O2 Sensor Voltage To Lean Out - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 06-21-2008, 05:45 PM   #1
Registered Member
 
Join Date: Jun 2008
Posts: 4
Country: United States
Question O2 Sensor Voltage To Lean Out

I tried posting this in the General forum but got no answer so ill try it here...

I have a 2002 Chevy S10 and I just added an HHO Unit.. I want to add a voltage enhancer to lean out the fuel mixture... Here is my dilemma, a few weeks ago my Check Engine Light came on... After getting it read by autozone they said that both of my pre cat sensors are bad... Now here is my question...

Do I need to replace the O2 Sensors before adding the enhancer or can I just leave them alone and add the enhancer... If I am reading the instructions to the enhancer correctly, by adding the unit I am bypassing the O2 sensor to begin with... Please correct me if I am wrong?

thanks love the site

Dan
__________________

InADream is offline   Reply With Quote
Old 06-21-2008, 08:31 PM   #2
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
the answer is I don't know but I figured I post since no one else is.

I would suspect since your back two oxy sensors aren't working then you are running in open loop which is causing you to run on a pre programmed fuel map which means you are probably running rich. not stupid rich but richer than normal. when I am running normally I am running 14.7:1 and when I go into open loop it hits 12.5:1 for the air fuel ratio.

I figure your gas mileage is probably worse than it could be if they were changed. if it were me (and it's not) I would change them first just to get a good baseline before changing anything. also realize that if you lean out your mixture too much you may damage your engine. that isn't worth a few mpg for a little while.

BTW: I have a 2.2 liter and I know some of the s-10s had them as well.

when you get everything straight, start a gas log, we would love to see your progress.

side note: I am trying to be more positive.
__________________

__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 06-21-2008, 09:17 PM   #3
Registered Member
 
Join Date: Jun 2008
Posts: 4
Country: United States
Thanks BEEF for replying.. My S10 is a 4.3L V6, I have a baseline for what my truck was running before the O2 sensors went bad... I was getting 15 MPG before the failure of sensors... That is what my truck runs stock, I have no improvements what so ever... I will probably order new sensors this week as well as the enhancer... I was just thinking about saving some money and putting it towards other addons...

Thanks again BEEF, anyone else?

Dan
InADream is offline   Reply With Quote
Old 06-22-2008, 05:55 AM   #4
Registered Member
 
GasSavers_Erik's Avatar
 
Join Date: Nov 2006
Posts: 1,027
Country: United States
I don't have one of these units, but from what I've read they add bias to the oxygen sensor readout, so they do need to be hooked up to the oxygen sensor. The enhancers just fudge the oxygen sensor's signal a little bit to make the engine run leaner. So yes- you do need an operational oxygen sensor for it to work properly.

If you put then enhancer on with no oxygen sensor, either it won't add any bias because it has nothing to work from, or your computer will think that the oxygen sensor is bad and the check engine light will come on and your will be back where you are now.

I doubt that you will hurt anything by adding the enhancer in to the bad oxygen sensors that you have now. If your check engine light goes off afterward then it probably is working.
GasSavers_Erik is offline   Reply With Quote
Old 06-26-2008, 04:32 PM   #5
Registered Member
 
ShadowWorks's Avatar
 
Join Date: May 2008
Posts: 172
Country: United States
A bad Lambda or O2 sensor will give a lower voltage so you don't need the extra resistor to lean the fuel out, you need to check the voltage on the O2 sensor to be sure, 5 volts is the norm I think when its fully warmed up.
__________________
Water is fuel, I just don't know how to make it work yet.
ShadowWorks is offline   Reply With Quote
Old 06-27-2008, 07:27 AM   #6
Registered Member
 
Rower4VT's Avatar
 
Join Date: Jan 2008
Posts: 60
Country: United States
About 0.45 is normal for a warmed up O2 sensor on an older car. Some newer cars with "wideband" O2 sensors, may be closer to the 5V range.
__________________
[SIGPIC][/SIGPIC]
E85 ~$3.17/gal.
Rower4VT is offline   Reply With Quote
Old 06-27-2008, 09:17 AM   #7
Registered Member
 
ShadowWorks's Avatar
 
Join Date: May 2008
Posts: 172
Country: United States
Quote:
Originally Posted by Rower4VT View Post
About 0.45 is normal for a warmed up O2 sensor on an older car. Some newer cars with "wideband" O2 sensors, may be closer to the 5V range.
Does the wide band sensor have some kind of voltage get the voltage higher?
__________________
Water is fuel, I just don't know how to make it work yet.
ShadowWorks is offline   Reply With Quote
Old 06-27-2008, 02:15 PM   #8
Registered Member
 
Join Date: Jun 2008
Posts: 4
Country: United States
Thanks guys, I just got finished probing my 02 sensor and my car is running at about .85 after warmup... It oscillates between .20 and .85 and is hesitating real bad now... I turned the hho unit on and the idle leveled out... So i think i am going to be ok since it is already running lean and seems to work with the hho unit.. Now to see if my mpg improves... I also have the COSM IIA on standby in case it goes on the rich side... I should have my MAF Enhancer done tonight..

Dream
InADream is offline   Reply With Quote
Old 06-28-2008, 05:42 PM   #9
Registered Member
 
Join Date: Jun 2008
Posts: 38
Country: United States
Quote:
Originally Posted by InADream View Post
Thanks guys, I just got finished probing my 02 sensor and my car is running at about .85 after warmup... It oscillates between .20 and .85 and is hesitating real bad now... I turned the hho unit on and the idle leveled out... So i think i am going to be ok since it is already running lean and seems to work with the hho unit.. Now to see if my mpg improves... I also have the COSM IIA on standby in case it goes on the rich side... I should have my MAF Enhancer done tonight..

Dream

We anxiously await your detailed findings!!

__________________
joeventura is offline   Reply With Quote
Old 06-28-2008, 07:29 PM   #10
Registered Member
 
Join Date: May 2008
Posts: 9
Country: United States
Hho Info

Quote:
Originally Posted by InADream View Post
I tried posting this in the General forum but got no answer so ill try it here...

I have a 2002 Chevy S10 and I just added an HHO Unit.. I want to add a voltage enhancer to lean out the fuel mixture... Here is my dilemma, a few weeks ago my Check Engine Light came on... After getting it read by autozone they said that both of my pre cat sensors are bad... Now here is my question...

Do I need to replace the O2 Sensors before adding the enhancer or can I just leave them alone and add the enhancer... If I am reading the instructions to the enhancer correctly, by adding the unit I am bypassing the O2 sensor to begin with... Please correct me if I am wrong?

thanks love the site

Dan
The best place to ask that question would be http://hhoinfo.ning.com

Gabet123
__________________

gabet123 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tail pipe restrictor test GasSavers_Erik Experiments, Modifications and DIY 36 06-14-2008 07:09 PM
New Japanese Crap Request Thread SVOboy General Discussion (Off-Topic) 10 07-01-2007 04:34 PM
Conversion successful Matt Timion Fuelly Web Support and Community News 12 05-18-2006 03:24 PM
Electric panel heaters GasSavers_JustMe General Discussion (Off-Topic) 0 01-03-2006 04:43 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:48 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.