Question on O2s - Page 3 - 3000GT/Stealth International Message Center

Aaron · 05-13-2008, 07:34 AM

Whats scary is this shop does a lot of work on 3000gt/ stealths. they had 5 there while i was there

lawdogg · 05-13-2008, 07:41 AM

Yikes man. I don't know if you should take your car back there, ever.

Tool Man · 05-13-2008, 07:45 AM

Quote:

Originally Posted by Hannibalzero

By the way Kevin, I have been driving around on one O2 sensor for almost two weeks now. Still no CEL.

Good news, good news

slasher48 · 10-10-2008, 10:11 PM

Hi, wanted to see if there have been any updates about running on one sensor or splitting one to both inputs.

I tried splitting one sensor into 2 inputs a few years back on a 2jz-ge, but that didn't work out. Triggered a CEL. Probably b/c of the issues that lawdogg mentioned, but the ecu also controls closed loop fuel individually between 2 "banks" of 3 cyl ea.

Wasn't sure if the 3/S ECU also did separate closed loop fuel trims for the 2 banks, or if a second sensor is just a redundancy feature in case one goes out.

In electronics, we used directional couplers with tap ports to measure lines with negligible impact on the main signal levels, so the 1 into 2 thing probably isn't going to work out because of voltage splitting.

Tool Man · 10-11-2008, 05:46 AM

Most people have been splitting and running 2. I've driven around the block a few times with just the one hooked up and haven't thrown one yet. I'm going to start driving it regularly this coming week, so I guess I'll see then.

VR4-GASM · 10-11-2008, 08:54 PM

I'm using my NA harness, which only has one O2 sensor. As well as a '91 TT ECU and I haven't had any problems with it. I do have a CEL that came on about 4 days after I finished the conversion.

I'm betting it's from having no cats and/or no EGR. The car runs fine otherwise.

BigTyla · 10-11-2008, 09:37 PM

I've been running just the rear o2 sensor for over a year. I split it so that the ECU would read two signals. It's been running fine in normal driving but when datalogging my o2 signal drops to 0.05 V at idle and also seems slow to respond when going WOT. This could have something to do with splitting the wire which causes a current drop.

I'll most likely be hooking up a front o2 sensor to compliment the rear. Who knows, maybe my rear o2 is just going bad and it has nothing to do with the wiring.

05-13-2008, 07:34 AM	#21 (permalink)
Aaron Forum Member Join Date: Oct 2005 Location: Sandwich, Mass Drives: 1995 3000gt Trader Rating: (0)	Re: Question on O2s Whats scary is this shop does a lot of work on 3000gt/ stealths. they had 5 there while i was there __________________ 1995 3000gt Base, Just completed my engine rebuild and MTX swap Mods: Long tube headers, 2.5" Magnaflow high flow cat, 2.5" single in dual out Flowmaster 40 series muffler, true cold air intake, throttle body spacer, upper plenum spacer, stage 3 heads, Underdrive pulley, Short throw shifter and more Ext. Mods: HID headlights, 20% black window tint, 18" black w/chrome lip rims, 245/40/zr18 low profile tires, 2 3.5" chrome exhaust tips Int. Mods. Jenson in-dash DVD player, Alpine 12 sub, Alpine amp, blue lights

05-13-2008, 07:41 AM	#22 (permalink)
lawdogg Here for the tuna. Join Date: Jul 2003 Location: Williamsport, PA Drives: The Speed Limit Trader Rating: (65)	Re: Question on O2s Yikes man. I don't know if you should take your car back there, ever. __________________ 94 VR-4: 11.8 @ 116, 17psi, pump, 13Ts

10-10-2008, 10:11 PM	#24 (permalink)
slasher48 Verified Seller Join Date: Apr 2001 Drives: Various Trader Rating: (5)	Re: Question on O2s Hi, wanted to see if there have been any updates about running on one sensor or splitting one to both inputs. I tried splitting one sensor into 2 inputs a few years back on a 2jz-ge, but that didn't work out. Triggered a CEL. Probably b/c of the issues that lawdogg mentioned, but the ecu also controls closed loop fuel individually between 2 "banks" of 3 cyl ea. Wasn't sure if the 3/S ECU also did separate closed loop fuel trims for the 2 banks, or if a second sensor is just a redundancy feature in case one goes out. In electronics, we used directional couplers with tap ports to measure lines with negligible impact on the main signal levels, so the 1 into 2 thing probably isn't going to work out because of voltage splitting.

10-11-2008, 05:46 AM	#25 (permalink)
Tool Man VA 3S Join Date: Sep 2003 Location: Virginia Drives: 94 3000GT NA Trader Rating: (27)	Re: Question on O2s Most people have been splitting and running 2. I've driven around the block a few times with just the one hooked up and haven't thrown one yet. I'm going to start driving it regularly this coming week, so I guess I'll see then.

10-11-2008, 08:54 PM	#26 (permalink)
VR4-GASM Verified Seller Join Date: Jul 2005 Location: Lehigh Valley, PA Drives: other ppl's cars Trader Rating: (10)	Re: Question on O2s I'm using my NA harness, which only has one O2 sensor. As well as a '91 TT ECU and I haven't had any problems with it. I do have a CEL that came on about 4 days after I finished the conversion. I'm betting it's from having no cats and/or no EGR. The car runs fine otherwise. __________________ 1995 3000GT Base BPU+ (10:1 @ 10psi) HKS, Apex-i, GReddy, AEM, K&N, Stillen, ACT, 3SX Performance, Maximal Performance, Ground Zero Performance. 500+ FWHP soon to be in the works

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10-11-2008, 09:37 PM	#27 (permalink)
BigTyla Resident rocket scientist Join Date: Nov 2002 Location: Auburn, AL Drives: '93 3000GT ATX TT Trader Rating: (179)	Re: Question on O2s I've been running just the rear o2 sensor for over a year. I split it so that the ECU would read two signals. It's been running fine in normal driving but when datalogging my o2 signal drops to 0.05 V at idle and also seems slow to respond when going WOT. This could have something to do with splitting the wire which causes a current drop. I'll most likely be hooking up a front o2 sensor to compliment the rear. Who knows, maybe my rear o2 is just going bad and it has nothing to do with the wiring. __________________ Topline Engineering - "Driven to Perfection" 1993 3000GT FWD ATX TT - mods coming<---------------->2009 Honda Fit - 40 mpg ftw Topline Engineering ground wire kit Nov/Dec ground wire GB!!!