Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Join Date
    Jun 2010
    Location
    Dartmouth, Nova Scotia, Canada
    Posts
    157

    Default Intermittent Rumble/Vibration

    Every now and then, our Volvo (2003 XC 2.5t, 200,000 km, Auto) will rumble. At low speeds it isn't noticeable, but as the car accelerates the rumbling becomes more pronounced. Bringing the car to a halt and then resuming the journey clears it. Backing off the gas, and braking (without coming to complete halt) have no effect.

    When the car first attains the speed at which the rumble is noticeable, it is similar to the labouring of a car with a manual transmission in too high a gear, but if I continue to accelerate, it becomes stronger.

    Since buying the car in June of this year, the only significant work performed was the replacement of the timing belt and water pump.

    Ideas?

  2. #2
    Join Date
    Jun 2010
    Location
    Dartmouth, Nova Scotia, Canada
    Posts
    157

    Default

    Some help here would be welcome. I am taking the car in for service next week and I am sure that the only way my mechanic will be able to solve this (rather mysterious) problem is if I can point him in the right direction.

  3. #3
    Join Date
    Aug 2009
    Location
    Great Falls, MT
    Posts
    185

    Default

    Sounds like it could be a bad wheel bearing. Those tend to rumble and makes sounds similar to that. Try turning at speed (45mph or so) and see it is more pronounced when making a turn either direction. Hope that helps!

  4. #4
    Join Date
    Sep 2009
    Location
    Pottstown, Pa
    Posts
    176

    Default Resonance?

    Also check your engine mounts, worn mounts have been known to be a source of harmonic resonance through the frame

  5. #5
    Join Date
    Jun 2010
    Location
    Dartmouth, Nova Scotia, Canada
    Posts
    157

    Default

    Quote Originally Posted by javaxc70 View Post
    Sounds like it could be a bad wheel bearing. Those tend to rumble and makes sounds similar to that. Try turning at speed (45mph or so) and see it is more pronounced when making a turn either direction. Hope that helps!
    I don't think it's a bearing as it does not occur with any regularity.

    Quote Originally Posted by Q-ship View Post
    Also check your engine mounts, worn mounts have been known to be a source of harmonic resonance through the frame
    I hope it's this. The way it increases in intensity with increased speed seems to jibe with this idea.

  6. #6
    Join Date
    Apr 2003
    Location
    Devon PA
    Posts
    11,409

    Default

    Check the lower front motor mount (right side of car)
    When they collapse the engine can actually sit on the subframe and transmit all sorts of noises and vibrations (not to mention a rumble).

  7. #7
    Join Date
    Jun 2010
    Location
    Dartmouth, Nova Scotia, Canada
    Posts
    157

    Default

    Quote Originally Posted by JRL View Post
    Check the lower front motor mount (right side of car)
    When they collapse the engine can actually sit on the subframe and transmit all sorts of noises and vibrations (not to mention a rumble).
    right side, when facing the front of the car

    or

    right side, when seated in the car

    edit:
    Which one?

  8. #8
    Join Date
    Feb 2003
    Location
    Dimock, PA
    Posts
    1,559

    Default

    I believe what JRL is referring to is the right side as you are sitting in the car, part B in the diagram.
    Bill
    63 PV544 (attempted restoration)
    83 245 DL OSD (transferred to son)
    85 240 GL OSD (transferred to son)
    03 XC70 OSD (traded-in 4/12)
    05 AWD S80 OSD (transferred to son)
    12 XC70 T6
    16 S60 T5 Drive-E (FWD)

  9. #9
    Join Date
    Apr 2003
    Location
    Devon PA
    Posts
    11,409

    Default

    That would be B
    Right side of the car is the right side of the car
    Who said anything about sitting or facing in front?

  10. #10
    Join Date
    Jun 2010
    Location
    Dartmouth, Nova Scotia, Canada
    Posts
    157

    Default

    With the exception of one's own hands, left and right always have the potential to be ambiguous. That's why sailors and pilots use port and starboard, (respectively left and right, when aboard a vessel and facing the bow).

    In any case, I am grateful for your assistance.

Page 1 of 2 12 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •