Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-29-2008, 02:40 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Fontana, CA
Posts: 167

Red Egg - '95 Ford Aspire
90 day: 38.51 mpg (US)

Dodge SRT-4 - '04 Dodge Neon SRT-4 2.4L Turbo
90 day: 26.24 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
single wire o2 conversion to 3/4 (heated)

This was discussed on one of the other boards i frequent. Has anyone added this to their 1980s/1990s obd cars and experienced a smoother running during warmup? I think with the colder weather setting in the faster we can get into closed loop the better. My only question, is if the o2 heater is running off 12v or another voltage i have to find (or make) elsewhere in the car? I know that with a single wire sensor, the sensor housing itself is the ground like a spark plug, and it has it's own signal to carry back to the ecu.

__________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-29-2008, 03:24 PM   #2 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,432
Thanks: 178
Thanked 230 Times in 178 Posts
The three-wire O2 sensor will have the signal wire, a power wire, and a ground wire. Hook up those wires to the appropriate things and it should work nicely.

I don't recall if the ground wire is only used to ground the heating element (likely IMHO) or if it also grounds the O2 circuit itself. I think you'd get more variation in the reading with the heating if the ground wire was shared by the sensor and the heater, so I'm guessing that the sensor would still ground through the threads into the exhaust pipe.

I am less sure, but I think a four-wire sensor has heater power, heater ground, signal wire, and sensor ground wire.

-soD
  Reply With Quote
Old 10-29-2008, 03:31 PM   #3 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Fontana, CA
Posts: 167

Red Egg - '95 Ford Aspire
90 day: 38.51 mpg (US)

Dodge SRT-4 - '04 Dodge Neon SRT-4 2.4L Turbo
90 day: 26.24 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
After doing a search, i found that on those more modern vehicles, the ecu does the grounding. Im not sure which 4 wire systems have that property and which do not so i think im better off scoring a 3 wire. It's cheaper at the store anyway. I think i have some 3 wires used at home. Im going to install one of those and if my car behaves the same or better then great. if not then at least i have the oem plug installed and can replace with ease.
__________________
  Reply With Quote
Old 10-29-2008, 06:52 PM   #4 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Mito, Japan
Posts: 106

The Move - '99 Daihatsu Move Aero Down Custom XX
90 day: 29.89 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Send a message via AIM to Dust
subscribing
  Reply With Quote
Old 10-29-2008, 07:02 PM   #5 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 21 Times in 18 Posts
Quote:
Originally Posted by getnpsi View Post
My only question, is if the o2 heater is running off 12v or another voltage i have to find (or make) elsewhere in the car?
From my previous experimentation and failures.... Yes, it's 12V
__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Old 10-29-2008, 07:42 PM   #6 (permalink)
Red
Master EcoModder
 
Red's Avatar
 
Join Date: Mar 2008
Location: SF Bay Area
Posts: 713
Thanks: 1
Thanked 9 Times in 9 Posts
12v ftw
  Reply With Quote
Old 11-19-2008, 03:32 AM   #7 (permalink)
UberNaut
 
metalshark's Avatar
 
Join Date: Nov 2008
Location: where the wind blows
Posts: 21

Verna - '01 Hyundai Accent GS
Thanks: 0
Thanked 0 Times in 0 Posts
I can pretty much guarantee that the more wire running from the o2 sensor the better. looking into wideband o2 sensors I have found that they are used for the ecu or ecm to be able to control the Air to fuel ratio that way efficiency is at its peak.

its all depending on how much your willing to work on it.


never ground to an exhaust pipe unless you want a small fire under the hood the exhaust pipes reach over 600 degrees Fahrenheit.

Last edited by metalshark; 11-19-2008 at 03:38 AM..
  Reply With Quote
Old 12-01-2008, 08:18 PM   #8 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Fontana, CA
Posts: 167

Red Egg - '95 Ford Aspire
90 day: 38.51 mpg (US)

Dodge SRT-4 - '04 Dodge Neon SRT-4 2.4L Turbo
90 day: 26.24 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
o2 sensor is really stuck in the manifold. i have an o2 sensor socket but its a cheapo brand and really starts to bend when i apply a lot of force. Im not going to remove the radiator just to get my impact in there. It's not THAT important
__________________
  Reply With Quote
Old 12-01-2008, 09:23 PM   #9 (permalink)
nut
 
Coyote X's Avatar
 
Join Date: Dec 2007
Location: Southen West Virginia
Posts: 654

Metro XFi - '93 Geo Metro XFi Convertible
90 day: 62.17 mpg (US)

DR650SE - '07 Suzuki DR650SE
90 day: 55.26 mpg (US)
Thanks: 0
Thanked 37 Times in 26 Posts
Send a message via MSN to Coyote X
It depends on the ECU if it is going to help anything with warmup smoothness. But if you do engine off coasting the 1 wire sensors cool down quick and take a few minutes to warm back up even if the engine is at full temp while driving easy. I would suggest using a 4 wire sensor and running the ground back to the ecu to get a lot more accurate signal. On an OBD1 Metro as soon as the water is over 110 degrees I think, and the sensor is reading the car then starts using it.

4 Wire Oxygen Sensor–MetroXFi.com

lot more info on switching to a 4 wire sensor there.
__________________


  Reply With Quote
Old 12-01-2008, 10:05 PM   #10 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Fontana, CA
Posts: 167

Red Egg - '95 Ford Aspire
90 day: 38.51 mpg (US)

Dodge SRT-4 - '04 Dodge Neon SRT-4 2.4L Turbo
90 day: 26.24 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
Yes, for the engine off coasting is why i was addressing the add-on. where i live, we do not get under 40 degrees during the day ever so many of you probably wonder why I even bother with additional "warm-up" techniques, but if i have free parts lying around why not.

__________________
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Perhaps honda specific: Will a code 41 (o2 sensor heater) tank my mileage? SVOboy Off-Topic Tech 13 08-04-2008 09:35 PM
Running "Lean" with a Resistor Divider on the Air Temp Sensor steensn EcoModding Central 22 05-16-2008 09:11 AM
WTB: 1 wire o2 SVOboy For Sale 8 05-11-2008 06:01 AM
DIY - Wire Tuck SVOboy DIY / How-to 4 01-25-2008 02:14 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com