RB25 S14 Problems - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

FinkenS14 · 09-30-2009, 11:08 AM

OK so my RB25 S14 has had this problem ever since I swapped it.
After I get in it, sometimes the throttle doesnt respond to any input, and it slowly goes away, but I have to be out of the throttle for that time, or change gears helps. It also does it around corners, it just cuts out, then catches again.

I made sure it wasnt my walbro pump. I put the stock sock back on it, and made sure everything was tight and it has power going to it.
One thing I noticed tho when I spliced in the harness for the new pump, I just used butt connectors, but didnt seal them in any way, shud I seal them with shrink wrap or something?

Also, when I did my harness conversion I read that the power wire for the injectors had to be given a direct key on 12v source. So what I did was tapped into my ignition relay by the ECU. I kinda rigged it and just stuck it into the part of the relay where the wires go in, wrapped it in electrical tape, and called it good? Shud I change this?

Also the few times Ive tryed pushing the car past 10psi it just sputters, and backfires.
Any help wud be rgeat guys, thanks.

WizardBlack · 10-04-2009, 05:54 PM

You 'shud' fix the wiring.

GSXRJJordan · 10-04-2009, 06:39 PM

Quote:

Originally Posted by FinkenS14

OK so my RB25 S14 has had this problem ever since I swapped it.
After I get in it, sometimes the throttle doesnt respond to any input, and it slowly goes away, but I have to be out of the throttle for that time, or change gears helps. It also does it around corners, it just cuts out, then catches again.

I made sure it wasnt my walbro pump. I put the stock sock back on it, and made sure everything was tight and it has power going to it.
One thing I noticed tho when I spliced in the harness for the new pump, I just used butt connectors, but didnt seal them in any way, shud I seal them with shrink wrap or something?

Also, when I did my harness conversion I read that the power wire for the injectors had to be given a direct key on 12v source. So what I did was tapped into my ignition relay by the ECU. I kinda rigged it and just stuck it into the part of the relay where the wires go in, wrapped it in electrical tape, and called it good? Shud I change this?

Also the few times Ive tryed pushing the car past 10psi it just sputters, and backfires.
Any help wud be rgeat guys, thanks.

Given what you've typed, I would say the problem could be a lot of places.

If your fuel pump wiring is not 100%, you will have a very difficult to diagnose problem with getting on the gas, due to low fuel pressure at times. I would make sure that every wire, at every junction, is 100% mechanically and electrically secure.

Your problem could also be with your upper engine harness. It's true that Nissan wires their injectors to constant/fused +12V on the hot side and switches the ground, and if you correctly spliced the injector power wire into either pin 3 or 5 of the ECU relay, the injectors should fire normally. I'd be betting that the problem is elsewhere in the harness, and could definitely be an intermittent ground or sensor-ground problem.

Like I said, difficult to diagnose, lots of possible causes. If you wanted to send the harness out to get it checked I could eliminate the upper harness as a cause and clean up your wiring, but I can't inspect the whole car's body harness or grounds from afar.

FinkenS14 · 10-13-2009, 03:58 PM

Well seeing as how my whole ahrness is put together with butt connectors thats the first thing Im fixing, and soldering and shrink wrapping everything.

09-30-2009, 11:08 AM	#1
FinkenS14 Zilvia Member Join Date: Oct 2008 Location: Denver, Colorado Age: 32 Posts: 177 Trader Rating: (0) Feedback Score: 0 reviews	RB25 S14 Problems OK so my RB25 S14 has had this problem ever since I swapped it. After I get in it, sometimes the throttle doesnt respond to any input, and it slowly goes away, but I have to be out of the throttle for that time, or change gears helps. It also does it around corners, it just cuts out, then catches again. I made sure it wasnt my walbro pump. I put the stock sock back on it, and made sure everything was tight and it has power going to it. One thing I noticed tho when I spliced in the harness for the new pump, I just used butt connectors, but didnt seal them in any way, shud I seal them with shrink wrap or something? Also, when I did my harness conversion I read that the power wire for the injectors had to be given a direct key on 12v source. So what I did was tapped into my ignition relay by the ECU. I kinda rigged it and just stuck it into the part of the relay where the wires go in, wrapped it in electrical tape, and called it good? Shud I change this? Also the few times Ive tryed pushing the car past 10psi it just sputters, and backfires. Any help wud be rgeat guys, thanks. __________________ 95 S14-RB26DETT

10-13-2009, 03:58 PM	#4
FinkenS14 Zilvia Member Join Date: Oct 2008 Location: Denver, Colorado Age: 32 Posts: 177 Trader Rating: (0) Feedback Score: 0 reviews	Well seeing as how my whole ahrness is put together with butt connectors thats the first thing Im fixing, and soldering and shrink wrapping everything. __________________ 95 S14-RB26DETT

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10-04-2009, 05:54 PM	#2
WizardBlack Join Date: Sep 2007 Location: Ohio Age: 44 Posts: 30 Trader Rating: (0) Feedback Score: 0 reviews	You 'shud' fix the wiring.