O2 sensor problems - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Amish240coupe · 04-17-2005, 04:40 PM

Hi, I'm new to this forum, didnt really try a search on this at all. But there is one thing I'm curious about. I have a hotshot header, OEM spec cat, and an HKS hiper cat-back, not sure if that means anything, When they installed the exhaust, they cut the ground strap for the O2 sensor, I didnt notice untill today. I was trying to figure out why my A/f guage was acting retarded, ran out of options till I thought about the ground strap. I couldnt get the bolt off of the heat sheild so I created a new ground on my frame rail and attached it to my Cat, but the A/F guage is still acting retarded, and I dont know why because I just replaced it about 2-3 weeks ago. By the way, I also have my guage wired into the wire immediatly off of the sensor, I couldn't find the wire to attach it to the ECU. Any suggestions?

Amish240coupe · 04-17-2005, 04:41 PM

by the way, when I say the guage acts retarded, I mean that only the first LED shines bright, all others are dim. and I can only see 2-3 bars of green ONLY at night.

projectRDM · 04-17-2005, 08:27 PM

The ground strap is not for the oxygen sensor.

Gauge sounds bad, but those type are typically inaccurate as hell anyway.

syco3d · 04-18-2005, 12:47 AM

The a/f gauges rn't always that innacurate, it's just they were made for 4 wire wide bands ... not our crappy 2 wire pos O2 sensors.

So did you notice the gauge acting stupid IMMEDIATLY after the exaust install, or sometime after?

Amish240coupe · 04-18-2005, 01:40 PM

I had the exhaust put on before the guage...I was thinking of going wideband, but I dont really need to spend $400 on a ka24de non turbo with only moderate upgrades. But I did notice when I made that afro-engineered ground, the lights got a bit brighter

04-17-2005, 04:40 PM	#1
Amish240coupe Join Date: Apr 2005 Location: Lancaster,PA Age: 43 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	O2 sensor problems Hi, I'm new to this forum, didnt really try a search on this at all. But there is one thing I'm curious about. I have a hotshot header, OEM spec cat, and an HKS hiper cat-back, not sure if that means anything, When they installed the exhaust, they cut the ground strap for the O2 sensor, I didnt notice untill today. I was trying to figure out why my A/f guage was acting retarded, ran out of options till I thought about the ground strap. I couldnt get the bolt off of the heat sheild so I created a new ground on my frame rail and attached it to my Cat, but the A/F guage is still acting retarded, and I dont know why because I just replaced it about 2-3 weeks ago. By the way, I also have my guage wired into the wire immediatly off of the sensor, I couldn't find the wire to attach it to the ECU. Any suggestions?

04-17-2005, 08:27 PM	#3
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	The ground strap is not for the oxygen sensor. Gauge sounds bad, but those type are typically inaccurate as hell anyway. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

04-18-2005, 12:47 AM	#4
syco3d Zilvia Junkie Join Date: Dec 2002 Location: Topeka, Ks Age: 41 Posts: 363 Trader Rating: (0) Feedback Score: 0 reviews	The a/f gauges rn't always that innacurate, it's just they were made for 4 wire wide bands ... not our crappy 2 wire pos O2 sensors. So did you notice the gauge acting stupid IMMEDIATLY after the exaust install, or sometime after? __________________ Gimme a "A"! Gimme a "P"! Gimme a "C"! What does that spell? CRAP!

04-17-2005, 04:41 PM	#2
Amish240coupe Join Date: Apr 2005 Location: Lancaster,PA Age: 43 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	by the way, when I say the guage acts retarded, I mean that only the first LED shines bright, all others are dim. and I can only see 2-3 bars of green ONLY at night.

04-18-2005, 01:40 PM	#5
Amish240coupe Join Date: Apr 2005 Location: Lancaster,PA Age: 43 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	I had the exhaust put on before the guage...I was thinking of going wideband, but I dont really need to spend $400 on a ka24de non turbo with only moderate upgrades. But I did notice when I made that afro-engineered ground, the lights got a bit brighter