Calling All Wiring Experts 26/30 Wiring Issue

[James_03]

Hey guys,

Wiring up a 26/30 into my r31. Now I wired up the 25/30 I had in there previously and it was sweet.

I have the 26 loom all hooked up, the ign and ECCS relays switch on with reds on, fuel pump primes then switches off. Now the issue is that the injectors are not firing when cranking. If I take the CAS out and spin it I can hear the injectors firing fine. If I then put the CAS but in and crank the motor it will run very briefly until it runs out of fuel again. Spark is fine as it ignites the remaining fuel from when I spun the CAS.

Does anyone have any ideas? Checked spark on cranking just to be sure and its sweet. So yeah running out of ideas, bloody injectors just wont fire when cranking.

This is one of those things again which is hard to give advice on unless your right there infront of it but for those of you that have done this conv before thought it may be worth a shot.

Edit: Read on Meggala's site but that he ran s5 rx7 injectors in his r33 with just the resistor pack removed so must be all good.

Cheers.

Edited July 22, 2007 by James_03

[rob82]

Hey guys,

Wiring up a 26/30 into my r31. Now I wired up the 25/30 I had in there previously and it was sweet.

I have the 26 loom all hooked up, the ign and ECCS relays switch on with reds on, fuel pump primes then switches off. Now the issue is that the injectors are not firing when cranking. If I take the CAS out and spin it I can hear the injectors firing fine. If I then put the CAS but in and crank the motor it will run very briefly until it runs out of fuel again. Spark is fine as it ignites the remaining fuel from when I spun the CAS.

Does anyone have any ideas? Checked spark on cranking just to be sure and its sweet. So yeah running out of ideas, bloody injectors just wont fire when cranking.

This is one of those things again which is hard to give advice on unless your right there infront of it but for those of you that have done this conv before thought it may be worth a shot.

Cheers.

Check the data with a scantool or watch the tacho and see if you have an rpm signal if you do then you should have both fuel and ignition pulse. If not then I would check fuses as the other side of the injectors is battery fed. It will be wried the exact same way as a rb26 - should be simple - so look for silly mistakes.

[MrMike]

Sounds like you are losing power to your injectors under cranking check with an led test light

have to agree with rob it will deffinately be something simple......

sounds stupid but make sure the 10mm on the wiring harness of the ecu plug is tight........im an auto electrician and i chased a problem nearly identical to yours on a rb25 conversion in a R31 for about an hour only to find i forgot to do up that stupid bolt.....

Good luck.....you'll sort it out

[James_03]

Yeah cheers guys, rigged up a led test light last night, LED will flash strong when spinning the CAS and also whilst cranking. Just wont fire, keep checking spark and its good.

So yeah dunno. I am running rx7 s5 550's in it with the resistor pack removed. Im starting to think that the GTR ecu even with the resistor pack removed is not capable or running high imp injectors. If that was the case but I would have expected a weak LED signal. But yeah all seems to be well, have checked all the ground pin-outs at the ECU and there all good.

[rob82]

Yeah cheers guys, rigged up a led test light last night, LED will flash strong when spinning the CAS and also whilst cranking. Just wont fire, keep checking spark and its good.

So yeah dunno. I am running rx7 s5 550's in it with the resistor pack removed. Im starting to think that the GTR ecu even with the resistor pack removed is not capable or running high imp injectors. If that was the case but I would have expected a weak LED signal. But yeah all seems to be well, have checked all the ground pin-outs at the ECU and there all good.

Those s5 550cc injectors are absolute shite - I definately wouldn't use them. If they have been sitting around then they might be a little gummed up - try putting the standard injectors back in along with the resistor pack.

[James_03]

yeah true that been told that they can gum up and there also shite.

Problem is I am doing a 26/30 conversion so I dont have a spare set up GTR injectors laying around. I have the resistor pack so I might have to go grab some.

One question tho someone may be able to answer, when cranking the motor should the red status LED on the ecu go out?

When cranking the motor on myn the LED will go out, then come back on again when you have stopped cranking. I thought that was unusual.

Cheers.

[James_03]

Got it was missing the start signal 12v live of the standard 31 loom.

Started first time then but ran like shit, look like 2 of my rx7 injectors are still f**ked. I blame the rotor.