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Suspension, Brakes and Tires Discussion, Shake Shimmy STS in Item Specific Cadillac Discussion; Find a tire shop with a Hunter 9700 wheel balancer and ask them to do a "road force test" and ...
  1. #46
    pink is offline Cadillac Owners Member
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    Re: Shake Shimmy STS

    Find a tire shop with a Hunter 9700 wheel balancer and ask them to do a "road force test" and to check for bent rims. If you hit any potholes, rocks, road edges, curbs, etc. then chances are a rim could be bent - they are fragile.

  2. #47
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    Re: Shake Shimmy STS


    I got news rims/tires and it took care of all kinds of little vibration problems....much bigger effect than I thought.

  3. #48
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    Exclamation Re: Shake Shimmy STS

    I dont think you read the postings....

    The 1998 and later Sevilles....and the 2000 later Devilles....seem to have a common vibration issue. If you have one of these cars, you know what I mean.

    Rims are ok, tires ok, Hunter balance yes.

    Everthing, steering rack, struts, control arms, engine, trans, is mounted to the engine cradle.

    Also, these engines do not use upper engine mount dog bones. They use 4 lower mounts as engine/trans mounts. Similar to a mid 90's Ford Taurus. Those cars also suffered from the 'jiggles.'

    To me, the engine cradle seems to be mounted too loose. I can easy flex the engine cradle while 'gently' prying on the cradle mounts. I can imagine the cradle moving/dancing around at any speed over 60.

    Hence the reason we asked someone, with the SAME car, to check the status of their cradle mounts.



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  4. #49
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    Re: Shake Shimmy STS

    If this does turn out to ba a major fix for the vibration issue, can these bushings be replaced without lowering the cradle. In other words, can you drop the bolts out, slide the old bushings out and slide the new ones in?

  5. #50
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    Re: Shake Shimmy STS

    Quote Originally Posted by tstach
    If this does turn out to ba a major fix for the vibration issue, can these bushings be replaced without lowering the cradle. In other words, can you drop the bolts out, slide the old bushings out and slide the new ones in?
    I would really like to know that also. Even if the cradle has to be lowered a little, it wouldn't be too difficult. But if it needs to come down several inches, it may be too much for the guy (like me) who has basic jack stands and jack.

    Don

  6. #51
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    Exclamation Re: Shake Shimmy STS

    The cradle will drop if you remove the 2 bolts. So far, I have been unable to get the mount(s) off the cradle.

    So basically, the sockets are still in (clamped between the car body and cradle).

    Also modified (stiffened) the upper strut bushings today.

    Test drove the car today with very good results! Minimal vibration! If you have one of these cars you will understand the following.....

    Warm day (73) The vibration seems worse in warmer weather.

    Very strong 30 mph head wind. The harder the head wind, the more it vibrates.

    Known road.

    The car drove better today than it has since I've owned it.

    I think the vibration can be blamed on too soft cradle and too soft upper strut mounts.




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  7. #52
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    Re: Shake Shimmy STS

    Quote Originally Posted by Logandiagnostic
    I dont think you read the postings....
    Have you read mine?
    All I said was changing the tires/rims fixed alot of my vibration problems.....in response to the post immediately preceding mine.

  8. #53
    PeteSTS is offline Cadillac Owners Member
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    Re: Shake Shimmy STS

    Quote Originally Posted by Logandiagnostic
    The cradle will drop if you remove the 2 bolts. So far, I have been unable to get the mount(s) off the cradle.

    So basically, the sockets are still in (clamped between the car body and cradle).

    Also modified (stiffened) the upper strut bushings today.

    Test drove the car today with very good results! Minimal vibration! If you have one of these cars you will understand the following.....

    Warm day (73) The vibration seems worse in warmer weather.

    Very strong 30 mph head wind. The harder the head wind, the more it vibrates.

    Known road.

    The car drove better today than it has since I've owned it.

    I think the vibration can be blamed on too soft cradle and too soft upper strut mounts.
    Logan when you say stiffened the upper strut mount do you mean replace, how would we stiffen it.
    I have a 2001 STS with same issues i've been trying to figure out.
    I will check my cradle mounts and do the socket trick.
    Pete

  9. #54
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    Re: Shake Shimmy STS

    Those VIN #'s from the Seville in the TSB do not match any numbers on my Seville's VIN. Does that mean that my Seville would be immune to these shakes and shimmy's people are complaining about and that that TSB is addressing?

  10. #55
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    Re: Shake Shimmy STS

    I cant figure out the VIN issue either. That was a copy and paste from the GM service CD.

    As for the strut mount. Here is a original strut picture from another post.

    As the car is running, turn the steering a bunch and watch these upper mount 'bowls'....I think you will see a bunch of movement in the rubber......

  11. #56
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    Exclamation Re: Shake Shimmy STS

    Here is the temporary fix.

    Remove the strut nut. This can be done on the car without spring compressors etc.

    I basically flipped the washer 'bowl.' I did use a stack of large washers under the bowl to fill the gap between the strut rod and the underside of the washer bowl.

    But, this effectively tightens the upper mount dancing issue. The flipped bowl washer locks to the upper mount.


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  12. #57
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    Re: Shake Shimmy STS

    Quote Originally Posted by iametarq
    Those VIN #'s from the Seville in the TSB do not match any numbers on my Seville's VIN. Does that mean that my Seville would be immune to these shakes and shimmy's people are complaining about and that that TSB is addressing?
    Basically, the bulletin is saying use the new control arms on 98+ Sevilles built before VIN#3U247643. In otherwords, a Seville built before March of 2003 doesn't have the new arms while the ones built from then on do.

  13. #58
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    Re: Shake Shimmy STS

    Quote Originally Posted by Logandiagnostic
    Here is the temporary fix.

    Remove the strut nut. This can be done on the car without spring compressors etc.

    I basically flipped the washer 'bowl.' I did use a stack of large washers under the bowl to fill the gap between the strut rod and the underside of the washer bowl.

    But, this effectively tightens the upper mount dancing issue. The flipped bowl washer locks to the upper mount.


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    ha! Actually your first photo is one I took this weekend when I replaced my struts! in your 2nd picture with the bowl upside down, that is actually how I installed one of them, then realizing my 'error' i flipped to be like a bowl again.

    should i have left it as an upside down bowl?

  14. #59
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    Exclamation Re: Shake Shimmy STS

    No, it is a tempory fix to isolate the vibration issue in these cars!

    Please somebody.....pay attention to the original post......

    We are trying to root cause the vibration issue......NOT that we used your pic from last week......good pic BTW.

    we dont know the fix yet......thats why we have members try these mods!!

  15. #60
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    Re: Shake Shimmy STS

    Logan, it seems that this vibration affects mostly Seville's, and a few Deville's. One thing that I do not beliveve was addressed. What is different (cradle, suspension, etc) from the Seville's to the Deville's? That may well hold the answer. I do not know enough about these cars, to know the differences. Maybe you, or someone else, knows.

    Don

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