Oxygen Sensor Voltage - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-14-2001, 09:21 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Oxygen Sensor Voltage

I've really geeked out now. I've spliced into my oxygen sensor wire and ran it into a multimeter to understand how my stock engine/computer is managing my A/F mixture. I'm doing this because my new catalytic converter and muffler seem to be getting way too hot. The floorboard behind my driver's seat is too hot to keep my hand on it after a 20-30 minute drive. Even with a heat shield over the cat.

My questions are (1) Has anyone else looked at their O2 sensor voltages? (2) Or is anyone knowledgeable on the typical readings during on-road driving?

It seems that after everything is warmed up, I consistently run ~0.7V to ~0.75V going down the road. This is indicative of a rich condition, and may explain the overheating exhaust parts.

Any ideas to bring this back to the "normal" 0.4-0.6V range? I've looked at the 258 primer. It only mentions that the sensor may be bad, and I know from the changing voltage that it is functional.

And while I appreciate the advice to go to fuel injection, at this point, I don't have the money. So if anyone has any ideas, I'd like to hear them.

<font color=red>1986 CJ-7, 258, T-5, TR-TFI, Stock
</font color=red>
http://albums.photopoint.com/j/Album...66057&a=110299
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 03-14-2001, 10:42 AM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: Oxygen Sensor Voltage

If the 02 sensor is within normal voltage limits, rich to lean, and the voltage varies, chances are it's good.

Have you looked at the vacuum, or the timing to see if the engine is off timed?


LEVE
LEVE is offline  
post #3 of (permalink) Old 03-14-2001, 10:59 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Oxygen Sensor Voltage

LEVE,

Thanks for the reply. I've seen the sensor voltage vary between ~0.3V to ~0.8V.

My vacuum at idle is ~20 in. Hg. and "stable", and I've set the timing to right at spec (9 deg. at 1600RPM, no vac advance, and no 4" or 10" lines hooked up) and rechecked.

<font color=red>1986 CJ-7, 258, T-5, TR-TFI, Stock
</font color=red>
http://albums.photopoint.com/j/Album...66057&a=110299
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome