Question Poor fuel mileage on 2000 3.4

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  • 1 Post By tundra3400

Thread: Poor fuel mileage on 2000 3.4

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    Default Poor fuel mileage on 2000 3.4

    Just seeing if anyone has had a similar problem. I was getting a lean code....replaced the mass air flow sensor. Code is gone but now my fuel mileage is significantly less which is the opposite of what I anticipated. Does anyone have any suggestions?

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    Default Re: Poor fuel mileage on 2000 3.4

    significantly less? as compared to what? what are you getting now?
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    Default Re: Poor fuel mileage on 2000 3.4

    Give us some reference points to work with. What was your mileage previous and what is it now? How long have you tracked your mileage? Also, colder temperatures equate to longer warm-up times and combined with winter-blend fuel will ding your mileage.
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    Default Re: Poor fuel mileage on 2000 3.4

    What are you running for tires? What was the actual code that was read? What is the current mileage on the truck, and what maintenance and mods have been done?

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    Default Re: Poor fuel mileage on 2000 3.4

    Did you clear your ecu's memory during/after swapping MAFs (either with code-reader or by disconnecting battery for 10 minutes or so)?

    FWIW, with my 3.4L I get anywhere from 16.5mpg @ 75mph to 22mpg @ 55mph on the highway and ~14mpg city. I also get roughly 0.5 mpg better fuel economy with 88-89 octane vs 87 (counter-intuitive because 87 octane actually has more energy content per volume). The truck idles noticeably smoother on mid-grade fuel too.
    Last edited by Pushrod; 01-03-2013 at 11:18 PM.

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    Default Re: Poor fuel mileage on 2000 3.4

    Been off for a while thanks for replies...I used to consistantly get 18 to 20 mpg. The code was a bank 1 system lean. Code was cleared before new maf. Theres 200,000 on it and I'm running cooper discoverers atp. Now I'm getting around 14 or 15 consistantly.....same driving conditions. No codes truck runs great.

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    Default Re: Poor fuel mileage on 2000 3.4

    Quote Originally Posted by chatfield View Post
    Been off for a while thanks for replies...I used to consistantly get 18 to 20 mpg. The code was a bank 1 system lean. Code was cleared before new maf. Theres 200,000 on it and I'm running cooper discoverers atp. Now I'm getting around 14 or 15 consistantly.....same driving conditions. No codes truck runs great.
    my 2000 3.4 gets close to the same mileage your talking about. ill get 20-22 on the highway in the summer and i get 14-16 around town in the winter and its a little better in the summer. just lay off the pedal and get her into overdrive as soon as possible and keep her there and she wont chug gas.
    buglao likes this.
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