99 CRV, lower gas mileage after timing belt replacement

Discussion in 'CR-V' started by DelCRVOwner, Mar 14, 2006.

  1. DelCRVOwner

    DelCRVOwner Guest

    I am the original owner of a 99 CRV, 2 wheel drive. I have always
    monitored the gas mileage closely - I mentally calculate it just about
    every time I fill the tank - and it's always averaged about 25 mpg.
    The mileage is about 112,000

    About 6 weeks ago, I had the timing belt, water pump, and drive belts
    replaced by a Honda dealership. They also changed the oil, replaced
    the spark plugs, and the left engine mount, which they found was broken
    when doing the timing belt work. Within the same week, I replaced the
    tires (Costco, Michelin X Radial DTs) and had the front end aligned by
    the dealership. I replaced the air cleaner myself.

    Ever since this work was done I'm averaging 22 mpg. Nothing has
    changed about my driving patterns. I've contacted the dealership and
    they've told me that it is not possible that the work they did caused
    the gas mileage reduction. (I consider this to be a reputable shop,
    I've had work done there several times over many years) The advisor
    also implied that this really wasn't anything to be concerned about,
    and there really isn't anything that they can "check" to find the
    cause. As I told him, I disagree, this is >10% reduction in gas
    mileage which is going to cost me about $250 / year.

    So I'm hoping an expert can advise, is it really just a coincidence
    that my gas mileage dropped after this work?
    DelCRVOwner, Mar 14, 2006
  2. DelCRVOwner

    Elle Guest

    Could be just a coincidence.

    Did they put in plugs that Honda recommends?

    How old are the ignition wires?

    Have you checked the inflation pressure of the tires?

    Other tips:
    Elle, Mar 14, 2006
  3. DelCRVOwner

    Alan Guest

    Perhaps the ignition timing changed and needs to be retimed.
    Alan, Mar 14, 2006
  4. DelCRVOwner

    jmattis Guest

    If the cam wasn't aligned right, the valve timing is off. That will
    affect mileage as well as performance. The adviser just wants you to
    go away, it sounds like. It is also possible that your new tires have
    much higher rolling resistance compared to your old ones, but I doubt
    you'd see such a marked change from tires alone.
    jmattis, Mar 14, 2006
  5. DelCRVOwner

    duckbill Guest

    There are way too many variables here. Is your engine idle speed about the
    same? Is it possible the dealer un-aligned your vehicle's tow in? Has the
    weather gotten colder? Different tires, new timing belt, tune up.... Why
    not find out what other compariable Honda's are getting mpg wise. Lastly,
    is it possible someone put the wrong type of oil in your engine?
    duckbill, Mar 14, 2006
  6. DelCRVOwner

    jim beam Guest

    it's possible cam timing was messed up, but i'd expect more than 10%
    drop in gas mileage if it were out a tooth. other things like brakes,
    tires, ignition componentry can /all/ affect mileage too. have all
    those checked, and if after that, you still think it's timing belt, use
    a timing light to check ignition timing yourself. study the steadiness
    of the timing marks under the strobe. [need to do this with the service
    jumper connected.] if the timing is wavering back and forth while
    idling, the belt is loose. it appears to be a fairly common rookie
    mistake that will affect mileage pretty much like you're experiencing.
    take it back and make sure a more experienced person re-tensions it.
    jim beam, Mar 14, 2006
  7. -------------------------------------

    jmattis sounds the closest.

    Does it start and idle EXACTLY the same as before, or does it hesitate a
    bit until it warms up? I would have guessed you have one or the other of
    your cams out of time, or you started buying your gas at a place that
    sells 'winter blend' gasoline.

    You know you should be getting the valves adjusted every 30,000 miles,

    'Curly Q. Links', Mar 14, 2006
  8. DelCRVOwner

    NomoreRGS Guest

    Maybe it wasn't the work done on the engine that is causing the drop
    in fuel economy. Any chance the work done coincided with the warm
    weather/new fuel (alcohol) blend?

    The gas mileage on both of my cars( '91 Accord and '01 Acura CL-S)
    would drop exactly 10% when the MTBE was added around April and
    recovered in October/November when the winter blend was available.
    My guess is that the alcohol blend will be similar. I've noticed a
    slight drop in fuel economy recently but my driving habits have
    changed and would not be a before after good comparison regarding
    NomoreRGS, Jul 4, 2006
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