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Old 02-05-2013, 08:26 PM   #1
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Need HELP!!!

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

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Old 02-05-2013, 08:44 PM   #2
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Could be bad upstream o2(s). Common side effect when they crap out and they wont always trigger a check engine light.

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Old 02-05-2013, 08:47 PM   #3
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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.
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Old 02-05-2013, 09:10 PM   #4
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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
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Old 02-05-2013, 09:15 PM   #5
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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!
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Old 02-05-2013, 09:33 PM   #6
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What do I need upstream or downstream? What is their purpose
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Old 02-05-2013, 10:07 PM   #7
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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!
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Old 02-05-2013, 10:12 PM   #8
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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.
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Old 02-05-2013, 10:14 PM   #9
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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!
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Old 02-05-2013, 10:32 PM   #10
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Some winter gas facts:

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

Clarified some questions on the subject
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Old 02-06-2013, 04:58 AM   #11
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Some winter gas facts:

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

Clarified some questions on the subject
Very helpful tips! Thanks
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Old 02-06-2013, 06:47 AM   #12
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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.

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