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Mpg issues

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    #1

    Mpg issues

    Ok folks hers the skinny. My ride seams to well in short words, lacking the proper fuel mileage it once had. Past mpg, 400 miles a tank, presently getting 270, 280. I currently run 91 octane (medium grade) gas in her. Last week when the weather was warm out I noticed that my mpg was at 125 miles on the top quarter tank and was very happy. I do know I have to replace the spark plug seals as the plugs have oil on them. Is there anything else that's going wako?
    To jdm or not jdm that is the question
    Tags: None
    #2
    Fix the problems that you're aware of, and go from there. Also, you don't need to run anything more than 87 octane. That's what the engine was designed for. Higher octane is not "better".

    Is your check engine light on, by any chance?






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      #3
      No, no cel is on thank goodness for that.
      To jdm or not jdm that is the question

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        #4
        Fuel mileage issues

        I agree with the previous comment but would also like to add to it . While your doing the seals here are a few easy checks that can save you a considerable amount of fuel (1) check the air filter (2) check the condition of the spark plugs and gap them to the correct measurement (3) check ignition timing (4) make sure your tires are set to the correct psi.

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          #5
          Fuel mileage issue

          I forgot to include / even though there isn't any codes , that does not completely rule out the oxygen sensor . I have seen o2 sensors become lazy enough to affect gas Mileage but not throw a code... I also recommend cleaning the throttle body while your doing the above suggestions . Cheers!

          Comment

            #6
            Mileage will suffer some in the cold weather. Please keep a log of fuel used and actual miles driven, it will provide a more accurate measure of your fuel mileage than "so many miles per tank". That assumes that you're filling up at the exact same spot on the gauge; there are differences in pump shut off, etc. that can affect how much actually goes in the tank.

            When you do the spark plug tube seals, you have to do the lowers as well as the uppers. Back off all the valve adjusters before removing the rocker assembly. When reinstalling, torque the rocker assembly mouting bolts to spec (in steps), then adjust the valves.

            Along with checking the plugs themselves, check the condition of the distributor rotor and cap terminals.

            Replaced the fuel filter lately?

            You might also check to see if the brakes are dragging.
            90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
            08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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