Injectors 2,4,6 Have No Pulse.

[Spinning]

I have a problem and was wondering if any one could help me out please!

Injectors 2,4 and 6 do not have injector pulse. 1,3 and 5 do and are fine. All 6 injectors have power. I've checked the 3 ground wires at the ecu and are all reading they are earthed. I've gone around the engine bay and double/triple checked earth points. I can only see the problem as a bad earth problem but would like some feed back.

The engine is a Rb25/30 using a rb20 loom and ecu(nistune), also using all rb20 components. The engine is running just rough, can hold idle though. The only things I don't have plumbed in is the intercooler/pipes and the afm.

Help would be greatly appreciated!

[89CAL]

I dont have an rb20 wiring diagram but the rb25 wiring shares a common power feed between all 6 injectors and all are separately grounded through the ECU. Any reason why you are using an rb20 harness? More curious then anything.

I would put a meter on it and check the wires are going to the right place on the ECU. And also make sure that there isnt a break in the circuit. Also check that they are all getting a good circuit from the Ignition relay

If this is fine then you will need to look at the ECU side. Is the ECU being grounded properly (what sort of ECU is it, is it setup correctly?)

[Duncan]

Wow, this is an odd problem!

[Duncan]

more helpfully though, are you using the rb26 resistor pack (or maybe rb20 has one too?) You might just have simple bad wiring there

[Spinning]

I'm using the rb20 loom because it's the simplest way of going about it, I'm not running vct and I'm using all the rb20 sensors. I've previously had the ecu(nistune) tuned with my rb20 before it decided it wanted to die. I forgot to ad it's in a r32 if you Havn't already guessed.

Ahhh okay, on the diagrams I can find the rb20 computer only has 3 injector grounds.

I'll have another look tonight after work and see if I can solve it. Thanks guys..

Edited October 27, 2015 by Spinning

[Sinista32]

Does it use a PTU (Ignitor) ?

[blind_elk]

Duncan, RB20DET doesn't use a resistor pack.

Sinista, only the coils utilise a PTU.

RB20DET ECU grounds injectors through pins 101 (1), 105 (2), 103 (3), 112 (4), 110 (5), 114 (6). Pins 107 / 108 connect the injectors through the ECU internals to earth.