Rough ride like race car
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Cadillac STS Forum - 2005 through 2012 Discussion, Rough ride like race car in Past Cadillac Vehicle Discussion; My 2005 sts v8 luxury sport(130000 miles) rides very rough on most roads. The ride is not floating. I have ...
  1. #1
    danscan is offline Cadillac Owners Member
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    Rough ride like race car

    My 2005 sts v8 luxury sport(130000 miles) rides very rough on most roads. The ride is not floating. I have changed the sport settings but noticed no change. I believe it has the magnetic ride control o(or something like that). How can improve the ride? Tires? Shocks? Computer update?

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  3. #2
    Eldo1953's Avatar
    Eldo1953 is offline Cadillac Owners Enthusiast
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    Trade in on a DTS.

  4. #3
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Rough ride like race car

    The car is built for handling and control rather than pampering your candy butt. You should have bought a DTS. Didn't you take a test drive before buying it?
    Don't mess with Binky Bear!


  5. #4
    ETC92Guy is offline Cadillac Owners Member
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    Gentlemen.....puleez!!!

    Now on to the question at hand.... has this been a constant condition or something that degraded over time. Check your tire pressure with a good quality gauge, not the pressures from the tpms. Over inflation makes the car ride like there are no springs at all.

  6. #5
    danscan is offline Cadillac Owners Member
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    Re: Rough ride like race car

    I have owned the car for 6 years and it did not ride like this when I bought it (then again my wife took it has her daily driver about 2 weeks after I bought it and I did not get it back until last may). It rides as hard as my Cobra did with a Steeda handling kit. On the old concrete roads of New Jersey it really transmits the any inconsistency in the road. I drove people to lunch and they too complained that it was riding like a corvette. Which would be fine if it was in sport but it was in touring.

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    Re: Rough ride like race car

    FWIW, My F55 2002.5 STS does NOT have a "Cadillac marshmallow ride". You can feel every stripe in the road. If the car was not "tight" I never would have bought it......... and that equates to "Different strokes for different folks !".

    Have you tried running the tire pressures at 30 psi, cold ? (No idea what your driver's door tire spec sticker says.)

  8. #7
    jasonjsimon is offline Cadillac Owners Member
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    Re: Rough ride like race car

    I've noticed mine getting the same way. Ride has progressively become more rough. I guess it is time to look at the shocks.

  9. #8
    edoubble2082 is offline Cadillac Owners Member
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    Re: Rough ride like race car

    Makes me feel better that others feel the same way I'm at 130k and thought I had to replace ASAP little bit rough dosent really bother me i just through on some new toyo tires feels like I got new shocks

  10. #9
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Rough ride like race car

    Here in Norhtern Alaska the roads are one frost heave and crack after another. A car with a boulevard ride bottoms out regularly. With my STS with MRC I don't even have to slow down. If the pavement seams bother you, you aren't driving fast enough. All that stuff smooths out about 80MPH. My wife sometimes complains but then she'll get behind the wheel of some crapbox rental car and that will quiet here down for about six months. The MRC is amazing the way it handles roads with uneven surfaces.
    Don't mess with Binky Bear!


  11. #10
    danscan is offline Cadillac Owners Member
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    Re: Rough ride like race car

    lets pretend that something is causing it to ride very hard. What could that be? Tires are one option. Could shocks especially the MRC version cause it to ride more rough then it should?

  12. #11
    eatyoursandwich is offline Cadillac Owners Fanatic
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    Re: Rough ride like race car

    Quote Originally Posted by danscan View Post
    lets pretend that something is causing it to ride very hard. What could that be? Tires are one option. Could shocks especially the MRC version cause it to ride more rough then it should?
    Motor mounts. Prone to failure in these models or most models with 130000miles for that matter. Could be a bad shock, a bad bushing - honestly it could be a lot of things with that amount of miles. Some of your intake bolts could be lose. Bad MRC shocks are definitely a possibility - the main problem is not the parts (only around $1500/pair), it's the labor involved. IIRC, they not only have to replace the shocks, but recalibrate a few things.

    Motor mounts are equally as hard to access and replace.

  13. #12
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
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    Re: Rough ride like race car

    When my MRC strut went bad it bottomed out on speed bumps and such.

  14. #13
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Rough ride like race car

    has your oil been leaking at all from the MRC struts?
    Mine looked like this:

    Front Passenger's:
    This one was leaking for a while as you can see the oil from the shock had time to 'soak' into the metal a little...




    Rear Driver's:
    Caught this one early after it began to fail:




    I've also seen documentation that some leaking is normal on the MRC shocks.

    I understand basically if they aren't leaking they are just as good as brand new ones are ... they aren't supposed to 'wear out' basically.
    I could be wrong in that understanding so please take it with a grain of salt.

  15. #14
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Rough ride like race car

    All good info above. But lets get basic. Is this an AWD? All AWD's transmit more road imperfections back to the car.

    It does sound like it could have changed gradualy over time and the OP would just have noticed it more dramatically because of the car trade. I'm not sure everyone would agree that road maintenance has become a laughing matter since brand new roads are rougher than the 30-year-old ones they replace. But the secondary raods near me have been crumbling while roads that don't need repair are resurfaced.

    If you have Touring and Performance settings, you have MRC. RPO code FE3 on the label affixed to the spare tire cover tells the same story. That's where the above is handy.

    I hate the rock-hard OEM Michelins. Ride starts with tires. If you're serious about fixing the problem and it isn't the shocks, buy softer, higher-profile tires. I run 235/50R18 Continental DWS at 30 PSI; sometimes a bit less in back.

    After tires & shocks, maybe somethjing is wrong with the load-leveling system. Working up through the suspension; anti-roll bar(s), springs, control arms and on up the drive-train to the motor mounts like mentioned above. Your position is the opposite of that of a racer trying to improve ever aspect of handling & road-feel; but the process is the same. Work from the bottom up.

  16. #15
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    RPO code F55 indicates MRC, FE3 is the springs...My 04 CTS had FE3 springs with the self leveling Nivomat shocks.
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