I am about to finish my S4 TII swap. I am using a N318 ECU. My problem is that I do have spark, but the injectors are not working at all. I checked the spark plugs and there is no fuel at all on them. I checked the voltage at the ECU and I am getting a reading of less than a volt. (0.45v) I did search for any possible causes but did not find much. Any help would be apprecciated.
Hernan

 

Do you have power through the resister pack and to the injectors?

The ecu grounds them so they fire/squirt.

Have the injectors been cleaned? If you use power and ground jumper wires can you hear the injectors click?

 

I think I need the resistor pack, but I can not find the plug to it. I looked around the MAF, but its not there.

 

trace the injector wires? did you leave the engine harness completely alone?


there is also a small chance that your S4 engine was an '88 which still used injectors w/ square plug ends, but were high impedance (12-13 ohm) and required no resistor pack

 

Well I just checked the injectors and indeed they are purple with square top. So the resistor pack is out of the question now. What else It could be?
Hernan

 

Do you have power to the injectors? Can you hear them clicking? Have they been cleaned? Is the wiring harness stock or modified?

 

^ ditto

if you incorporated the FC's main relay (or not too) you should be able to get battery voltage to the injectors w/ key on. you can test at the injectors themselves, anywhere in the injector harness, or even back probing at the ECU's plug.

how exactly did you go about meshing the engine harness into the chassis wiring?

 

I did not use the FC main relay because I could not find the wiring diagram for the main relay. I checked the voltage at the ECU and had less that one volt.

 

We need more info, what exactly did you do for the swap? The ecu provides the ground for the injectors not the power, so the question is how did you wire in the injectors?

 

I used the EM harness, I did not make any modifications to it, other than the CAS and coils. I did not touch the injectors wires due to the fact that I bought the engine complete with the ECU and harness.

 

When you made your left side (body) harness did you include the fuel pump resistor/injector relay assembly? It's found behind the pass headlight on the fc (at least on s5, s4 should be the same) without it the injectors won't get any power...

 

How the hell is this in the build thread area? Pics?