S14 SR20DET - o2 Sensor issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Steve13 · 12-31-2019, 05:40 AM

Hey guys,

I have a S13 running a S14 SR20det. Been chasing an issue for a while now. At part throttle (trying to maintain speed, any speed, any gear), It's a bit lumpy and running a bit strange, yet runs fine on full throttle and idle.

I've replaced the o2 sensor because when I unplugged it, it ran fine. However with new o2 sensor in, it does the same thing. But unplugged is fine.

I've been trying to find some info on how it earths etc, because when I have the key in the on position, i'm getting 12v at one of the wires. However I can't seem to pick up an earth on the other one. According to my continuity test both wires run back to the ecu. One goes to pin 115 and the other goes to pin 110 which is also Fuel Injector 2 Drive Input (according to wiring specialties pinout on their website). Anyone shed some light on where it gets it's earth from or if it sounds like a different issue altogether? Starting to think my ecu has failed.

Does have a wiringspecialties harness
Has a WC ECU in it

Any help would be appreciated

Thanks

S14rebuild · 01-01-2020, 05:15 PM

Email yuri a w.s. best around and will gladly help you, give u pin tests and wiring diagrams

Steve13 · 01-05-2020, 06:40 PM

Found the issue i believe, for anyone that may run into similiar issues. Had the car up on axle stands doing some suspension upgrades, in between i found a loose earth on the intake, redid a group on earths that bolt to the front of the frame infront of the pod filter area, and maf was filthy.. covered in dust and debri and i had it mounted upside down to try and clean engine bay. Used a maf cleaning product to clean it up and clean the housing up. Plugged o2 sensor back in, drives like a dream. Not sure which one was the culprit but have my suspicion.

jedi03 · 01-06-2020, 09:09 AM

nice! glad was simple issue!@ never hurts to add more grounds!

12-31-2019, 05:40 AM	#1
Steve13 Join Date: Dec 2019 Location: Australia Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	S14 SR20DET - o2 Sensor issue Hey guys, I have a S13 running a S14 SR20det. Been chasing an issue for a while now. At part throttle (trying to maintain speed, any speed, any gear), It's a bit lumpy and running a bit strange, yet runs fine on full throttle and idle. I've replaced the o2 sensor because when I unplugged it, it ran fine. However with new o2 sensor in, it does the same thing. But unplugged is fine. I've been trying to find some info on how it earths etc, because when I have the key in the on position, i'm getting 12v at one of the wires. However I can't seem to pick up an earth on the other one. According to my continuity test both wires run back to the ecu. One goes to pin 115 and the other goes to pin 110 which is also Fuel Injector 2 Drive Input (according to wiring specialties pinout on their website). Anyone shed some light on where it gets it's earth from or if it sounds like a different issue altogether? Starting to think my ecu has failed. Does have a wiringspecialties harness Has a WC ECU in it Any help would be appreciated Thanks

01-01-2020, 05:15 PM	#2
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,495 Trader Rating: (8) Feedback Score: 8 reviews	Email yuri a w.s. best around and will gladly help you, give u pin tests and wiring diagrams

01-05-2020, 06:40 PM	#3
Steve13 Join Date: Dec 2019 Location: Australia Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Found the issue i believe, for anyone that may run into similiar issues. Had the car up on axle stands doing some suspension upgrades, in between i found a loose earth on the intake, redid a group on earths that bolt to the front of the frame infront of the pod filter area, and maf was filthy.. covered in dust and debri and i had it mounted upside down to try and clean engine bay. Used a maf cleaning product to clean it up and clean the housing up. Plugged o2 sensor back in, drives like a dream. Not sure which one was the culprit but have my suspicion.

01-06-2020, 09:09 AM	#4
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,836 Trader Rating: (8) Feedback Score: 8 reviews	nice! glad was simple issue!@ never hurts to add more grounds!