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99 dodge ram gets 3.6mpg need help!!!!

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  #11  
Old 10-06-2011, 06:05 PM
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after reading everything in this thread, i too am thinkin the o2 sensor is the place to start, was actually what popped in my head after reading the thread subject. do as he said before and unplu the pre-cat o2 sensor and see what happens.

but yes the plenum also kills mpg pretty good. i was gettin like 9-10 mpg city and after full tune up with plenum and o2 sensor changed, im now at 12.5-13mpg city.
 
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Old 10-06-2011, 06:44 PM
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Originally Posted by gdstock
3. Also, as HeyYou asked, list the trouble codes you are getting.
Whoa, HeyYou never asked anything. It was me!

I should ban you for getting us confused!

J/K.
 
  #13  
Old 10-06-2011, 07:21 PM
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Originally Posted by ryan0714
after reading everything in this thread, i too am thinkin the o2 sensor is the place to start, was actually what popped in my head after reading the thread subject. do as he said before and unplu the pre-cat o2 sensor and see what happens.

but yes the plenum also kills mpg pretty good. i was gettin like 9-10 mpg city and after full tune up with plenum and o2 sensor changed, im now at 12.5-13mpg city.
I don't care how bad the o2 has failed, you are not going to get 3.6 mpg.
 
  #14  
Old 10-06-2011, 07:48 PM
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HAHA i was allowing room for mathematical error...
 
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Old 10-06-2011, 09:27 PM
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You could check for a clogged cat also . Which would cause excess gas use trying to get your truck to go . Both plenum and a bad cat will put your gas mileage in single didgets along with poor performance . And if u have the death flash on top of it I couldn't imagine lol
 
  #16  
Old 10-06-2011, 09:32 PM
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Originally Posted by jasonw
Whoa, HeyYou never asked anything. It was me!

I should ban you for getting us confused!

J/K.
Hey man, you know those moderators, they all flippin' look alike anyway......
 
  #17  
Old 10-06-2011, 10:16 PM
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FINALLY!!!! someone i got beat with mpg!!

sorry i can't help ya though. 3.6 sounds crazy regardless of plenum/o2/maf/hole in your tank.
 
  #18  
Old 10-06-2011, 10:45 PM
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i check the milage by setting the odometer to zero every time i fill up also by the sensor thing that says how many miles per gallon you get. to today i had to go get something about 40 mile from my house i was driving for about 20 miles on the freeway and all of a sudden i started to get 28 miles per gallon on the free way then i got 8 mpg on the streets. it was the first time i got that good of mpgs. but i dont no whats going on with this truck. i will check the oil in the morning.
 
  #19  
Old 10-06-2011, 11:03 PM
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Originally Posted by jasonw
Whoa, HeyYou never asked anything. It was me!

I should ban you for getting us confused!

J/K.

Ooops.....Sorry. Oldtimers thing. I stand corrected (leaning on my cane of course).
 
  #20  
Old 10-06-2011, 11:06 PM
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man i feel like calling a taxi, it might be cheaper to have him drive me around then continue to drive this truck. I only got 61000 miles on it..... this sucks!!! im going to try and take the o2 sensor off in the morning also what should i use to take it off, cause i know it will be hard after being heated up and being on their for the past 13 years. any suggestions???
 


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