'84 240 vibration at idle PLEASE HELP!!!

Discussion in 'Volvo 240' started by Ricardo, Apr 2, 2004.

  1. Ricardo

    Ricardo Guest

    I have a 1984 240 gl with 115,000 mi. on it, I have had a horrific
    time trying to diagnosis this problem. The engine has a "rough idle
    and shake" at the end of its cycle, there is also a vibration that
    steadily increase up to about 1500 rpm. I have a laundry list of parts
    and services that have been done, mostly by the dealer to no avail.
    The dealer has been no help, and they have told me that the car is
    just "old". If anyone has any ideas or experience with this please
    HELP!
     
    Ricardo, Apr 2, 2004
    #1
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  2. Ricardo

    Rod Gray Guest

    The fuel window on those cars is very narrow, which means that the throttle
    body must be clean and set up properly. Go to your local Volvo dealer, walk
    into the shop and find a tech who does side work. Doing this pays 1 hour,
    but can be done in 15 minutes and makes an amazing difference in how the car
    runs.
     
    Rod Gray, Apr 3, 2004
    #2
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  3. Ricardo

    Rojo2G Guest

    I have heard that the motor mounts on 240 's are notorious for breaking. Mine
    had two broken ones but the idle was still normal.
    Rojo
     
    Rojo2G, Apr 3, 2004
    #3
  4. Ricardo

    Handywired Guest

    I'd guess a bad motor and/or tranny mount. Mine went at about 125K. Not an
    expensive or difficult fix.

    -jeff
     
    Handywired, Apr 3, 2004
    #4
  5. Ricardo

    Handywired Guest

    I have a 1984 240 gl with 115,000 mi. on it, I have had a horrific
    It could be the motor or tranny mounts, but you'd think they would have caught
    that. On my '92, I had this thing happend where the exhaust was hitting but
    only when the engine was loaded up, and it created a vibration that was very
    difficult to diagnose...

    -jeff
     
    Handywired, Apr 3, 2004
    #5
  6. Ricardo

    Rojo2G Guest

    there is also a vibration that steadily increase >up to about 1500 rpm
    Another thought I have. I had a rough idle and it turned out to be corroded
    spark plug wires (just two). I would recomend checking the spark wires
    especially if they are old. Mine weren't but in washing the engine, months ago,
    water must have gotten inside the caps and corroded them. The sign was a white
    powder packing inside the caps. I cleaned them, no difference, replaced them
    and the car idles and runs fine.
    Best of luck, Rojo
     
    Rojo2G, Apr 3, 2004
    #6
  7. Ricardo

    Ricardo Guest

    Turns out it was the throttle plate and throttle switch, after a lot
    of complaining, the dealer did this for free! They also replaced the
    coolant temp sensor, there is still a bit of a vibration, so I need to
    check out the motor mounts, thanks for all the help.
     
    Ricardo, Apr 7, 2004
    #7
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