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Thread: Bad MPG. What else am I missing?

  1. #26
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    Quote Originally Posted by Buzo View Post
    Good to hear that it improved from 15 to 22!

    How is your choke working in general?

    The choke is usually needed for the cold mornings only, but during the day we don't need that much fuel to restart the car.

    An easy way to check if you have choke problems is if your car restarts very rough and you need to accelerate it to control it.

    A restart means being driven for some time, then stop the car and attempt to restart it into the next 5-30 minutes.
    I actually had my choke deleted so its not gonna be a problem.

    I'll recheck the booster check valve again and I'll try to find a hand vacuum pump too.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)



  2. #27
    3Geez Veteran Civic Accord Honda's Avatar
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    Re: Bad MPG. What else am I missing?

    Good tip for not needing a vac pump. long hose. put in mouth. suck .tip i learned a long time ago for testin EGRs and stuffs

    1988 Honda Accord LX-i Coupe 123k miles.

  3. #28
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    Quote Originally Posted by Civic Accord Honda View Post
    Good tip for not needing a vac pump. long hose. put in mouth. suck .tip i learned a long time ago for testin EGRs and stuffs
    I might give that a try Good tip!

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  4. #29
    LX User 2geeSEi's Avatar
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    Re: Bad MPG. What else am I missing?

    It's kind of tough to watch your timing mark while doing that though and tell how long the vacuum is holding. My hand vacuum pump is one of the most useful tools I have ever bought. You can get them for $25-$30. Great for testing all kinds of things, and you can bleed brakes without a helper. I have even used it to start siphoning gas without worrying about getting it in my mouth.

  5. #30
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    Haven't got around testing the vacuum advance but I've got myself an EK booster+master cylinder for cheap so I figured I'll just replace them Updates soon.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  6. #31

    2ndGenGuy's Avatar
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    Re: Bad MPG. What else am I missing?

    You could try disconnecting the booster and just running with manual brakes and see if that helps. I had to do that on mine, couldn't stand the hiss and the inconsistent brake pedal.

  7. #32

    Re: Bad MPG. What else am I missing?

    a hissing brake booster is blown and causes a vacuum leak
    the check valve is there so you still have power assist after full throttle, it will not stop the leak
    another thing to consider:
    if your overall wheel size is bigger and you are calculating mpg by your odometer you will have lower mpg because you have actually traveled farther than your odometer indicates fyi
    Eric
    3geez member since October 12, 2000
    "All this worldly wisdom was once the unamiable heresy of some wise man." - Henry David Thoreau

  8. #33
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    Replaced my booster few weeks back and the hissing is gone as well as gaining around 2-3 MPG.

    Man I never considered the wheel size now. Does anybody know what the exact size of the stock 1g tires? I know its 155-13" but nobody listed the profile (N)

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  9. #34

    Dr_Snooz's Avatar
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    Re: Bad MPG. What else am I missing?

    On the '76, the tire size was 155 SR 13, which means the sidewall is 100, I guess. The tire size changed by '81 though, and I don't know what it was.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

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  10. #35
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    I guess I'll check the speedo with my GPS to confirm if its accurate or not.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  11. #36

    Re: Bad MPG. What else am I missing?

    you need to check the odometer too, the speedo is probably off a bit if you pulled the needles to paint them orange.
    The odometer is usually pretty accurate if the tire size is right
    Eric
    3geez member since October 12, 2000
    "All this worldly wisdom was once the unamiable heresy of some wise man." - Henry David Thoreau

  12. #37
    2.0Si User Hazwan's Avatar
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    Re: Bad MPG. What else am I missing?

    Quote Originally Posted by POS carb View Post
    you need to check the odometer too, the speedo is probably off a bit if you pulled the needles to paint them orange.
    The odometer is usually pretty accurate if the tire size is right
    OMG yes you are right! I just got around checking the exact odometer reading compared to my GPS and its about 0.14km off per km. Which the odometer would read 14km less if I travel 100km according to the odo. It would be 114km exactly according to GPS.

    Looks like I'm gonna have to recalculate my MPG again with my GPS (Y)

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  13. #38

    Re: Bad MPG. What else am I missing?

    Glad I could help.
    so now, when you check your mpg by your odometer, just multiply your kms traveled by 1.14 and divide by gallons and it should be right
    Eric
    3geez member since October 12, 2000
    "All this worldly wisdom was once the unamiable heresy of some wise man." - Henry David Thoreau

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