Need HELP!!! - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-05-2013, 09:26 PM   #1
Jeeper
 
tsteb's Avatar
 
Join Date: Apr 2012
Location: Eastern North Carolina
Posts: 1,006
Need HELP!!!

Mpg recently has gone out the window. Same driving habits. Wondering what problem might be. Any suggestions?

__________________
1998 Wrangler Gunmetal Blue
Build thread: http://www.wranglerforum.com/f322/my...ck-232687.html
tsteb is offline   Quote
Old 02-05-2013, 09:44 PM   #2
Jeeper
 
Joshpeb2's Avatar
 
Join Date: Sep 2010
Posts: 313
Could be bad upstream o2(s). Common side effect when they crap out and they wont always trigger a check engine light.

Joshpeb2 is offline   Quote
Old 02-05-2013, 09:47 PM   #3
K O R

WF Supporting Member
 
dabolt55's Avatar
 
Join Date: Jul 2011
Location: Clinton, Tn.
Posts: 13,228
Images: 52
__________________
Nothing to it but to do it.
SIMPLE AS THAT.

'04 TJ RUBICON, 4.0l auto
2"BDS coils, Rubicon express shocks, 33/12.50/15 Dick Cepek Mud Country tires yellowed out, on Black steel D's.
dabolt55 is offline   Quote
Old 02-05-2013, 10:10 PM   #4
Jeeper
 
tsteb's Avatar
 
Join Date: Apr 2012
Location: Eastern North Carolina
Posts: 1,006
Quote:
Originally Posted by Joshpeb2
Could be bad upstream o2(s). Common side effect when they crap out and they wont always trigger a check engine light.
The o2 sensors? How much would you estimate for them to be fixed? What about fuel filter
__________________
1998 Wrangler Gunmetal Blue
Build thread: http://www.wranglerforum.com/f322/my...ck-232687.html
tsteb is offline   Quote
Old 02-05-2013, 10:15 PM   #5
Jeeper
 
KingTJ's Avatar
 
Join Date: Nov 2012
Location: Bowling Green, KY
Posts: 148
Quote:
Originally Posted by tsteb

The o2 sensors? How much would you estimate for them to be fixed? What about fuel filter
Having the same problem. Just ordered my two upstream on rockauto.com for a little over $60 shipped. By far the best prices I've found anywhere. Thanks to this forum I've found out great things about rock auto and decided to go that route!
__________________
MPG's? What are these things you speak of?
KingTJ is offline   Quote
Old 02-05-2013, 10:33 PM   #6
Jeeper
 
tsteb's Avatar
 
Join Date: Apr 2012
Location: Eastern North Carolina
Posts: 1,006
What do I need upstream or downstream? What is their purpose
__________________
1998 Wrangler Gunmetal Blue
Build thread: http://www.wranglerforum.com/f322/my...ck-232687.html
tsteb is offline   Quote
Old 02-05-2013, 11:07 PM   #7
Jeeper
 
KingTJ's Avatar
 
Join Date: Nov 2012
Location: Bowling Green, KY
Posts: 148
Quote:
Originally Posted by tsteb
What do I need upstream or downstream? What is their purpose
The upstream sensors are what tend to control fuel delivery. When you computer is saying your running lean ( your upstream o2 sensors have gotten lazy ) and the computer compensates for your jeep running lean by pushing more fuel. The downstream sensors are there to tell your computer than you have a problem in your catalytic converter(s). They have nothing to do with fuel delivery. As mentioned above, MPG will always slightly fall in the winter due to the winter fuel mix but o2 sensors still need to be changed periodically so isn't a better time to do so!
__________________
MPG's? What are these things you speak of?
KingTJ is offline   Quote
Old 02-05-2013, 11:12 PM   #8
Jeeper
 
tsteb's Avatar
 
Join Date: Apr 2012
Location: Eastern North Carolina
Posts: 1,006
Quote:
Originally Posted by KingTJ

The upstream sensors are what tend to control fuel delivery. When you computer is saying your running lean ( your upstream o2 sensors have gotten lazy ) and the computer compensates for your jeep running lean by pushing more fuel. The downstream sensors are there to tell your computer than you have a problem in your catalytic converter(s). They have nothing to do with fuel delivery. As mentioned above, MPG will always slightly fall in the winter due to the winter fuel mix but o2 sensors still need to be changed periodically so isn't a better time to do so!
Alright thanks! Got it a year ago so still learning here haha guess I should do it anyway.
__________________
1998 Wrangler Gunmetal Blue
Build thread: http://www.wranglerforum.com/f322/my...ck-232687.html
tsteb is offline   Quote
Old 02-05-2013, 11:14 PM   #9
Jeeper
 
KingTJ's Avatar
 
Join Date: Nov 2012
Location: Bowling Green, KY
Posts: 148
I've not had mine very long and am still figuring things out. Have learned so much on this forum and I'm grateful for all the help I've received! Let us know if it helps!
__________________
MPG's? What are these things you speak of?
KingTJ is offline   Quote
Old 02-05-2013, 11:32 PM   #10
Jeeper
 
Join Date: Dec 2012
Posts: 2,631
Some winter gas facts:

9 reasons why your winter fuel economy bites! - MetroMPG.com

Clarified some questions on the subject
RevCo666 is offline   Quote
Old 02-06-2013, 05:58 AM   #11
Jeeper
 
tsteb's Avatar
 
Join Date: Apr 2012
Location: Eastern North Carolina
Posts: 1,006
Quote:
Originally Posted by RevCo666
Some winter gas facts:

9 reasons why your winter fuel economy bites! - MetroMPG.com

Clarified some questions on the subject
Very helpful tips! Thanks
__________________
1998 Wrangler Gunmetal Blue
Build thread: http://www.wranglerforum.com/f322/my...ck-232687.html
tsteb is offline   Quote
Old 02-06-2013, 07:47 AM   #12
Jeeper
 
Join Date: Dec 2012
Posts: 2,631
Quote:
Originally Posted by tsteb View Post
Very helpful tips! Thanks
No problem! Hell I didn't even know about winter gas blends till now would be nice of those damn petro companies to advise the general public or atleast the local area you reside in of what your pumping instead of learning the hard way. Should be law.

RevCo666 is offline   Quote
Reply

Thread Tools

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




Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:04 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC