SR injector not firing, getting +12v and shows continuity to ECU? WTF - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Anto · 04-10-2008, 01:21 PM

Alright, I'm helping a friend out with his SR wiring and there's an odd problem we're having.

Motor is a s14 Zenki SR with a Nissan remanufactured ECU.

Injector #1 isn't firing. There's +12v going in and there's continuity between the ECU and the injector, so I know there's a power and ground.
We pulled the injector clip out while the engine was running and NOTHING.

-The injector is good. We originally thought it was the culprit and replaced it with one from a low mileage, working SR motor. Tested within FSM spec, 10.2 ohms resistance. We attached to a 9v battery while it was on the car, and it started to bog & smoke started pouring out, so I know the injector isn't seized.

-There's spark, I tested the coilpack and I can see the huge spark grounding out to the motor. I replaced it with a working one just in case.

-I removed the coilpack and cranked the motor, and looked inside the cylinder. No fuel on the cylinder or on the plug.

-Injector plug & harness look fine. No bent prongs, recessed terminals, nothing. I tried wiggling it while it was running and still got nothing.

- I ghetto rigged some wires directly from the plug to the injector, but it still wasn't firing. I don't know if it made a connection, but i'm going to try that again later.

WTF is the problem? It seems like it would be in the plug but I'm getting nothing.

04-10-2008, 01:21 PM	#1
Anto Zilvia Addict Join Date: Jan 2006 Location: California Posts: 862 Trader Rating: (2) Feedback Score: 2 reviews	SR injector not firing, getting +12v and shows continuity to ECU? WTF Alright, I'm helping a friend out with his SR wiring and there's an odd problem we're having. Motor is a s14 Zenki SR with a Nissan remanufactured ECU. Injector #1 isn't firing. There's +12v going in and there's continuity between the ECU and the injector, so I know there's a power and ground. We pulled the injector clip out while the engine was running and NOTHING. -The injector is good. We originally thought it was the culprit and replaced it with one from a low mileage, working SR motor. Tested within FSM spec, 10.2 ohms resistance. We attached to a 9v battery while it was on the car, and it started to bog & smoke started pouring out, so I know the injector isn't seized. -There's spark, I tested the coilpack and I can see the huge spark grounding out to the motor. I replaced it with a working one just in case. -I removed the coilpack and cranked the motor, and looked inside the cylinder. No fuel on the cylinder or on the plug. -Injector plug & harness look fine. No bent prongs, recessed terminals, nothing. I tried wiggling it while it was running and still got nothing. - I ghetto rigged some wires directly from the plug to the injector, but it still wasn't firing. I don't know if it made a connection, but i'm going to try that again later. WTF is the problem? It seems like it would be in the plug but I'm getting nothing.