Question on O2s - Page 2 - 3000GT/Stealth International Message Center

green-lantern · 05-07-2008, 12:44 PM

I would just do it right the first time and run both of them. I mean how much is an O2 sensor anyway. You will need to mod the harness regardless right?

Tool Man · 05-07-2008, 12:47 PM

I have 3 holes in the DP, one at the precat, one between the precat and the Y (Both of these are plugged) and one in the rear where the NA O2 is. Why would I need to modify the harness if I'm only using the rear?

lawdogg · 05-07-2008, 12:48 PM

Because V=IR.

Draw a circuit and I believe you'll see why.

But I don't know ... it's been a while.

Tool Man · 05-07-2008, 12:51 PM

Quote:

Originally Posted by lawdogg

Because V=IR.

Draw a circuit and I believe you'll see why.

But I don't know ... it's been a while.

Completely lost me there, I'm a medic, I can draw you a picture of the heart and how the electrical current flows through it, will that help?

lawdogg · 05-07-2008, 12:55 PM

Quote:

Originally Posted by Tool Man

Completely lost me there, I'm a medic, I can draw you a picture of the heart and how the electrical current flows through it, will that help?

Haha sorry. I was kinda thinking out loud. I don't know for certain why this won't work but I believe that with a single voltage source, each time you split it, the voltage will go down by half. Does that sound right? I'm honestly not sure.

Here is what I meant (MS Paint ftw):

The oxygen sensor is the voltage source, 5V because I thought maybe it could be a 0-5V wideband. Each resistor represents a WB display, or in your case a factory oxygen sensor harness. Now I believe the voltage over each resistor will be half of the voltage from the sensor. In that case, splicing one o2 signal into two harnesses won't work.

Tool Man · 05-07-2008, 01:06 PM

I got ya, I'm going to try running just a single like Mr Hannibal is and see how it goes. If it doesn't work out for me, I'll go ahead and run one from the front. Yeah, I'm lazy, but if it works, look at all of the time It will save everyone else down the road.

Aaron · 05-13-2008, 01:42 AM

I have cali emissions on my car and i bought the long tube headers for it. when i had a shop installed my headers they broke one of my O2 sensors and never told me. So they hooked up two O2 sensor wire to one O2 sensor. The car hasn't really ran the same since. my air to fuel ratio is all messed up, i can never get the car to idle right. Idk if it's because they hooked up two O2 wires to one O2 sensor or is it because maybe they hooked up one pre-cat wire and one after cat wire to the same O2 sensor. Either way i want to get another O2 sensor and rewire all them and see if that solves the problems

lawdogg · 05-13-2008, 06:54 AM

Quote:

Originally Posted by Aaron

I have cali emissions on my car and i bought the long tube headers for it. when i had a shop installed my headers they broke one of my O2 sensors and never told me. So they hooked up two O2 sensor wire to one O2 sensor. The car hasn't really ran the same since. my air to fuel ratio is all messed up, i can never get the car to idle right. Idk if it's because they hooked up two O2 wires to one O2 sensor or is it because maybe they hooked up one pre-cat wire and one after cat wire to the same O2 sensor. Either way i want to get another O2 sensor and rewire all them and see if that solves the problems

Yeah, no es bueno. Get another o2 in there stat. Sounds like they did that with your main o2 sensors, not your cali-spec downpipe sensors.

Hannibalzero · 05-13-2008, 07:29 AM

Quote:

Originally Posted by Aaron

when i had a shop installed my headers they broke one of my O2 sensors and never told me.

Sounds like a hack shop. I'd be more worried about what else they screwed up. Hopefully nothing, but I couldn't think of any shop that would just reqire an 02 sensor when they could easily just install another. If the wiring wasn't there in the first place, that would be different.

Hannibalzero · 05-13-2008, 07:30 AM

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

05-07-2008, 12:47 PM	#12 (permalink)
Tool Man VA 3S Join Date: Sep 2003 Location: Virginia Drives: 94 3000GT NA Trader Rating: (27)	Re: Question on O2s I have 3 holes in the DP, one at the precat, one between the precat and the Y (Both of these are plugged) and one in the rear where the NA O2 is. Why would I need to modify the harness if I'm only using the rear? __________________ Pics of my car, click me!_______ August 2006 ROTM DSM 13Gs, gutted pre-cats, 3" after market downpipe with 3" high flow Cat,Custom 3" stainless steel catback dual exhaust,Modified oil pan & Stainless steel oil return lines,APEXI S-AFC2, Manual Boost Controller, Front and rear Polly mounts. Running waste gate for now ( 7 PSI ) until I get to a Dyno.

05-07-2008, 12:48 PM	#13 (permalink)
lawdogg Here for the tuna. Join Date: Jul 2003 Location: Williamsport, PA Drives: The Speed Limit Trader Rating: (65)	Re: Question on O2s Because V=IR. Draw a circuit and I believe you'll see why. But I don't know ... it's been a while. __________________ 94 VR-4: 11.8 @ 116, 17psi, pump, 13Ts

05-07-2008, 01:06 PM	#16 (permalink)
Tool Man VA 3S Join Date: Sep 2003 Location: Virginia Drives: 94 3000GT NA Trader Rating: (27)	Re: Question on O2s I got ya, I'm going to try running just a single like Mr Hannibal is and see how it goes. If it doesn't work out for me, I'll go ahead and run one from the front. Yeah, I'm lazy, but if it works, look at all of the time It will save everyone else down the road.

05-13-2008, 01:42 AM	#17 (permalink)
Aaron Forum Member Join Date: Oct 2005 Location: Sandwich, Mass Drives: 1995 3000gt Trader Rating: (0)	Re: Question on O2s I have cali emissions on my car and i bought the long tube headers for it. when i had a shop installed my headers they broke one of my O2 sensors and never told me. So they hooked up two O2 sensor wire to one O2 sensor. The car hasn't really ran the same since. my air to fuel ratio is all messed up, i can never get the car to idle right. Idk if it's because they hooked up two O2 wires to one O2 sensor or is it because maybe they hooked up one pre-cat wire and one after cat wire to the same O2 sensor. Either way i want to get another O2 sensor and rewire all them and see if that solves the problems __________________ 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, 07:30 AM	#20 (permalink)
Hannibalzero H to the izzO Join Date: Jan 2003 Location: Northern VA Drives: Recklessly Trader Rating: (55)	Re: Question on O2s By the way Kevin, I have been driving around on one O2 sensor for almost two weeks now. Still no CEL.

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