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  1. #1
    Junior Member
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    Ugh filled up 3 times in 8 days. help

    Man gas is killing me now. I have had to completly fill up my 98 ta 3 times in the past 8 days. im getting about 215 or so miles per tank. around 16.5 mpg. I do get on it alot. I have a check engine light on right now. i think it read something about a o2 sensor before the cattilac converter. do yal think it might be running rich and thats why my mpg is bad? think something is wrong or just bad driving habits?

  2. #2
    Mustangs in the mirrors 02Hawk's Avatar
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    Apr 2007
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    Black
    2002 Firehawk Trans Am

    helll ya and always make sure your tire pressure is correct and air filter is clean. Get the O2 sensor fixed messes with your fuel curve.

  3. #3
    Senior Member SeVeReDiStOrTiOn's Avatar
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    Aug 2005
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    Roseville, CA
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    8,164

    05 Wrangler
    00 Z28 sold :-(

    Quote Originally Posted by wonderboy View Post
    Man gas is killing me now. I have had to completly fill up my 98 ta 3 times in the past 8 days. im getting about 215 or so miles per tank. around 16.5 mpg. I do get on it alot. I have a check engine light on right now. i think it read something about a o2 sensor before the cattilac converter. do yal think it might be running rich and thats why my mpg is bad? think something is wrong or just bad driving habits?
    Main problem is in bold...only a problem when trying to get good mpg.

    The code is probably a post-cat code...rent/buy a scanner and post up the code. LS1's run pretty rich from the factory so getting a tune will also help...my predator handheld helped a lot.

  4. #4
    Trans Am for life baby SexyTransAm's Avatar
    Join Date
    Feb 2007
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    E-town, Kentucky
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    37
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    343

    95-black & 80-blue
    95 Trans Am and 80 TA

    get a new o2 and then seafome the car

  5. #5
    Junior Member
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    Apr 2007
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    EASTERN, NC
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    4

    WHITE
    99 WS-6

    Coreect me if I am wrong but wont the PCM run in OPEN LOOP and on a specific set of parameteers if the o2 sensor is broke?

  6. #6
    Senior Member
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    Jul 2005
    Location
    Jacksonville, FL
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    2,723
    A bad 02 sensor before the cat can definitely affect fuel mileage. Stop by some place like auto zone, they'll read and code(s) free.

  7. #7
    Junior Member
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    Apr 2007
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    Phoenix
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    9

    black
    1998 z28 ls1

    I haven't had o2 on my car in about 5 years. No cats... my CEL has been on that long, My gas mileage was crappy before going no cats, also never had a tune

  8. #8
    Member
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    Apr 2007
    Location
    San Diego
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    177

    Red
    2002 T/A

    Quote Originally Posted by LS177 View Post
    I haven't had o2 on my car in about 5 years. No cats... my CEL has been on that long, My gas mileage was crappy before going no cats, also never had a tune
    4 anybody not just LS177. Front o2's are very important IMO for street car that isn't always at WOT. A good tune will give you max performance out of your setup, but front o2's are there as a final check for the pcm and to compensate for wear and tear on engine components both electrical and mechanical. Yes, an OBDII car such as this will stay in open loop without feedback from those o2's (it's the Cali Smog Tech in me talkin'). Not good for MPG. Just my .02

  9. #9
    Senior Member Danger731's Avatar
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    Indy
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    6,735
    yeah fix that code, what year is the car ?

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