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940 Still has the IDLING shakes 900 1993

uid 18083's pic
posted by  lucid on  Sun Aug 31 05:03 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I'm hopingt that this post will better describe the shuddering vibration that's bugged me since I got this car 6 months ago. And maybe get me pointed towards a solution. Something is NOT RIGHT with this car.
Symptoms:

> A barely perceptible vibration when idling in Neutral
>The idling vibration increases to a very noticeable shudder when either Reverse or Drive is engaged (holding brake on)
>It can be felt throughout the car. Loose plastic bits begin to buzz when the frequency is right.

  • Road speed tends to mask it, but the buzz can be felt in the accellerator pedal (much like M+S tire "buzz" but I feel it's really the same idling vibration + load + speed)
    >It's annoying enough to make me shift into Neutral at long lights, to reduce it

    I first posted this as "Tranny Vibration", and replaced the motor mounts as suggested. Then I replaced the Tran mount also. At first, it may have improved somewhat with these changes, but now seems as severe as when I got the car in March. And I just checked the harmonic balancer with a timing light. All I can imagine is that:


    >Some engine "flaw" is being transmitted thru the (cheap MTC) mounts to the chassis
    >It's normal (?) 4 cylinder vibration that said Cheap MTC mounts can't mask (but I've never noticed this in other Volvos (240s))
    >Or maybe it really is something in the AW 71L? (my first, with no other complaints) I'll check the FAQ to see if I can access the torque converter bolts next


    I'm not pleased with this otherwise decent car (my 1st non-240), and am really grasping at straws here. Anyone have a clue?

    		•





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