90 Deville Suspension bounce

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Suspension, Brakes and Tires Discussion, 90 Deville Suspension bounce in Item Specific Cadillac Discussion; I have a 90 Deville that all of a sudden decided it wants to bounce severly in the rear. This ...
  1. #1
    90Deville is offline Cadillac Owners Member
    Automobile(s): 98 Deville
    Join Date
    Sep 2003

    Unhappy90 Deville Suspension bounce

    I have a 90 Deville that all of a sudden decided it wants to bounce severly in the rear.
    This came on all at once with no warning.
    The line from the air ride seems ok, I'll check again.
    Previously the compressor seemed to always run for several minutes when I get out of the car.
    I'm not sure how the system works and now it looks like its a problem.
    The engine also is making a growling noise that started at the same time (it sounds like I'm low on oil but thats not it.
    I don't have a manual (but am going to get a generic one somewhere)
    Any help would be appreciated.

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  3. #2
    Elvis's Avatar
    Elvis is offline Cadillac Owners Master
    Automobile(s): '05 Expedition
    Join Date
    Jan 2003

    Re: 90 Deville Suspension bounce

    This is just a guess from a logical thinker-

    The air ride compressor tries to pump up the shocks to a certain level based on pressure and level sensors, right?

    Maybe there's a seal or something blown in one or both of the shocks? The compressor keeps pumping, but never reaches the level it's seeking.

    With bad shocks, you're riding on springs, and they like to bounce. Properly functioning shocks prevent this.

    You can test this with the car parked--lean on each of the fenders a few times forcing the car into an artificial "bounce" state. When you quit doing this, the car should stabilize in a couple of short bounces, and NOT continue.

    Good luck, even though I'm a moderator, it does not certify expertise in any particular field of study.

  4. #3
    92_Deville_on_20's is offline Cadillac Owners Member
    Join Date
    Nov 2003

    Re: 90 Deville Suspension bounce

    I bought my car with around 170K on it about a year ago.

    One of the first things I did was replace the rear shocks and front struts and got the air leak in the rear shocks fixed, then I took it to get a 4 wheel aligment. The car rides like new ever since.

    If I can remember I paid about $200 for the rear shocks and 120 for the front shocks from Advance Auto. I installed them myself them paid about 100 buck to get a 4 wheel aligment and fixing a air leak in the air line.

    Installing the shocks/struts was not that hard at all if you have the right tools and have a little knowledge and know-how on auto repair. I also had a Hayes manual handy..

  5. #4
    90Deville is offline Cadillac Owners Member
    Automobile(s): 98 Deville
    Join Date
    Sep 2003
    Thread Starter

    WinkRe: 90 Deville Suspension bounce

    I have bought the new rear shocks with the air connection on them. I'm getting them put on in a day or two (if it doesn't snow)
    When I checked into the parts there was a listing for two options:
    rebuildable OEM or non-rebuildable.
    I bought the non-rebuildable (less expensive) because they could not determine if parts were available for a rebuild.
    This just added a little confusion to the effort.
    I am sure the ones I bought will work, just the thought of having rebuildable parts on the car was nice.

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