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Vibration - Flywheel? Converter? Harmonic balancer?

This is a discussion on Vibration - Flywheel? Converter? Harmonic balancer? within the External Engine forums, part of the LSx Technical Help Section category; 2000 SS A4 1. Vibration in Park and Neutral @ 1,450 RPM 2. Vibration when taking off slowly, at the ...

  1. #1
    LS1 or bust b.lee's Avatar
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    Vibration - Flywheel? Converter? Harmonic balancer?

    2000 SS A4

    1. Vibration in Park and Neutral @ 1,450 RPM

    2. Vibration when taking off slowly, at the top of 1st, 2nd, D and OD (Every time the car hits 1,450 RPM)

    3. Vibration on deceleration around 45-50 mph (1,450 RPM)

    4. It runs pretty smooth otherwise, the vibration will go away depending on speed / RPM.


    - Engine doesn't flop around when brake torquing a little in Drive or Reverse.
    - Trans mount seems fine, Trans not hitting tunnel when shifting in/out of gear
    - Bangs thru all the gears fine, runs out good, no codes for misfire.
    - Stock engine mounts, Stock Trans mount


    Mechanic is trying to tell me I should try injectors and plugs
    I'm thinking not because it vibrates on deceleration with foot off of gas pedal
    Maybe the flywheel or converter? OR bad harmonic balancer?

    Would a bad harmonic balancer cause these types of vibrations?
    Or would the stock engine mounts soak up the vibration and make it un-noticeable?

    I'm searching around but any help would be much appreciated

  2. #2
    Senior Member 98TransAmWs-6's Avatar
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    Any codes at all? If it was an injector issue, most likely it would throw a code.
    1998 Trans Am WS6 - Phantom
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  3. #3
    LS1 or bust b.lee's Avatar
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    No just rear 02 code and AIR pump code...

    Runs good, good power, I'm thinking the spark/injector issue could be ruled out since it does the same vibration on deceleration?

    It feels like a circular motion type vibration, I've felt misfires before on other vehicles and I've been wrong before but I don't believe it is a misfire.

  4. #4
    LS1 or bust b.lee's Avatar
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    Anyone hear of the Flex plate or Torque Converter causing vibrations in A4 cars?
    Is it a common problem?

  5. #5
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    vibration

    I would have the converter check for balance,had 1 out of balance and would vibrate reving in park and neutral changed out and vibration gone

  6. #6
    LS1 or bust b.lee's Avatar
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    Quote Originally Posted by 40delivery View Post
    I would have the converter check for balance,had 1 out of balance and would vibrate reving in park and neutral changed out and vibration gone
    Is it possible to "check" or "test" a converter and see if it is out of balance?
    Did you have yours checked or just replaced it?

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