I have been fighting with these injector's for days now.
For those who don't know. This is a 83 N/A auto
I have changed ECU's, Relay(behind batt) checked wires.
Fuel is geting to the injector's. I got near 40 PSI at injector's.
i have put a new fuel filter on as well. Car will fire up if primed and kept primed. but if you stop adding gas or starter fluid directly into the intake, she will die. I have the injector's unmounted from intake, but still connected to rail and wire's. I am doing this so i can actuly see if they are fireing. And not a lick. Any one got idea's?

 

did you check for voltage? check continuity between the injectors and the ECU and the injectors and the EFI relay? Have you checked the EFI relay? fuse links? Fuses?

 

what's the correct voltage that i am supposed to be lookin for?

 

I connected the volt meter to the injector relay(the red wire) that wire is only supposed to get power if the relay click's. and the relay clicks. the wire get's power. So i check this wire at ECU, it works. So sig from relay is there. but no sig from ECU to Injector's. i tested with both ecu's. There has to be somthing somwhere that effects injector sig.

 

The ECU grounds the injectors. Check to makes sure all the ECU grounds are actually grounded. If not then the ECU has no way of grounding the injectors. But the positive wire to the injectors should be hot when the ignition switch is ON.

 

I get a .03 on volt meter for possy on all injector lines. Does this help? If some one here had a volt meter, and a running Z. taking it to the possy injector lines with the meter set to DC 20. would help tell me if mine are off.

 

Sounds liek to me EFI relay located right on the left hand side of the battery .. there is like a little cubby hole that also holds onto the " fusable links.. try to replace that first.. that was one of my problems on my 83 280zx turbo digital dash 2+2.. now all i need is a ne TPS sensor.. damit !

 

been there. changed it. tested it. she's workin fine.

 

have you verified that all the ECU grounds are grounded?

 

there's one bigg one the connects to the ECU sepertly then the rest. That one is connected and runs into the wire harness that goes into the dash. I have no clue where that one mounts down at. the ECU is bolted in with both bolts. if there are other grounds. info on where they ground to would help.

 

I believe most of the grounds mount in the engine compartment. Some to the manifold and areas like that. Not sure of exact locations though, its been a while and I dont have the Z here to check it out either.

Does your year have the dropping resistors?

 

i have 7 grounds on driver side of motor. the only resistor i know of is the coil one. Although i don't know if i have that hooked up right. The resitor it's self is bolted down on the top mount bolt of the coil. while the long ground wire coming from the resistor is mounted to motor. I beleve the wire going into the resistor is blue and comes out black. Lookin at the diff in 80-83 wire diagrams. No i do not have the droping resistor's.

 

If your woundering how i am testing my injector's to see if there fireing. this is how. Also 4 of the main drive side grounds. and this reading was from injector #2. All of witch have the same reading. Both when the car is on. and off.

 

0.06V isn't even really a reading. Consider that 0 V. Injectors aren't getting any power. Looks to me like the + side isn't juicing up. Trace the circuit and you're bound to find out where the break is. Even if the grounds are good you're not going to get power through them without a + power source.

 

man i swaer J nos everything in the world about Zs...

 

Yeah he does know his stuff quite well. I nominate J to be a moderator. All in favor say I.

 

The .06 is the reading at thin injector's as well as right out of the ECU. The wires from the ECU to the Injector's are fine. so it's got to be somthign somewhere causeing this problem.

 

I reset the ecu. I was geting a .54V off the lines today. but it did not last. the V went down. slowly, but the number's went down.

 

Do you have a wiring schematic of the FI? Do you have an ohmmeter? Armed with those two you should be able to narrow it down in a day. You have to take a systematic approach to troubleshooting or you're likely to miss something.

 

I am gona keep tryin. but i got an idea on hand that can solve this problem. And as soon as i can get the $$$ to spare for it. I think a MegaSquirt can help. This is just geting on my nerves to much.

 

Those figures are your voltage potential of your sensor grounds to true ground.

 

like i know what your talkin about here. Remember, I live in Mississippi. I can do elec work, but if you speak it. I not know a damn thing you say.

 

maybe he's talking about the voltage drop across the grounds. Other than that he's got me too.

Did you figure anything else out on your Z fubar?

 

right now i am pulling the entire ECU harness out. gona go over each wire. messy job. old stock e-tape get's very sticky

 

All the manuals state a spec for voltage potential between ground points.

If there is any, it is usually because one has a bad connection.