Rb25 No Spark!

[apl]

Hey guys,

I just finished an rb25 swap into an r32. R32 wiring and r32ecu for the rb25, rb20 ignitor pack, gtr injectors with resistor pack. I have fuel in all cylinders, but only a weak spark on #2 and #3, so spark anywhere else. Any ideas as what the problem could be?

Thanks!

[NYTSKY]

Make sure the engine is properly earthed.

[apl]

Ok. If it is, what else can i try?

Make sure the engine is properly earthed.

[blind_elk]

Are you using the RB25 coils?

And I hope you are getting the ECU re-mapped.

[QWK32]

Are you using the RB25 coils?

And I hope you are getting the ECU re-mapped.

and if you are using the RB25 coils, your wouldn't be using S2 coils with a RB20 ignitor pack would you? what series rb25 is it?

[apl]

The ecu is tuned to run an rb25. Its an r33 rb25. Using the rb20 wiring harness and ignitor. They are splitfire coilpacks which work for r32 or r33s.

I am getting a very small spark on #2 and #3 like i said. I did just move the battery to the trunk, so i tried running the ground wire all the way up to the engine instead of grounding it in the trunk.. no difference. Any ideas?

Edited September 29, 2008 by apl

[blind_elk]

Have you confirmed if it's the coil or the ignitor at fault?

Have you checked all the plugs, and confirmed no bent connector pins?

[apl]

The plugs and coils are good. Ill have to check the ignitor.

Have you confirmed if it's the coil or the ignitor at fault?

Have you checked all the plugs, and confirmed no bent connector pins?

[apl]

I tested the voltages that were going into the ignitor from the ecu.. The fsm says 0.1-0.3v on the input side of the ignitor, and 7-9v on the output. Both when engine is running, but keep in mind all i can do is crank.

#1 33mv (something small)

#2 1.1v

#3 1.1v

#4 1.0v

#5 (something small)

#6 0.75v

There was a very very small spark on #2, #3, and #4. Also the voltages from the output side of the ignitor were no where near 7-9v, they were smaller than the input voltages. A little confused with this as teh ecu is seems to be sending too much voltage and the ignitor isnt doing ****.

[apl]

Forgot to add that the 1.1v i am measuring on the input side of the ignitor are when the ignition is ON and not cranking. wtf?

[abu]

Have you checked the CAS?

[apl]

just checked the cas and its good. im gonna try another ignitor and see whats up.

Have you checked the CAS?

[apl]

The CAS is good. Ive tried 3 ecus. All the wiring is good. Gonna try another ignitor on wednesday. The ignitor is grounded by the little ground wire correct? It doesent actually need to be grounded its self does it?

[apl]

Anyone have any ideas? Very weak spark for some reason. Only partial combustion.

Thanks