: 2007 Cadillac STS V8 WORST RIDE QUALITY! Help!



Karsntrux
04-06-13, 04:15 PM
I'm in a jam here. I LOOVE my 2007 Cadillac STS V8 RWD, F55 Magenride, with Sport Suspension, I believe FE3. It's what I believe to be on of the rarer cars, 6 Lug Wheels and Hubs, which I've been told is from the CTS V, but mine are stock. Brembo Brakes front and rear. Not a V. All stock. EG Grille and Body Kit.
I love this car, but this is the worst ride quality I've ever felt in my life. I'm a used car dealer and I drove every type of 05-07 STS they sell prior to buying this one. MagneRide and Standard. All of which rode acceptable to me. Some better than others. I purchased this one, cheap, assuming the suspension was bad. 3 Cadillac dealers later, 2 independent shops later, all I've been told is my suspension is perfectly fine. As I said I'm a car dealer, and I drive more than my fair share of vehicles. Never in my life have I been in a car that rides so poorly. Even at 10mph, it absorbs no impact. Every bump shakes the entire vehicle. I feel no difference between Touring and Perf. modes. No leaks. No error codes.
My questions are as follows. Does anyone else feel the same way about their STS? Is there some mysterious issue that can go un detected to cause this? Am I just SOL? If this is "Just how it rides." Which I truly just do not believe. If that is so, is it possible or feasible, to convert this car to a softer suspension, say base FE1/FE2, but using a simulator computer and base STS suspension setup, magnetic or not.
I love everything about this car, minus the ride quality. I don't mind spending the dough to do the swap properly, if it's possible. As I said, I purchased this car at a steal of a price, from a man that just needed the cash.
Any help is greatly appreciated. Thank you!
106324

Submariner409
04-06-13, 05:08 PM
You need to drive a 2002.5 - 2003 STS. They were the test mules for the GM/Ferrari MRC system and their ride is anything but a "Cadillac ride". Love it ...........

You're a dealer - do you have a code scanner test set ??? Look for suspension codes - you should be able to vary suspension stiffness in your car - wish I could.

Karsntrux
04-06-13, 05:14 PM
I have to disagree, we just had a nice 2003 STS on the lot with MRC. I've had a few now to date. 180,000 miles to boot, and though it's not plush as a CVRSS car like my DHS, it's still a very comfortable ride. In all honesty, I would be exceptionally pleased with that type of ride quality LoL. I would be very pleased with just the base 05-07 STS suspension. Compared to the way this 2007 rides, a 2003 with MRC is truly a BOAT ride. LoL

wake
04-06-13, 05:27 PM
I had a magride 03 STS before my 07 V. I much preferred the ride of the 03. The 07 is much more fun to drive however. :p

1BadCadSTS
04-06-13, 06:17 PM
You have 180k on your sts?

Sounds like blown struts to me.

You have the performance handling package. Gave the car sts v brakes summer only tires and strut bar.

Karsntrux
04-06-13, 08:08 PM
No, I was talking about a 2003 sts I have on my lot with 180k. My 07 sts only has 70k. I just recently replaced the tires with a really soft compound, especially built for ride quality hoping that would help. I was hoping the struts were bad, but 5 different places have told me otherwise. The worst part is for that harsh of a ride the car doesn't handle exceptionally well. Always feels like it's skating over bumps, not stuck to the road as I've heard my suspension package should do.

1BadCadSTS
04-06-13, 08:12 PM
Where are you located?

Check the sway bar links and control arm bushings are a common issue.

Mr.electric
04-06-13, 08:29 PM
Maybe it has the wrong springs. Is the ride height too high. I had a 4runner that felt like it had wheels made of stone. I pulled out the last two leaf springs from the aftermarket heavy duty rear springs and it was at least driveable. The magnetic suspension could certainly be at fault but that would probably set a code. As a dealership mechanic at Toyota I have seen some very obscure hard to pin down issues that don't throw codes. Things like swapped vacuum lines or swapped wires in a plug housing can cause wired issues. It may be painful but you might be better off throwing on 4 standard non magnetic struts and springs and leaving the suspension light blinking to regain ride quality or just sell it.

dannyquest
04-06-13, 09:44 PM
Karsntrux, What size tires, Brand of tires & air pressure. On a smooth road how is the ride, Any viberation .Once I had one tire on my truck repaired & rebalance, that wheel jumped like crazy. Taken to another shop and balance again. It was fine after that. Danny

EChas3
04-06-13, 10:53 PM
If this car has the rare factory option (available only on 2007 Platinum and by special order on later cars) with the V brakes & hubs, it's the highest performance suspension available on any STS; MRC isn't available on the V. Sell it emphasizing the Performance angle over Luxury.

I'd be really surprised if the MRC shocks were bad w/o leaking or setting an idiot light.

If you're intent on blunting the handling and softening the ride, Danny has the solution. Replace the tires with higher profile and sofeter compounds and lower the pressures. On my AWD w' MRC, I sometimes run as low as 29 front & 28 back.

Sorry you don't appreciate it. If Platinums had ACC, I'd have some interest.

wake
04-07-13, 12:19 AM
Always feels like it's skating over bumps, not stuck to the road as I've heard my suspension package should do.

Hmmmm, someting is defainately wrong with the suspension if it feels like you describe.

Surprisingly, I found dealerships don't seem to know much about the vehicles they service.

I'm getting ready to rebuild the suspension on my Escalade because the ride is so bad. Two different GM dealerships, one Caddy and one Chevy dealership said nothing is wrong. I've driven a couple of Escalades and a Denali neither had the ride quality problems I have. I also found my steering box to have play in it and cured quite a bit of problems I had with it by making a slight adjustment to it.

I just finished rebuilding the suspension on my 98 Olds Aurora. No shops found any issues with it but when I removed the front struts and set them aside with no weight sitting on them I saw the strut compress itself, I could pull and push the strut like a plunger, absolutely no resistance. I also found the control arms loose and the sway bar bushing cracked and compressed.

I rebuilt the suspension on my previous SUV, an 02 Trailblazer. Nobody found anything wrong with the suspension but after I rebuilt it, it rode and handled like a brand new vehicle.

If it's floating and feeling disconnected from the road then it sounds like struts to me.

1BadCadSTS
04-07-13, 01:41 AM
Maybe it has the wrong springs. Is the ride height too high. I had a 4runner that felt like it had wheels made of stone. I pulled out the last two leaf springs from the aftermarket heavy duty rear springs and it was at least driveable. The magnetic suspension could certainly be at fault but that would probably set a code. As a dealership mechanic at Toyota I have seen some very obscure hard to pin down issues that don't throw codes. Things like swapped vacuum lines or swapped wires in a plug housing can cause wired issues. It may be painful but you might be better off throwing on 4 standard non magnetic struts and springs and leaving the suspension light blinking to regain ride quality or just sell it.

Where are you located?

chachd
04-07-13, 10:43 AM
Where are you located?On his post it says Columbus, Ohio!!

1BadCadSTS
04-07-13, 11:03 AM
Can't see that on mobile


I'm western pa if you wanna come take mine for a ride.

Karsntrux
04-07-13, 11:51 AM
Thank you all for the great replies. I'm running sumitomo tour plus lsw 2454518 not z rated. At 28 lbs/tire. If you look at my pic here the car sits much higher in the rear than most that I see. The car doesn't float at all actually. It doesn't bounce. It's super stiff and absorbs no shock whatsoever even the tiniest bumps send shock waves through the entire car. Even when I drive it hard and corner hard it doesn't handle very well. Any bump while cornering at speed sends the rear end sideways and triggers stability. It always feels like its skating on ice. I can drive my corvette 90 mph over a bump on 270 and its fine. I go over that same bump at 60 in the Sts and it sends me 4 inches above my seat. Car doesn't bounce but no impact is absorbed and it makes me fly out of my seat. It's very harsh. Thanks for all the info guys.

To my knowledge, it's a lux perf, v8 rwd. Rpo f55 fe3, it has 4 struts, 4 shocks, tons of sway bars, brembo brakes, 18 inch 6 lug wheels. 106405

Karsntrux
04-07-13, 11:56 AM
Btw, it's also not a platinum to my knowledge. Interior doesn't match the other platinum a I've seen. In all honest I've seen 1000s of Sts and I've never once seen another with my wheels and brakes. Maybe I'm just not looking properly

dannyquest
04-07-13, 12:25 PM
Karnstrux, Where on I-270 can you go 90mph. I live close to Grove city by the south outer belt. That must be it. Motor cycles Join the 200 club on that area,( 200mph). Danny

Karsntrux
04-07-13, 01:50 PM
Haha yep! Alum creek 270. I get on 270 from alum creek and whomp down and fly to south high where I get off 270. Rarely see any state patrol from alum creek to 71

EChas3
04-07-13, 02:29 PM
Have you tested the leveling system? Maybe a DPO monkeyed with the sensors.

----------

Shock/struts don't hold a car up, but springs and levelers do. I doubt someone would install heavier springs. Somebody might mess with a leveler system.

1BadCadSTS
04-07-13, 07:05 PM
Btw, it's also not a platinum to my knowledge. Interior doesn't match the other platinum a I've seen. In all honest I've seen 1000s of Sts and I've never once seen another with my wheels and brakes. Maybe I'm just not looking properly

You won't

Very rare option. Gladly swap you my 05 with 20k less miles for yours with it hahaha.

maiahsdad
04-08-13, 06:52 AM
[QUOTE="Karsntrux"]
My questions are as follows. Does anyone else feel the same way about their STS? /QUOTE]
Yes. If I run over a quarter in the street, it shakes the entire vehicle. It's like driving a sled.

Carvone
04-08-13, 11:08 AM
I have a 2007 STS V8 with every known option available for that year including the performance package you have on yours.
I have owned a couple of Cadillac's in the past and I will say this car is more of a sportier ride than the traditional "Caddy" ride, but is no where near what you are describing. The only way a dealer checks for bad struts is to look if they are leaking, no leaks means a good strut to them. A few months ago I had the dealer replace my leaking front struts under warranty, it really tightened the car up. With the old struts I couldn't feel a difference between Touring and Performance but with the new struts it is night and day. I would look into your struts and springs if it is that harsh.
Here'e mine -
106459

Carvone
04-08-13, 12:57 PM
If this car has the rare factory option (available only on 2007 Platinum and by special order on later cars) with the V brakes & hubs, it's the highest performance suspension available on any STS;

Sorry you don't appreciate it. If Platinums had ACC, I'd have some interest.

EChas3......So are you saying only the "Platnium" STS's could get these wheels and brakes in 2007? Also, as you can see my 2007 has the wheels / brakes and it also has the ACC w/ HUD.??

1BadCadSTS
04-08-13, 05:42 PM
Was not available with Platniums ever to my knowledge.

Karsntrux
04-08-13, 07:04 PM
I have a 2007 STS V8 with every known option available for that year including the performance package you have on yours.
I have owned a couple of Cadillac's in the past and I will say this car is more of a sportier ride than the traditional "Caddy" ride, but is no where near what you are describing. The only way a dealer checks for bad struts is to look if they are leaking, no leaks means a good strut to them. A few months ago I had the dealer replace my leaking front struts under warranty, it really tightened the car up. With the old struts I couldn't feel a difference between Touring and Performance but with the new struts it is night and day. I would look into your struts and springs if it is that harsh.
Here'e mine -
106459

AWESOME! Thanks! I'm really happy to see another! I have looked at 1000's of pictures on the internet just trying to find another like mine. I'm so tired of being told "It's just the way the car is." If you have one, and yours doesn't ride like mine, I believe there's a problem. Was yours similar to what I was describing, like skating on ice? Prior to replacing the struts?
Another odd question, does your STS have a wood grain strip down the center of the gear selector? Mine doesn't, and every one I see with wood trim has it. I have all the other wood trim, just not on the gear selector.

EChas3
04-08-13, 08:41 PM
Perhaps I'm thinking of the later Platinums that could get the 6-lug wheel/V-brake setup. 2007 Platinum was not available with ACC.

Your grille is not not OEM. If you didn't do the mod, who knows how much of your car really is OEM. Have you ever had the VIN run or checked the tag on the spare tire cover?

Tourist
04-08-13, 11:20 PM
I would also add my two cents to check the leveling system. While it was not on a Cadillac, the lever that told the system when it was level came loose on my STE, and driving the car felt like it had no springs. Every bump was like riding a pogo stick. We re-attached the lever, the system changed from inflated to the stops to the proper setting, and the car's ride became normal again. What you are describing sounds the same. Good luck with your problem.

Karsntrux
04-09-13, 10:40 AM
I would also add my two cents to check the leveling system. While it was not on a Cadillac, the lever that told the system when it was level came loose on my STE, and driving the car felt like it had no springs. Every bump was like riding a pogo stick. We re-attached the lever, the system changed from inflated to the stops to the proper setting, and the car's ride became normal again. What you are describing sounds the same. Good luck with your problem.

Do you know if the STS leveling system is similar to the old CVRSS systems? I know in either my Seville or DHS, if I sit on the trunk, the air ride instantly kicks on, and pumps the rear up and when i get off the trunk, the air dissapates. I played around last night sitting on my STS trunk and never heard it kick on, in fact I tried to jump around while on my trunk and I couldn't get the shocks to move 1/2 inch, like it was just stuck at that height. People always ask me if my car is supposed to sit that high in the rear, because it seems like it sits higher in the rear than anyone elses. Even the ones with PCZ package. It rides like an old work van with heavy duty shocks that are jacked all the way up, if anyone is familliar with the old C3500 Work Vans, that had the crazy stiff shocks.

My biggest issue is finding someone knowledgable enough to help me. The dealers know less than most independent shops around here. I spoke to someone at IPS racing here in Columbus, and he felt very confident he could help me. They do a lot of work on MRC Corvettes, including MRC Deletes, Mods, and Conversions. So I'm hoping they can help. I'm confident this isn't the way my car is supposed to be, and I'm also confident it's something stupid, like the level system, non OEM springs, bad programming, something of that nature. Wish me luck!

Thank you guys for all your help and input. Greatly appreciated.

1BadCadSTS
04-09-13, 10:43 AM
Similar in that it has a level sensor with a rod connected between the body and lower a arm to detect ride height. Other than that magnetic ride control is competely different then cvrss (continuously varying road sensing suspension).

I'm in Pittsburgh and am pretty damn good with these cars. Again other than braking systems we have the same car welcome to come compare.

Karsntrux
04-09-13, 11:13 AM
Similar in that it has a level sensor with a rod connected between the body and lower a arm to detect ride height. Other than that magnetic ride control is competely different then cvrss (continuously varying road sensing suspension).

I'm in Pittsburgh and am pretty damn good with these cars. Again other than braking systems we have the same car welcome to come compare.

I come to washington, pa pretty often, I have standardbred racehorses, PM your number, I would love to check yours out next time I come up. Appreciate that.

1BadCadSTS
04-09-13, 11:16 AM
My dad use to run many horses down at mountianeer! He only has one now though.

Carvone
04-09-13, 02:21 PM
Was yours similar to what I was describing, like skating on ice? Prior to replacing the struts?
Another odd question, does your STS have a wood grain strip down the center of the gear selector? Mine doesn't, and every one I see with wood trim has it. I have all the other wood trim, just not on the gear selector.

No my car did not ride anything like you describe, even with bad front struts. I do think "Tourist" is on too something though, it sounds 'from what you describe' that the rear shocks are all the way aired up and making it ride like that C3500 work van. Go check out that place that does MRC work and they would be able to tell you what is wrong within the hour most likely. Also your likely to get off relatively cheap, sounds like the shocks are doing their job and it is the air pump or switch that is defective. (just guessing though)

Yes, my gear shift has the same wood grain in the middle of the knob as is on the dash, console and doors. You easily switch that out on yours if you ever run across one you like at a junk yard or on ebay. Good Luck.

EChas3
04-09-13, 08:18 PM
There are two different systems on the STS, depending on the suspension options.

The tests you describe indicate serious issues that any dealer should be able to fix.

jimmbo
04-13-13, 03:01 AM
These cars ride like they have wooden tires

Ludacrisvp
04-13-13, 06:19 PM
These cars ride like they have wooden tires

Lol indeed

Billysurcan
08-18-15, 03:47 PM
My 2007 acts exactly the same. I'm told the front struts are gone but I'm not sure. Mine doesn't respond to the ride switch from touring to perf.
I have found that if I disconnect the battery, and cause the onboard computer to reboot that the car seams to ride better for a short time.
The computer is suppose to read the shocks 1000 times a min., and I wander if the computer is at fault. The car doesn't appear to be sitting low
but rides as if the front has no shocks at all.

MIVet28
08-24-15, 12:00 PM
Karsntrux, I had the exact same issues with the 06 1SG I bought last August. EVERY single bump, crack or manhole cover would make the car shutter and feel like it was going to explode. I was considering selling the car, but, to my surprise, the front lower control arm bushings were destroyed. Once I replaced them(replaced both LCAs), it was much much better. At the time, the struts were all aftermarket and the previous owner had applied the ole resistor trick to all four corners. I replaced all four with OEM struts and the ride improved greatly, but a break in the wiring at the front right wheel speed sensor was preventing the ABS, T/C, stability system and adaptive cruise control from coming on. I got that straightened out this weekend and everything came back to life. This car is riding beautifully now. One last fix I have yet to do is replace the air lines for the rear leveling system. I'm expecting an even better ride by next Sunday when that's complete.

Hope this helps!

2manyhotrods
08-24-15, 12:16 PM
I'm in a jam here. I LOOVE my 2007 Cadillac STS V8 RWD, F55 Magenride, with Sport Suspension, I believe FE3. It's what I believe to be on of the rarer cars, 6 Lug Wheels and Hubs, which I've been told is from the CTS V, but mine are stock. Brembo Brakes front and rear. Not a V. All stock. EG Grille and Body Kit.
I love this car, but this is the worst ride quality I've ever felt in my life. I'm a used car dealer and I drove every type of 05-07 STS they sell prior to buying this one. MagneRide and Standard. All of which rode acceptable to me. Some better than others. I purchased this one, cheap, assuming the suspension was bad. 3 Cadillac dealers later, 2 independent shops later, all I've been told is my suspension is perfectly fine. As I said I'm a car dealer, and I drive more than my fair share of vehicles. Never in my life have I been in a car that rides so poorly. Even at 10mph, it absorbs no impact. Every bump shakes the entire vehicle. I feel no difference between Touring and Perf. modes. No leaks. No error codes.
My questions are as follows. Does anyone else feel the same way about their STS? Is there some mysterious issue that can go un detected to cause this? Am I just SOL? If this is "Just how it rides." Which I truly just do not believe. If that is so, is it possible or feasible, to convert this car to a softer suspension, say base FE1/FE2, but using a simulator computer and base STS suspension setup, magnetic or not.
I love everything about this car, minus the ride quality. I don't mind spending the dough to do the swap properly, if it's possible. As I said, I purchased this car at a steal of a price, from a man that just needed the cash.
Any help is greatly appreciated. Thank you!
106324

Did you ever try reducing tire pressure? The one I took off our lot rode hard as well, too stiff for my spine and ass.
I lowered the tire pressure to 26.5 pounds. I then lowered it to 23 but feared I would damage a rim on the crappy Massachusetts secondary roads.
Back up to 26.5 pounds now. It acceptable but I don't feel comfortable in it.

GreyFox
12-05-15, 05:56 PM
Karsntrux, did you ever resolve the problem? I have a 2008 STS4 N* with the 1SG magnetic ride and its ride is rougher than any early 1970s Corvette I ever drove. It sounds like you have the same issues. I have tracked down replacement shocks from Amazon at a little more than a quarter of the price that the local dealer wants, but I am not convinced that the problem is with the shocks. I don't think I get a floaty ride or a lot of bouncing. It's just that when you hit a bump it's like there is no suspension whatsoever. BANG!

Interestingly enough, my wife drives a 2005 STS4 N* as well. Her ride is smooth as silk. I just went out to the garage, where both cars are parked, side by side. Just sitting there, the back end of her car sits a good inch or two higher than mine. To me, this does point a finger at the self leveling system (however both cars were not running, so there would have been no leveling activity on the part of either).

How do you test the self leveling system? And more importantly, if it isn't working, how do you determine which part of it has failed?

hiltonny
12-05-15, 06:44 PM
My 2008 AWD rides bad and the dealer told me it was a bad passenger rear shock which is the magnetic type, I ordered a new one for $331 from Rock Auto and plan to install it in a couple of weeks. I have a 2008 STS-V and that rides nice, they don't have the magnetic type suspension.

blackonblacklac00
12-05-15, 06:50 PM
Karsntrux, did you ever resolve the problem? I have a 2008 STS4 N* with the 1SG magnetic ride and its ride is rougher than any early 1970s Corvette I ever drove. It sounds like you have the same issues. I have tracked down replacement shocks from Amazon at a little more than a quarter of the price that the local dealer wants, but I am not convinced that the problem is with the shocks. I don't think I get a floaty ride or a lot of bouncing. It's just that when you hit a bump it's like there is no suspension whatsoever. BANG! Interestingly enough, my wife drives a 2005 STS4 N* as well. Her ride is smooth as silk. I just went out to the garage, where both cars are parked, side by side. Just sitting there, the back end of her car sits a good inch or two higher than mine. To me, this does point a finger at the self leveling system (however both cars were not running, so there would have been no leveling activity on the part of either). How do you test the self leveling system? And more importantly, if it isn't working, how do you determine which part of it has failed?

I just went through having to fix the back suspension on mine absorbers,springs,air lines,air compressor.

First test option is start the car and within 30 seconds or so you should hear the air compressor kick on for a couple seconds from the rear passenger side wheel well.

Second option open the trunk and have 2-3 people sit on the edge of the trunk and wait a couple seconds and listen for the compressor to kick on and the rear raise up.

If you don't hear the compressor turn on at all then make sure you check ALL fuses in the fuse box under the rear seats on the driver side. Check the labelling on the fuse box cover. There's a black relay, pink 30A fuse and a 10amp fuse. Let me know how this test goes and we will go from there.

GreyFox
12-06-15, 03:56 PM
Thanks blackonblacklac00. I tried your Test Option 1, and I did hear the compressor kick on for a few seconds. It sounded like it was under and in front of the rear bumper. So, what's the next step?

EChas3
12-06-15, 08:01 PM
Check the hoses or shocks, I'd guess.

blackonblacklac00
12-07-15, 07:32 AM
Like Echase3 said, check the shock. Once the compressor puts air in the bladder of the shock it should become firm. Might be a bit hard to reach with the tire on but try to get your hand on the shock air bladder and see if it's firm. If not squeeze the bladder with your had and listen if you hear air coming out of it.

Note one thing on my car that was wrong when I got it was the rear suspension was sagging like crazy. While I was waiting for the rear shock absorbers to come I installed the OEM spring brand new and that made the difference height all on its own. I wouldn't over look that either but I wouldn't be able to tell you how to determine if it's your springs because only reason I did mine were because it was obvious.

ddalder
12-08-15, 03:43 AM
The magnetic ride control shocks seem to be prone to completely seizing. This happened with my left rear and other members have reported this as well. Don't dismiss the fact that this might be a bad shock. My car rode like there was no suspension at all until I replaced the shock. It is extremely unlikely that a bad air ride system will cause such a harsh ride that it's described as the car having square wheels. Air is very compressible and there is definitely some flexibility to the wall of the bladder. These properties don't lend to the symptoms described.

http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/595065-rear-suspension-problem.html

GMJUNKIE
02-20-16, 09:26 PM
I'm having the same problem with my 2008 sts 4 very harsh ride,I just purchased the car from a dealer, I will be dropping it off Monday at the dealer to look at,it seems like the air shocks have to much PSI, I will post what they find

ddalder
02-20-16, 11:48 PM
I'm having the same problem with my 2008 sts 4 very harsh ride,I just purchased the car from a dealer, I will be dropping it off Monday at the dealer to look at,it seems like the air shocks have to much PSI, I will post what they find
It's extremely unlikely that there is too much air pressure in the rear shocks. I'm not sure that I've ever heard about anyone come to that determination. If you have the Magnetic Ride Control option (F55 and FE3 for 2008), the shock is likely defective.

Have a read through here...
http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/595065-rear-suspension-problem.html

Others have complained of the same issue. I'm not sure why this occurs but it isn't uncommon.

targetSTS
02-21-16, 06:42 AM
this version of mrc shocks is very unreliable. I talk about oem AC delco made by Chinese BWI. We have a lot of leaked shocks after just 5-10 k miles.
My new front shocks start leaking after about 35-40 k km. Ridiculous quality for 300$ per item.

GreyFox
05-05-16, 11:13 AM
Well, this last week I finally finished with the replacement of all 4 MRC shocks. What a difference. The car rides smooth like an STS should. It was well worth the investment.