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Thread: hard on gas

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    hard on gas

    I just bought a 2001 tj 4.0 its a 3 speed auto any tips on getting better fuel mileage seems i cant keep gas in it

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    The 2001's have a fuel issue. They were fitted with a 7th fuel injector. Basically when you RPMS go over 800rpm, the 7th injector is turned on and sprays fuel on the front diff. Its used for cooling...

    Its a jeep, unfortunately you have to pay to play...

    Post some pictures and enjoy a doorless summer!

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    haaaa haaa - I think I peed!

    The manual tranys are better, but still not great.......
    OF4WD Member 4884 - no longer in search of more speed!

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    Lol. Your driving a shoebox. Go light on the gas, maybe change the plugs/fuel filter, perform a fuel service. I dunno. I get about 200km a tank of gas but I have drive a heavy GC with a v8.
    I don't always tread, but when I do, I, tread lightly

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    Unfortunately not too much to do to make it better on gas and it being an auto Trans too will make it worse. Things you could do is simple maintenance ( oil, diffs, Trans fluids) check air filter, basically a tune up. run some sea foam threw the gas.

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    Quote Originally Posted by Tessellate View Post
    The 2001's have a fuel issue. They were fitted with a 7th fuel injector. Basically when you RPMS go over 800rpm, the 7th injector is turned on and sprays fuel on the front diff. Its used for cooling...

    Its a jeep, unfortunately you have to pay to play...

    Post some pictures and enjoy a doorless summer!
    best explanation I've heard so far lol
    03 Rubicon with stuff to make it gooder

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    Retread #19

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    Quote Originally Posted by outrage9999 View Post
    I just bought a 2001 tj 4.0 its a 3 speed auto any tips on getting better fuel mileage seems i cant keep gas in it
    I bought the wife a 3spd auto Tj and it sucks the gas, as the RPM's seem to run pretty high over 60kms/hr, nothing you can do with NO overdrive... and yes you are driving a shoe box/brick. if you get 350-400kms/tank that's not too bad.
    OF4WD MEMBER# 6656

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    Gas mileage on a jeep page..that's pretty funny..but my 03 TJ 5 spd would prob average around 5-600 Kms ..once lift tires ect went on that fell to around 400

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    I have a 03 TJ with an automatic and agree ... it's not good. I try to console myself by thinking the guys driving around in pickup trucks are paying at least the same but not having as much fun. Am I right?

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    Junk the 3-speed... worst piece of crap on the planet.

    Fuel economy in a Jeep is never going to be "good" as it's basically a flying brick, but there's a lot that should be done to any 13-year old vehicle. At that age a tune-up is going to be almost everything. Most sensors play a part in fuel economy, make sure they're accurate. If the O2 sensors are original - change 'em. They only last 160k or so. All four are used in 2001+ 4.0L PCMs for calculating fuel usage. New spark plugs, air filter, correct tire pressure, clean throttle body, clean and test IAT sensor, test ECT sensor, synthetic diff oil (80w90 is STIFF when cold)... the list goes on.
    But our trip was different. It was to be a classic affirmation of everything right and true in the national character. A gross physical salute to the fantastic possibilities of life in this country. But only for those with true grit.

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    leave it parked in the driveway if the fuel cost is to high...... who am I kidding, filler her up and drive it. you musta know you don't own a jeep for its saving on fuel. Best thing I can say good tune up easy on the fuel pedal......
    a learning experience is one of those things that says, you know that thing you just did...don't do that again.

  12. #12
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    Quote Originally Posted by PCO6 View Post
    I have a 03 TJ with an automatic and agree ... it's not good. I try to console myself by thinking the guys driving around in pickup trucks are paying at least the same but not having as much fun. Am I right?
    No your totally wrong..those guys are getting way better gas milieage

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    There are Many ways to improve fuel for your Jeep but most people would rather say "on no you just have to live with it" then do something about it which is not correct info...

    However it will cost you money to save money...
    things to look at
    - do your tires match your gears and correct tire pressure
    - how hard on the gas pedal are you
    - do you actually know your fuel economy (most complain about it but have never actually run the actual numbers)
    - how is your engine maintenance (as mentioned earlier, plug wires etc)
    - check the engine oil, diffs, transmission, t-case fluids and if possible swap with a synthetic (I run Royal Purple in all mine)
    - distance traveled regularly (even the best economy won’t help you if you do not drive far enough each day)

    My CJ on 35" tires and 3 Speed auto (same one you have) got over 400KM per tank in the city and over 600KM per tank on the HWY with the same size tank as you have...

    Things that will aid in better fuel economy but if you don't change you nothing will help as you will just burn up any savings
    - gears that properly match your Tire size
    - switch to electric fan over mechanical (not recommended if you are into MUD)
    - power upgrades (many to choose from)
    - better air intake system and better flowing exhaust system
    - change your driving style and keep the RPM's below 2000 as much as possible
    - hub conversion for the front axle
    - engine swap

    and much more but as I said it will cost money to save money which is why most people don't even try...
    Last edited by Jeepman; 01-23-2014 at 11:55 AM. Reason: typo
    1989 Jeep MJ: 4.7L Stroker, 4WD Swap, 97+Conversion, RC Long Arm Upgrade Kit, 35x12.5x18 Mickey Thompson MTZ's, WJ D30, WK SRT8 Rear D44 w/approx. 8" Lift
    1983 Jeep CJ7: SOLD

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    Quote Originally Posted by davey25 View Post
    No your totally wrong..those guys are getting way better gas milieage
    According to http://www.fueleconomy.gov/ my 03' TJ should get similar mileage to a F150 of the same age but YMMV.

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    check what a new Ram truck gets with the 6 cyl. & 8spd auto trans
    it'll make you wonder why they can't offer a Jeep with decent mileage

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    Yup, my 02 Yukon XLT on 35's gets better milage then m 05 TJ I had on 35's.
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    you are correct sir, cant keep gas in them. put it back to stock and run 29" tires to get it back to a somewhat terrible fuel economy.
    it's a brick, and aerodynamics is its downfall.
    I do suppose you could drive it with the top off and windshield down to reduce drag. probably the best option, as well, run oem tires and lift.
    just have to invest in a full face helmet and a good snowsuit !

  18. #18
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    Quote Originally Posted by v1nc3 View Post
    I do suppose you could drive it with the top off and windshield down to reduce drag. probably the best option, as well, run oem tires and lift.
    just have to invest in a full face helmet and a good snowsuit !


    This is what hypermiling in a Jeep looks like

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    Wanna sell it...I'm in the market for one

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    hard on gas

    Greatest modification I ever did to my Jeep has 2 words............. Honda Civic. And yes the math included capital cost, insurance and all other vehicle related expenses. Long commutes and Jeeps go together like Civics and fun do.
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