RB25 ECU: No light?

[neonbomb]

Situation:

RB25det Neo in s14. Car wont start. Ignitors read 12, proper fuel (stock FPR, pressure unknown).

Now i know this is either an ECU or Wiring Harness problem. The ECU is from a Laurel or Stagea (i forget which one also had neo headed 25s), but it has no LED light on it indicating that its getting power. The car has all accessories and turns over.

Ive heard of people frying their ignitor boards on the ecu which will make the coils not fire, but that shouldnt apply here because of the voltage reading.

Everyone ive talked to on the phone and through skylineaussie says its my wiring job. What do you all think, mainly mark and bumble in this car

[FAST-DATSUN]

DO you have 12v to the coils with the Key-on??? when you carnk the engine do the injector work???

[neonbomb]

Yes the coils have power with keyon (which i heard they should have a constant 12 in that case)

I actually did not check my injectors with my new CAS actually Mack so i will try that. My old CAS was damaged and wouldnt fire injectors.

Ill try that after work.

Any other ideas / resolutions?

[mello88]

You need to confirm if you have spark and fuel.

Pull a coil pack out, but leave it plugged in, throw a spark spark plug in it and ground the plug... Crank the motor (or rotate the CAS by hand) to see if the plug is firing.

Next crank the motor with one of the spark plugs/coilpacks removed, you'll see the air/fuel mix spray out (no smoking or open flames LOL) so you know injectors are working (or just smell a plug for fuel after cranking if you wanna be all safe about it...).

If you have spark and fuel then it's just a timing issue, your CAS is not stabbed right and/or your timing off. If there's no spark or fuel then it's probably wiring, cas, etc... But verify spark/fuel first.

[Carl H]

did the fuel pump kick on?does your check engine light flash on?check fuel lines for reversal.

[neonbomb]

Well for future reference to Neo owners, we dont have lights on our ECU (theres a window, but no LED).

The rest is a mystery

[mello88]

s2 RB25 doesn't have lights either. You have to short CHK and IGN wires together for 2 seconds to flash the codes out the CEL. Neo might be the same, check out your FSM

Did you try the above tests to see if you're getting fuel and spark?