Installed Offroad pipe last week, my gas mileage is horrible now

Discussion in 'SN95 4.6L Mustang Tech' started by derek02gt, Jun 13, 2004.

  1. derek02gt New Member

    Member Since:
    Dec 25, 2003
    Message Count:
    256
    Likes Received:
    0
    Trophy Points:
    0
    i dont know why but my gas has gone to crap..and i blame it on the offroad pipe but im not 100% sure so please correct me, i used to get like 255-275miles on a full tank..thats combined city/highway..now im only getting 200-210..a HUGE DROP in gas mileage..can anybody tell me why?i have installed my mil eliminators and there is a SES light still on..but this is frustrating..30 dollars of gas gives me 200 miles..please let me know whats going on...btw if i unplug the front 02 sensors..would that help?thanks
    derek02gt, Jun 13, 2004
    #1

  2. wht99gtconv New Member

    Member Since:
    Dec 1, 2003
    Message Count:
    268
    Likes Received:
    0
    Trophy Points:
    0
    Did you disconnect the battery for about 5 minutes, if not do that and that should take care of the SES light. For the gas problem only thing I can think of is you might need to change your 02 sensors.
    wht99gtconv, Jun 13, 2004
    #2


    Sponsored Ad

  3. triggz Founding Member

    Member Since:
    May 15, 2002
    Message Count:
    1,291
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Gadsden, AL
    If the SES light is still on, your MIL elims are faulty. The light should go off by itself soon after being patched.
    I suggesting returning them and patch the O2 sensors yourself, its cheap and easy once the sensors are off. No cats will NOT hurt your gas mileage. It improved mine a bit. I just got 23.6mpg on a late nite 150mile trip home.

    Heres a wiring diagram..you can get the parts at Radio Shack for under $5.
    [IMG]
    triggz, Jun 13, 2004
    #3

  4. wht99gtconv New Member

    Member Since:
    Dec 1, 2003
    Message Count:
    268
    Likes Received:
    0
    Trophy Points:
    0
    Sorry to disagree, but anytime the SES light comes on it has to be reset.
    wht99gtconv, Jun 13, 2004
    #4

  5. triggz Founding Member

    Member Since:
    May 15, 2002
    Message Count:
    1,291
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Gadsden, AL
    We'll have to agree to disagree then. My trouble codes and SES light went away by itself after being patched within 10 miles just as suddenly as it originally came on.
    triggz, Jun 13, 2004
    #5

  6. wht99gtconv New Member

    Member Since:
    Dec 1, 2003
    Message Count:
    268
    Likes Received:
    0
    Trophy Points:
    0
    How long was that ago
    wht99gtconv, Jun 13, 2004
    #6

  7. NV01GT New Member

    Member Since:
    Nov 21, 2001
    Message Count:
    44
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Pearland, TX
    It might be the LEAD FOOT syndrome. :D
    NV01GT, Jun 13, 2004
    #7

  8. triggz Founding Member

    Member Since:
    May 15, 2002
    Message Count:
    1,291
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Gadsden, AL
    My patchwork? About 3 months ago...
    triggz, Jun 13, 2004
    #8

  9. derek02gt New Member

    Member Since:
    Dec 25, 2003
    Message Count:
    256
    Likes Received:
    0
    Trophy Points:
    0
    sorry guys but I am truly a idiot, i meant "havent" instead of "have..I haven't installed my mil eliminators just yet..could that be a reason?is it possible to have bad o2's on a 2002 car?
    derek02gt, Jun 13, 2004
    #9

  10. COramprat Old guys rule!!!

    Member Since:
    Mar 3, 2003
    Message Count:
    5,344
    Likes Received:
    11
    Trophy Points:
    88
    Location:
    Sea of Tranquility
    That is your problem...that is what the MIL's do...fools the computer into thinking you have cats.
    COramprat, Jun 13, 2004
    #10

  11. 46gtsblown Founding Member

    Member Since:
    Jan 9, 2002
    Message Count:
    283
    Likes Received:
    0
    Trophy Points:
    0
    True it fools the computer.
    However, IF the MIL is triggered by not having cats or faulty REAR O2 sensors it will make ZERO difference to the running of the car.
    The rear O2's are there purely to monitor the cat function.
    The EEC will not pull timing or go into limp mode just for that.
    Do not disconect the front O2 sensors this will screw things up big time.
    Make sure that you have installed the O2 sensors correctly and they are hooked up.
    Make sure you have no leaks
    Reset the computer.
    Clean your MAF ( I do this as a first step for any engine trouble shooting)
    If is has been a while run some injector cleaner through it.

    Dwayne
    46gtsblown, Jun 13, 2004
    #11

  12. 03poontanggt New Member

    Member Since:
    Feb 23, 2004
    Message Count:
    296
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    fresno ca
    How do you like the smell. I have the same problem with gas. I ran the hell out of it before the X and I run the hell out of it now. 255-275 before 190-210 now
    03poontanggt, Jun 13, 2004
    #12

Share This Page