Injectors problem

[norcals13]

Hey everybody I'm having a problem with my sr motors my injectors r not fireing so I test my injectors and they're good and I test the harness with a noid light and I got no power going to the harness is there anything that could do that other then the harness being bad is an old harness that my friend gave me
Ill appreciate any info

[slider2828]

Try a new ecu. Injector's work on ground. They fire when the ecu sends a ground signal...

[cotbu]

Test for 12v at the clips with a multimeter. A noid light only tells you if they are working. A 12v test can tell you were the problem is.

[norcals13]

Ok I test the harness with a volt meter all r in the negative voltage ecu I just got it not too long ago I don't wanna replace it if is not bad is there a way to test it cuz like I said the harness was made and the cables by the O2 sensor and by the cas plugs are showing they look kind of brutal I was thinking that could be the problem m I rite?

[norcals13]

Is there a way to test the cas plug see if I got power to it cuz the wires in the plug look brutal

[slider2828]

Its all in the Factory Service manual on how to test.... seriously....

[norcals13]

Im not that good at using zilvia net thats y im asking wut service manual?

[norcals13]

Question for u guys I found one of the wires on the pug to the cas almost broken holding by one lil cable it was the white wire I check a wire diagram and is for the injectors that could be the problem rite?

[jedi03]

could be...also theres a nice ground on the back of the motor for those too

[norcals13]

That ground is bolted to the head right?

[slider2828]

no it goes to chassis.... at the very back

[norcals13]

U can see it on the top?

[norcals13]

Ok new update I put a new cas harness still nothing cas is working cuz if my ignition is on Nd I unplug and plug my cass I can hear everything cliking the ground ind the ba,ck is good I can startes with starting fluid but ill die after the starting fluid is gonne anybody this is really stressfull I need to have this cur running before I leave to the service

[norcals13]

I have 12volts on all harness for the injectors I starting to think is an ecu proble

[norcals13]

I have a z32 maf and stock ecu can that be the problem?

[slider2828]

You need a sr20det mafs with a stock ecu.

Get a new ecu.... stock chasing bugs and try it.... Hence that is what I said like 10 posts above. Just ask someone to borrow it and call it a day.

[norcals13]

Yea im a try that

[norcals13]

Ok I put my ecu on my friends car and it fire rite up so is not the ecu I'm thinking is my harness cuz the last owner burn an ecu by wireing a maf wrong wut do u guys think also I read that an orange wire that comes out of the dash conector suppose to have 12+ volts I tested that wire and I get 12+ with the key one but when I crank it it drops to 9 is that ok?

[wangan_cruiser]

you are still dealing with this issue?

[norcals13]

Yea hella streesing I think is my harness

[wangan_cruiser]

there is a red wire from each injector clips that supply 12v when you turn on the ign key on (dont crank). that red wire goes to the ecu then goes back from the plug next to the battery (where you spliced).

if the harness was good i would say check that plug next to the battery for any broken crimped connectors or snapped soldered wires.

there is a way to fix a harness its not that hard you just need to be patient and learn how wiring works. get yourself a fsm and look for the wiring pin out and diaghram then start from there.

[slider2828]

If the ecu's good.... Did you check really closely all the fuses? Sometimes it could be a hairline break and you can't see if them glancing from the top

[norcals13]

I would check the conector next to my battery cuz I have 12v coming out of the red wire on my injectors and yea check all fuses all fuses good change all 3 relays with new one on the conector by the battery I need to have 12v with the engine on rite?

[norcals13]

And wut do u mean by a hardline braak?

[slider2828]

Short of all that, do you even smell fuel when you try to crank it? Else, its gotta be in the wiring.

[norcals13]

I get fuel to the last line before the fuel rail but my injectors don't spray wen I crank it I pull the fuel rail out with the injectors and it doesn't but I can make the injectors spray if I ground it with a wire directly to the injector that's y I'm thinking is the harness

[wangan_cruiser]

then check your ground. are those 2 10mm bolt are screwed in on the manifold? those wires are located closest to the firewall.

or do get a vom and do a contuinity test on ground on each injectors clips to see if you are getting ground.

if you dont know how to do continuity test

Multimeter Tutorial - Learning about continuity

[norcals13]

Sorry not the best on electrical but for a continuity test key on red side on the vom goes to the injector clip black to any ground rite?

[norcals13]

Cuz if I do black on vom to the negative on battery and red on vom to injector clip I get 0 or open

[wangan_cruiser]

Originally Posted by norcals13

Cuz if I do black on vom to the negative on battery and red on vom to injector clip I get 0 or open

then there is a break. check where you think could be a splice