92' 240sx injectors not working

[IHCAutoSports240]

Does anyone have any sugestions on why my injectors are not squirting fuel. I checked the fsm, the injectors are fine and the wiring to each injector is fine and there is 12v power on the red wires. Has anyone had a similar problem or would it just be the ecu is bad? Please help someone.....Oh i forgot to mention this is also part of a ka24e to ka24de swap into my 89 240sx.

[NISTECH]

are you sure fuel pressure is ok? the ecm decides when to fire the injectors by a signal sent to it from the distributors crank angle sensor. there should be 2 feeds from the crank angle sensor to the ecm. basically one is for coil and one is for injectors. the ecm gorunds the injectors for x.x amount of milliseconds determined by inputs from crank angle sensor,mass airflow sensor, coolant temp and a few other. if you have no fuel discharge at all you should focus your checks to the crank angle sensor first then the mass airflow.

[IHCAutoSports240]

Yes fuel pressure is fine. Should i be looking for voltage or continuity on the crank angle sensor and the maf to the ecu?

[NISTECH]

do you have a dso?

[IHCAutoSports240]

Dso? Please explain.

[NISTECH]

voltage or continuity is really not relevant. it is a signal you need to see. but a voltage spike is what you will look for if using a volt meter. one of the wires should be purple and I am not sure of the other wire maybe white but not sure. if you get the wire colors off the distributer large plug I could probably tell you which 2 wires to check while cranking.

[NISTECH]

I would say no you dont have one by your answer. It is a "Digital Storage Oscilliscope"

[IHCAutoSports240]

Okay that makes alot of sense to me. So pretty much if the signal is there than i have a bad ecu ?

[IHCAutoSports240]

Would a light tester would be better to use?

[IHCAutoSports240]

LOL!!, no sorry not that advance.

[NISTECH]

no do not use a test light on the signal wire. NEVER use a test light when check computer circuits you'll fry drivers. you need to use a high impedance volt meter to protect the ecm drivers from high current flow.

I believe your dist has 6 wires 3 blacks 1 purple 1 red and 1 white. but am not 100% since I work on so many different nissans its near impossible to remember wire colors specifically. but there is a common pattern so if you get me the colors I can tell you what wires to look for a signal on.

this test will not be 100% accurate but it will at least tell you something is going on which would cause the injectors to at least do something other then not fire at all.

[IHCAutoSports240]

Okay i'll get you the colors, brb

[IHCAutoSports240]

okay there is only 3 colors black, white, and pink

[NISTECH]

how many wires 5 or 6?

[IHCAutoSports240]

there are only 3 wires going into the distributor

[NISTECH]

this distributor is out of the de I hope? and did you get the ecm as well from the other car?

[IHCAutoSports240]

Yes it is the de distributor and the ecu also.

[NISTECH]

your white wire is one of the signals from the dist. but there should be a second signal wire. there are 2 signals the ecm needs to see cam and crank degree signals. the other may be a crank angle sensor on the bell housing. is there a sensor located there?

[IHCAutoSports240]

No sensor on the bell housing it is the 89' transmission connected to the ka24de

[NISTECH]

I am going to have to check the FSM to help you any further. that distributor should have 2 signals the fact it only has 3 wires doesnt seem correct to me. like I said the ecm needs to see 2 signals to fire the injectors and fire the plugs. go to the parts store and pick up a noid light to plug into the injector connectors and be sure they are not getting a ground pulse from the ecm. I use one for a gm since they dont carry nissan specific ones. also take a good look at all your grounds make sure they are all in place and secure. Btw the power source to the injectors is constant from a relay when the key is turned on, the power is not supplied from the ecm.

[IHCAutoSports240]

Thanks a million, I appreciate all your help. I am going to see about the noid lights hopefully someone carries them around here.

[NISTECH]

yea they are pretty common at auto zone and kragens. I wont have a FSM available to me till monday But will look it up when time allows

[NISTECH]

ok did the research. the FSM says I am wrong you have 4 wires to your dist. 2 blacks 1white and 1 white with black tracer if looking at your connector from the harness side with the tab at the top pin 1 is on the left. going across its like this pin 1 is your 180 degree signal (cam position signal) pin 2 is your 1 degree signal(crank position signal) pin 3 is battery power and pin 4 is your ground. check for power and ground on 3 and 4 with the key in the on position. then check for signal from pin 1 and 2 while cranking. you should see pretty much glitches as it is cranked on the both signal wires check them one at a time.