU?

(3) Are your drop resistors well connected and in working order? They are in series with the injectors and are located in an assembly just beneath the master cylinders on your firewall.

(4) Are your injector connectors in good condition? They often get rather crusty and crumbly.

[240260280z]

There is a connector and fusible link that powers the whole EFI system (including ECU and injectors).

The fusible link is in a small wire from the firewall that goes to the +pos battery terminal. There is a good chance it is loose at the connection or the fusible link in it blew.

You can see the EFI Power Connector in the top two photos on this page: http://atlanticz.ca/zclub/techtips/electricalconnections/index.html

The cable from the battery to the connector is the fusible link.

The efi fusible link is circled in lower left of this photo. It is separate from the other fusible links that are bundled near the strut tower:

Edited June 10, 2011 by Blue

[newparkauto]

Hey thanks so much for the help! What i ended up figuring out is when i turned the ignition the test light flickered on for a split second- so i figured the ign switch. Soi jumped the coil straight from the battery, cranked it, and she fired up for the first time since the rebuild! Weird part- the jump wire fell off and it kept running and now it cranks up every time? Maybe just needed some current passed through it.

It is now running, idling quite high ( im thinking sticky throttle becuase it slows down when i return it manually) BUT i do have one fuel problem now. It will run and idle for 15-30 minutes and then all of the sudden start spewing white smoke and start running rich (smell fuel). Any idea on any adjustments ( besides Valves) i need to do since its a fresh build? or maybe a sensor that would be causing this?? Thanks!