injectors not working

[jspec4u]

hello i have a 1993 240sx with a blacktop sr20det swap installed. It wont start. I have spark and my fuel pump is working, i have fuel in the fuel rail, plenty. My injectors are not firing. If i spray starting fluid in the intake it will run. I have rechecked all my wiring and it appears to be correct. Im just wondering if anyone had any ideas or could tell me what sensors or parts control injector pulse. I have power to them but no pulse with a noid light. I dont know what else to try. Any help would be greatly appreciated.

[240life]

cas sends the pulse, but i would try reversing your fuel lines first, it is a very common problem

[Justin35ll]

Yeah he makes a good point

[jspec4u]

i believe my fuel lines are correct. My line from the filter goes to the back side of the rail and the other line comes out of the fuel pressure regulator. I checked the flow of fuel and its flowing out of the regulator. My cas cover is cracked so i was wondering if it could be damaged. It came that way. I dont know what else it could be.

[240life]

If you are getting a signal to your coilpacks ( which is also controlled by the CAS ) then you should be recieving a signal to your injectors. Have somebody turn the engine over and listen for injector clicking if they are then switch your lines....I spent more then I would like to admit chasing non-exhisting problems due to backwards fuel lines....even though your filter is in the right spot try switching the lines over, and replace your fuel filter if you haven't yet. And STOP using ETHER you will damage your engine

[jspec4u]

Ok i will switch them and see what happens. I only used throttle body cleaner, and it was just to troubleshoot. This told me it was a fuel issue. But i wont use it any more now. I have triple checked my wiring, bc i wired it up myself. Everything is just like the diagrams. The only other problem the car is experiencing is no power to the starter solenoid. Could this be related in anyway? I have the clutch pushed in and i have power to the ecu bc i hear my fuel pump working. The only upgrades are boltons: walbro 255lph, fmic,tubular manifold,o2 housing, downpipe. Everything else is stock. Im starting to get frustrated... lol. O and i have a z32 fuel filter. Should the fuel go into the regulator or come out the regulator?

[240life]

fuel should flow out of the regulator, as far as your solenoid on your starter, either your power or ground are not installed or are loose, or a possible bad clutch relay (kind of like a neutral safety switch) that relay should be on the passenger side fender by the opening for the wires to pass through..

[jspec4u]

ok i tried the lines and i didnt work. But i do have flow coming out of the regulator, so i know they are right. what next? Could it be the ecu? Does the cas send separate signals to coils and injectors or is it just one?

[240life]

you need to check for proper voltage at the injector plugs.....on a side note this car turns over; correct?

[240life]

zer...startI think this post might help you

[jspec4u]

Yes the car turns over but only by jumping the starter. Have no power on the small wire to the starter. I have been jumping it so that i could be in the engine bay while it was turning over. That post is helpful thanks. Im pretty good with wiring if i could just get a diagram. I dont know wich wires to test or where they go. He said the 4 injector wires are powered by two red wires I guess i need to check my voltage at the injectors first of all, then check continuity from the pcm. Do you know where i could get some sort of wiring diagram. The swap has never ran since ive had it. Its straight from japan and i did the harness, i soutered all conections but that doesnt mean there isnt a factory defect.

[240life]

You are going to have to search the forums and internet for this. I only have a paperback version, and the last time I looked for an on-line version the electronic FSM's were not working. Places like PhatG20 have them people on this forum might have a usable link etc... good luck

[jspec4u]

thanks, i really appreciate all the help that you have given me. Youve helped me narrow it down alot. I am going to tear into the wiring, i will let you know something as soon as i find it. Thanks alot.

[240life]

thats what we are here for Your welcome And by the way you might want to pull your starter real quick and check that the solonoid is connected to your starter....on the sr starter there are three things that need to be connected......1) 12v from battery to bottom post of solenoid......2) lead from starter connects to the top post of solonoid.....3) the tab on the solonoid connects to a ground (i think it is green,it should have a 1 inch long black plastic end )

[jspec4u]

So i have 12v to all my injectors on both wires. While starting it i believe you should have a ground signal wich makes the injector spray, i dont have that. Can anyone tell me where my grounds are on this car maybe i missed one. I have the two on the intake manifold hooked up. The manifold itself is grounded to the body. What are some other grounds?

[240life]

There should be one on the back of the head that connects to a spade plug on your firewall and a large one the size of your 12V battery wire connected from I belive your back side of the intake to your chassis (I believe you mentioned that one) you might want to check for continuity from your ecu to your injectors also inspect the inside of your ecu for damage (be sure to disconnect your battery before installing and removing your ecu) I am about 10,000 miles from my car right now or I would upload a recent photo...can't complain though Sicily is warmer then Maine I would highly recomend you obtain a s14sr fsm and use there troubleshooting section

[240life]

http://www.mediafire.com/?1ztkzlzyzmbThat is a working link where you can download and save the Fsm as a PDF file Happy reading

[the converted]

It is the ecu that grounds out the injectors to pulse them. If you have 12v to them, then check your ecu grounds and try a different computer. It's possible that someone fried the injector drivers in the ecu before you got it.

[jspec4u]

do you know which ground the ecu gets its ground from? Or is it grounded when you bolt it down, bc i dont have my ecu bolted in yet.

[jspec4u]

So i have tested my injectors and i have 12volts at all of them but im not getting the ground pulse from the pcm. I tested at the pcm connector for all my grounds including my injector ground and they all checked out good. I ohmed the wires from my pcm to my injectors and found very little resistance meaning no breaks or shorts in the wires. Does this pretty much mean its the pcm? If so im going to just buy one of the tuned ones while im spending the money.

[the converted]

That would be my next step in the line. See if there is someone in the area that can lend you one just to check, or a junk yard. Most of the places that tune, tune your ecu, so that won't fix anything.

[jspec4u]

so got a know good ecu, still no injectors firing. Help please been trying to figure this out forever now it seems like. Could it be cas, or timing, or even harness problems? Any help would be greatly appreciated.

[the converted]

I guess I'd be checking every ground and trying to figure it out. AEM has a good pin out of the ecu wiring here http://www.aempower.com/images...1.pdf

[jspec4u]

checked all the grounds to the ecu checked out good. Injector wires ohmed out good. I can get my hands on a cas and an ignitor but they are off a s14 sr. Will they work on my s13 blacktop? Im pretty sure the ignitor will but im not sure about the cas.

[jspec4u]

I got it started today. I pulled the cas out and turned it by hand. I heard no injectors clicking. I tried another known good cas(cam angle sensor) Installed by directions on heavy throttle. Car fired right up. Runs like a champ now. I just wanted to finish the story incase anyone was interested. Also wanted to thank the people that helped me along the way.

[the converted]

Sweet! Wanna get rid of the broken CAS?

[vocationalzero]

I got it started today. I pulled the cas out and turned it by hand. I heard no injectors clicking. I tried another known good cas(cam angle sensor) Installed by directions on heavy throttle. Car fired right up. Runs like a champ now. I just wanted to finish the story incase anyone was interested. Also wanted to thank the people that helped me along the way.

What part of the CAS do you actually turn by hand? The whole thing or just the gear? I have the same problem too with the injectors not getting their pulse signal. But I tried to turn the CAS and it was as if it was frozen.

[the converted]

Pull the whole thing out of the engine and spin the gear.

[jspec4u]

You actually take the two bolts out of the cas, pull the sensor all the way out. Plug the harness back up to the sensor, turn the ignition switch to the run position (not the start position). Then with the cas out you turn the gear part of it with your hand, you should hear all of the injectors click. Try that and get back with me.

[vocationalzero]

YAY! my cas is bad! All it did was tell the fuel pump to turn on but no injector click!