S70 100k maintenance?

Discussion in 'Volvo S70' started by whcguard-deja, Jun 15, 2005.

  1. My '98 S70 is about 106k miles now. A mechanic friend told me all it
    needed for 100k maintenance were things like oil/filter change, fuel
    filter change, transmission fluid change, and new spark plugs (all

    However, I'm wondering if I missed anything like engine timing
    adjustment or any type of adjustments?

    I ask because over the last 8 months my gas mileage has been dropping
    from 23MPG to 19MPG (87 gas always used) without change of driving
    conditions or habits. Such drop also conincided with the time when then
    odo reached 100k.

    Adding of fuel injector cleaner didn't help.

    What should I do to bring the gas mileage back?

    whcguard-deja, Jun 15, 2005
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  2. whcguard-deja

    Mike F Guest

    First make sure the wheels rotate freely after driving the car to make
    sure the brakes aren't hanging up. When spinning the fronts, don't
    mistake resistance from the differential for dragging brakes.

    They're not regular maintenance, and usually (but not always) set a
    fault code when they're starting to go bad, but the front oxygen sensor
    can cause this.

    Also I didn't notice any mention of the air filter. And there's nothing
    to adjust.

    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
    Mike F, Jun 15, 2005
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  3. whcguard-deja

    mdrawson Guest

    My owner's manual (for 2000 S70 indicates that timing belt should be changed
    at 105K miles. Don't know if that'd have anything to do with mileage or
    not. I'm coming up on that shortly, but my gas mileage hasn't changed.
    mdrawson, Jun 15, 2005
  4. Thanks Mike and mdrawson! I'm sure air filter and timing belt are not
    the concern. Air filter has been changed at 30k interval and the
    current one has been used for less than 10k miles. Timing belt was
    changed at 90k miles.

    I don't think the brakes are malfunctioning to cause reduction of MPG.
    But I'll try to double check.

    Actually O2 sensor is the one I'm suspecting. But there's no sign (like
    Check Engine light) for its going bad. Wonder if it's worthwhile just
    replacing it for a change.

    I am also wondering about other things like a new set of spark plug
    wires (stock ones still used) or something else.

    There got to be a reason. Not only the MPG has dropped significantly
    (more than 20%), I can also clearly feel that the horse power of my S70
    is much worse than before.

    I'll appreciate any thoughts or input.

    whcguard-deja, Jun 16, 2005
  5. I have a '99 S70.

    It gets about 29-31 on hiway, and about 24 in town.

    Into the living sea of waking dreams, Jun 17, 2005
  6. It's a bit hilly in my area. For instance there's about 900ft altitude
    change between work and home, though it's only 8 miles. So slightly
    lower gas mileage is expected. But my concern stems from difference
    between now and one year ago with the same style of driving.

    Yesterday "Check Engine" light came up. Maybe something is indeed
    wrong. I'll try to find out what code it is by using my ODBII reader.

    whcguard-deja, Jun 18, 2005
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