1999 Deville Rear Sagging

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 2 of 2
Suspension, Brakes and Tires Discussion, 1999 Deville Rear Sagging in Item Specific Cadillac Discussion; Hey guys, this thing has me scratching my head. After much research on this board, i cant figure why the ...
  1. #1
    Eninety2 is offline Cadillac Owners Fanatic
    Automobile(s): 99 Deville
    Join Date
    Jun 2011

    1999 Deville Rear Sagging

    Hey guys, this thing has me scratching my head.

    After much research on this board, i cant figure why the rear of the car sits at least 2 inches too low. we initially lifted the vehicle and sprayed soapy water on everything. The passenger side air shock was leaking, so we replaced it with a new delco unit. the compressor works fine, it turns on with the car for about 30 seconds although the two lines that lead to the air filter had rotted away, they were replaced as well.
    The ride height sensor was also checked out and seems to be working. We disconnected it from the lever and swung the arm up and the air bags filled up. We lowered the vehicle and voila, it was at the correct ride height, although the ride was a bit rough.
    This was only done for testing around the block. Shocks arent supposed to determine ride height so the only conclusion i get to are the springs. And the ride height sensor a close second in line.

    New delco front struts are here and will be installed tomorrow. I also have a replacement set of rear springs from MOOG.

    Zero codes on the dash, even the history. And the only difference from now and and when one of the rear shocks was leaking was i would actually feel the car bottom out with a load on the rear and hitting a bump. No i dont, i actually feel some suspension travel. I was reading through ALLDATA and the shocks have a disclaimer that they max out @ 7 PSI, this is what lead me to believe it was the springs.

    Anyone have any ideas?

  2. Remove Advertisements

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 1999 Deville Rear Sagging

    It's either the rear springs OR you can go to a Cadillac dealer and pay for an Electronic Level Control height calibration. They use a GM Tech-II programer/diagnostic setup and it does a reset of the rear ride height.

    My ELC compressor sequence is: Key ON, 10 seconds later the compressor runs for a second or so to prove out and preload, then it only runs again if a load is placed in the trunk or rear seat. It does not, ever, run for 30 seconds.

    2002 Cadillac STS - (all the personal car info is missing from our profiles ^^^)

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts