injectors wont fire?

[preston240sx]

i dont think my injectors are firing how can i check this i checked my spark its good so im guessing my coils and ignitor is ok ... what bout cause them not to fire i have power to everything else

[govtworkhorse]

You can check to see if your injectors are good a couple ways.

1. unhook injector plug and measure resistance between pins on injector. I think it should be between 13-14 ohms. Check with factory service manual.

2. I believe you can turn your CAS and listen for clicking from injector(s) as well as feel it. But you would have to search for this method on how exactly to do it.

Also, have you tried putting a little raw gas directly in the cylinders and trying to start the motor? This should let you know if you are getting fuel that far in the system. If it starts, then dies, could be injectors, weak fuel pressure, old gas etc...

[preston240sx]

i pulled the coil out with the spark plug on it and cranked the car over it had spark so thats good ... that means the ignitor is working right ? i have fuel going to the rail i guess i'll get a fuel pressure gauge tomarrow i'll try the raw gas method ...

[govtworkhorse]

Yeah, I don't think you have a problem with spark. Try he raw gas method and let me know. Hopefully someone else will chime in by then and give you some more ideas.

[preston240sx]

yeah hopefully someone will chime .... this weekend if i cant find the problem i'ma start all over again with plgging everything in .....

[govtworkhorse]

Haha I've been in that boat a time or two myself.

[Darius]

is this for the rb25? if so, did you wire up your injector power wire to 12V switched power? (grey wire)

[gawdzilla]

stop cranking it over, you can't hear anything when you're doing that. i don't know why everyone is like "it cranks over but it won't start!!" there are many factors to the motor running, not just "cranking it over". it can literally be anything. the only thing you need to get the motor to crank over is basically the thick 2 gauge wire connected right. you don't even need an ECU or an engine harness in there to crank the motor.

take the CAS out and spin it by hand if you want to see if things are firing. put it in IGN and spin the CAS by hand in front of your car. if things are working right you'll hear the injectors clicking and if you pull out all the plugs and lay them across a grounded pipe they will spark in sequence.

[preston240sx]

yeah thx i'll try all the options hopefully one of these will be the right one i'll keep it all posted

[preston240sx]

Sweet well i poured some gas in the intake and turned the key and it fired right up!!! then died after bout 5 or 6 seconds ....so it runs ..Also how much fuel pressure should i have ? i took the CAS off and turned it all i could hear was the spark plugs and coils firing .. so what would cause the injectors not to fire would it be the ecu even though it run when i poured gas into it ? or could be not enough fuel pressure to make it ito the fuel rail past the regulator ...

[Darius]

<cough> fuel lines reversed <cough>

Also, when you spin the CAS, you should hear the injectors should fire. Is it even possible to hear a spark plug ignite??

[preston240sx]

fuel lines are'nt reversed .. i tried them both ways and got nothing its a rb20 and yeah you can hear something in there and its not the injectors

[govtworkhorse]

Glad to hear the gas method worked and your motor ran. Now start with getting a fuel pressure gauge as youll want one later anyway. I can't remember off hand what pressure should be but I'll try and dig up a thread.

[Sil240]

Bro Take the CAS out,Have someone spin it, and listen for the injectors.Then take a multimeter to the injector clips.Make sure one of them is power, which is daisy chained to all of them. Then the grounds which come individually from the computer should should go "Ground then open"Use the multimeter to check the continuity of the grounds.

If they are good and you still don't get any fuel then its your injectors.If you do get fuel, your timing may be outta wack

[preston240sx]

well my project is going to be pushed back alittle bit i woke up today to fine my garage door open and my lock cut off they took everything i had for my swap 2 fmic ,,my welder,stero,all my tools, my charge piping ....basically everything i had for swap and car and tools ...............im ready to kill someone