XC 70 / 2.5t Intake valve issues

Discussion in 'Volvo XC70' started by encat, Dec 28, 2005.

  1. encat

    encat Guest

    Just picked our Cross Country up from the shop where they replaced a pile o
    valves. Our concern was the check engine light. Apparently there is a
    bulletin on this - carbon build up, which seems strange as we put good fuel
    in it. It's an 04 with under 25k on the clock. Anyone else?
    encat, Dec 28, 2005
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  2. That would take the cake ,are you sure the fuel is ok as thats a new car not
    even run in and why replace the valves ,it doesn't make sense sorry .I would
    be very suspicious of the fuel .
    John Robertson, Dec 28, 2005
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  3. encat

    Steve Guest

    In 1986 or so BMW had a recall for the same thing. The fix was to remove
    the intake manifold and shoot walnut shells under high pressure into the
    intake side of the head.

    The shells were soft enough that they would not damage the cylinders, or the

    There was also Techron added to the tank and the owner was instructed to run
    the tank almost to empty, then pour the provided additional can of techron
    in before refilling the car next time.

    I think that following sites have some good information to try to avoid
    issues like this:

    Steve, Dec 28, 2005
  4. encat

    encat Guest

    Thanks for the links. Interesting reading. We use 80% + Chevron and the rest
    Shell. They indicated that Shell was evil. I've never had (or heard of) a
    bad Shell issue before. We had switched from Premium to Midgrade at their
    requests due to a starting issue. Valve scoring and carbon deposits. At 23k,
    it doesn't seem to make sense. The service dept said it was definately a
    fuel issue, not a problem with the car. (Tho they warranteed the repair
    $2400 @ warranty cost) Obviously, I wouldn't want to pay this (or worse) out
    of our pocket down the road. If all I need to do to prevent further issues
    is to by only Chevron as was suggested, then so be it. Combined with the
    starting issue we had I wonder if there was a connection or if the fuel was
    the cause. . Tho, I don't have any reason to distrust the dealer. It would
    be nice to understand this issue. I should have them send me a copy of they
    service bulletin. I also read on Brickboard that a person had an 05, same
    mileage etc that the dealer told them the wrong valves were installed at the
    factory. The last Volvo ran 300k with no internal engine repair.Weird at

    This is an excerpt from the gm site.
    Where can TOP TIER Detergent Gasoline be purchased?
    The following marketers have met the TOP TIER Detergent Gasoline standards
    and are offering this product in all octane grades and in all their
    respective marketing areas:

    a.. Chevron
    b.. QuikTrip
    c.. ConocoPhillips (Conoco, Phillips 66, and 76 brands)
    d.. Shell
    e.. Entec Stations
    f.. MFA Oil Company (Break Time stores)
    g.. Kwik Trip, Inc. (Kwik Trip / Kwik Star)
    h.. The Somerset Refinery, Inc. (Somerset Oil)
    encat, Dec 28, 2005
  5. Chevron is the only fuel I know of that has Techron, a super fuel
    additive for keeping the valves clean. Also, to keep the valves clean
    one needs to drive the car for over 20 minutes and at highway speeds.
    If you have an oil temperature gauge you will see why the 20 minutes is
    important. It takes at least 15 minutes to warm the oil up. A 20
    minutes the oil has been running at temperature for a few minutes. We
    are lucky because everything is at least 20 minutes from our home. I
    have been using minimarket gas and haven't had any problems in by '01
    XC70 with 69,000 miles on it.
    Stephen Henning, Dec 28, 2005
  6. What ever happened to Mobil's ad stating to "Drive your engine clean"?
    Absolutely right about oil warm-up. Short drives just don't get the oil
    hot enough to "flash" off the water condensed in the pan after
    startup...a prime contributor to sludge in the oil pan. Enough moisture
    in the crankcase over a long enough period of time creates a colloidal
    suspension whereby the contents of the pan turn into a jelly-like, grey
    muck that literally has to be removed by dropping the pan. So much for
    the pristine 25,000 mile, ten year old Cadillac that was only used by an
    old lady to go to the pharmacist five blocks away.
    .................................................., Dec 29, 2005
  7. "........................................................"
    Like these pictures?
    Michael Pardee, Dec 30, 2005
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