korgol117

i have a 79 280zx that stopped runnin on me. i sprayed starting fluid in through the intake and it ran for a few seconds and then died so i replaced the fuel pump cleaned the tank and replaced the filter. it still didnt run so i did a motorvac thinkin it might be a plugged fuel rail. it cycled through relatively clean but still no fire. i hooked up a noid light and i have no injector pulse to any injector. efi main relay is workin and sending power to the ecu. i have power goin to and from the dropping resistors. i would think that if its an ecu problem that it wouldnt be all 6 injectors all at one time. i have heard that if one injector is shorted out no injectors will work. has anyone heard anything like this or have any other idea of what might cause no injector pulse? i have tried searching older threads but iv been lookin for 3 days on different websites and all data and am having no luck. PLEASE HELP!

hoov100

Do you have fuel getting to the injectors?

87pyro3

did you check your fuseble links? relays? fuses?
do you have the incomeing and out going fuel lines reversed? are the connectors in good health? any cut wires? is the buld in your tester good?
there is a lot of area to cover if there is power and no result lol some times its the stupid stuff that gets you

korgol117

there is fuel circulating through the fuel rail and the lines are not reversed. fusible links seem to be ok and no change if replaced with a jumper wire connectors look ok and are tight the efi main relay is sending power to the ecu i have tried 3 noid lights just in case

SHADY280

The ecu fires all the injectors at the same time. It's a primitive batch fire system. If you have power at the dropping resistors that's good. Test the injectors impedance. I think it should be 1.25 ohms, but check your manual. Also you did check spark right???

duckyz

Well, at this point, I'd start looking at the simple stuff. You know, check the connectors for the injectors and make sure everything is clean. Pull an injector and see if the needle isn't stuck closed. Jewelry pliers work good for that, or you can hold it away from you while someone is trying to start the car.... I wouldn't recommend smoking if you do that.

...just sayin'

korgol117

i thought the batch fire was only on the 81-83 models?

WanganDevilZ

I have a 77' and it fires all at once as well, same engine, same ECU I believe

hoov100

Unplug the ECU for a few second and plug it back in. Works on every road stranded 280z/zx I have come across.

korgol117

unplugged the ecu for 10 minutes reinstalled and no change... tried a different ecu and still no injector pulse

korgol117

UPDATE: i was out of ideas and just lookin around and decided to reattach the wire for the temp gauge and it started right up... apparently that is a temp gauge wire and an engine shut down switch... who knew

steady88

Hi korgol117, I'm having a similar problem with my 79, 280zx which I recently got. It will start by spraying starter fluid or fuel into the air intake, but appears the injectors are not working at all. Which temp gauge wire were you referring to?

FricFrac

I'm going to say that's a grounding issue or something. The temp sensor runs through the EFI harness then jumps into the body harness in the fender behind the battery then up to the temp gauge. It doesn't go to the ECU - the ECU has its own desperate (and more accurate) temp sensors.

Disconnect all the injectors and see if you have power at one side of the connector. If you don't disconnect all of them (or all of one bank) you will measure power on both sides because the other injectors are hooked up in parallel and are essentially jumpers to the other side of the parallel plugs