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Bad Gas Mileage...

Discussion in 'Tech Archive (No Posting)' started by postal21, Aug 12, 2008.



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  1. postal21

    postal21 vroom vroom Registered VIP 5+ Year Member 10+ Year Member

    Joined:
    Nov 19, 2003
    Messages:
    788
    Location:
    DYT ohio.
    Okay, so my car has been getting bad gas mileage for awhile... I used to get around 30mpg, nowadays Im lucky to get in the low 20s...

    Ive had a tune-up and timing belt changed recently and the problem still persists.

    How much can my car being out of alignment and my front left strut being slightly broken ( missing a washer or something causing it to cause wheel hop etc.) effect my cars mileage?

    My only other idea is that the o2 sensor has gone bad and is causing a bad fuel mix or something. Because I do have a catback exhaust... *shrug*

    Help me. =)

    btw, car has around 116,000 miles, everything but it being lowered and exhaust is stock.
     
  2. Jersey8

    Jersey8 B20: Detroit Muscle! Registered VIP Registered OG 5+ Year Member

    Joined:
    Mar 4, 2006
    Messages:
    4,671
    Location:
    MI
    your o2 sensor can drastically effect your gas mileage. your alignment can cause it to drop slightly, depending how bad it is. change your o2 sensor, and your gas mileage will get better

    is it your primary o2 or secondary o2?
     
  3. Billy.

    Billy. Has returned ;-) Registered VIP Registered OG 5+ Year Member 10+ Year Member

    Joined:
    Oct 12, 2003
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    11,248
    Location:
    Chucktown, SC
    o2 sensor x2
     
  4. 96swpdEK

    96swpdEK New Member Registered VIP 5+ Year Member

    Joined:
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    o2 sensor = $$$

    sucks.
     
  5. Inertial

    Inertial New Member Registered VIP 5+ Year Member

    Joined:
    Feb 18, 2008
    Messages:
    330
    Location:
    Buffalo, NY
    my secondary/downstream o2 sensor has been changed 3 times this year =[

    it fixed the issue you are having for maybe 2weeks-1month before the o2 sensor went again. Idk im probably gonna go to honda to get their o2 sensor in my 150k checkup
     
  6. ScratchNSniff

    ScratchNSniff New Member Registered VIP 5+ Year Member

    Joined:
    Sep 15, 2007
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    3,241
    Location:
    Greenville, SC
    Get fuel injectors cleaned...not sure if that was part of your tune up or not...I was experiencing horrible mileage (around 18-19MPG) and tried everything until one day I thought maybe it was dirty injectors...well it was...now I am back to getting around 34 MPG...yes, a 16MPG difference...
     
  7. MidniteMike

    MidniteMike New Member 5+ Year Member

    Joined:
    Aug 17, 2008
    Messages:
    15
    Location:
    Arkansas
    I just went through this same thing with my car it seems, changed the primary O2 sensor and spotted a crack in the exhaust manifold, and since i'm cheap I just patched the crack for now, did this about a week ago and now am getting my 35mpg again compared to the 21 i was getting...
     
  8. RedValve

    RedValve ~Team Penguin 5+ Year Member

    Joined:
    Mar 30, 2008
    Messages:
    208
    Location:
    Houston, TX
    mostly likely its the o2 sensor, but if you want to make sure check the fuel filter too id thats old might as well replace that also.
     


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