O2 sensor should or should not be connected to ?? - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > O2 sensor should or should not be connected to ??

XJ Rail Sale!The Ruffstuff NOT Universal 4 Link Kit!Vanco Big Brake Kit Promotion!

Reply
Unread 03-27-2013, 09:38 AM   #16
YJ-dimi
Registered User
1994 YJ Wrangler 
 
Join Date: May 2007
Location: netherlands
Posts: 21
QUOTE=Que89YJ;15201564]YJ-dimi did you do a battery reset? The PCM stores info and you need to clear it. Also after running rich that long you might want to clean out the IAC. I bet its carboned up pretty good.[/QUOTE]

Hey, yea the battery is always disconnected while it sit through winter. I thought an 8 hour battery disconnect is good enough to clear the memory without any tricks. i think one week will defenitely clear out the memory.

I'll take it out next time i change oils, as i don't have idling issues at the moment. but a good tip is always welcome.

YJ-dimi is offline   Reply With Quote Quick reply to this message
Unread 06-27-2013, 06:10 AM   #17
YJ-dimi
Registered User
1994 YJ Wrangler 
 
Join Date: May 2007
Location: netherlands
Posts: 21
after some driving i have considerable improvement of fuel economy. last fill-up i got an average of 13.3L/100km which is around 17.6MPG compared to 14.1MPG without the O2 sensor. . thanks for the help.
YJ-dimi is offline   Reply With Quote Quick reply to this message
Unread 06-27-2013, 11:42 AM   #18
bchap05
Registered User
1994 YJ Wrangler 
 
Join Date: Apr 2011
Location: Boise, ID
Posts: 104
I changed my o2 a week or so ago. I had the tire shop pop it loose for free while rotating my tires so it was easy change took 5 minutes. I was going to reset the computer but never ended up doing it. Jeep runs smoother and better than it ever has since I've had it. Will the computer by now have retrained itself or should I still reset at this point still?
bchap05 is offline   Reply With Quote Quick reply to this message
Unread 06-27-2013, 12:54 PM   #19
idaholtby
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Quote:
Originally Posted by bchap05 View Post
I changed my o2 a week or so ago. I had the tire shop pop it loose for free while rotating my tires so it was easy change took 5 minutes. I was going to reset the computer but never ended up doing it. Jeep runs smoother and better than it ever has since I've had it. Will the computer by now have retrained itself or should I still reset at this point still?
It likely relearned by now and is acting upon the new values. An ECU reset will help with the first three full drive cycles. I bet by now it is no longer worth doing.
idaholtby is offline   Reply With Quote Quick reply to this message
Unread 06-27-2013, 09:54 PM   #20
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,634
You should always reset the computer after changing a sensor. They weren't that smart back then, compared to the newer ones. It only takes a minute to disconnect the battery for a few seconds.
__________________
***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
pete1991YJ is offline   Reply With Quote Quick reply to this message
Unread 06-28-2013, 08:38 AM   #21
YJ-dimi
Registered User
1994 YJ Wrangler 
 
Join Date: May 2007
Location: netherlands
Posts: 21
Quote:
Originally Posted by bchap05 View Post
I changed my o2 a week or so ago. I had the tire shop pop it loose for free while rotating my tires so it was easy change took 5 minutes. I was going to reset the computer but never ended up doing it. Jeep runs smoother and better than it ever has since I've had it. Will the computer by now have retrained itself or should I still reset at this point still?
i don't know if these era jeep ecu re-train themself but it doesn't hurt the ecu for sure. mine spends more time off-juice then on during the year and in the meantime between trips i always disconnect the negative lead with a quick disconnect. very efficient way to preserve your battery over time and it prevents empty battery. i've read at least an 8 hour disconnect would clear the memory.
YJ-dimi is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.