O2 sensor should or should not be connected to ?? - Page 2 - JeepForum.com
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Unread 03-27-2013, 08:38 AM   #16
YJ-dimi
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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.

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Unread 06-27-2013, 05:10 AM   #17
YJ-dimi
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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.
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Unread 06-27-2013, 10:42 AM   #18
bchap05
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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?
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Unread 06-27-2013, 11:54 AM   #19
idaholtby
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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.
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Unread 06-27-2013, 08:54 PM   #20
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,629
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.
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Unread 06-28-2013, 07:38 AM   #21
YJ-dimi
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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.
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