: Thunk from front end when hitting bumps in the road and shifting hard-- motor mounts?



HAMSTAR
05-09-12, 02:32 PM
Still getting to know my new 06 CTS-V. Put in the CS diff bushing and UUC shifter last week, which made the car ride and feel MUCH tighter. However, I'm now beginning to notice noises that I didn't notice before, or that I did notice, but attributed to the wrong cause.

Anyway, I do have a thunk that comes from the drivetrain, even after the CS bushing and UUC shifter. I think this may be the dual-mass flywheel. It only happens when I drive it because I clutch-dump like I stole the car (blame years high-revving imports and dreading letting the tach drop).

Today, noticed a NEW thunk from the engine. When I hit a bump or big crack in the road-- thunk. Is that the dreaded motor mounts? I thought it would only be a matter of time, given I live in Baltimore, but three weeks?

What do you guys think?

HAM

CTSV_510
05-09-12, 03:51 PM
Your three big remaining areas to address to rid the clunk are (1) motor mounts (2) flywheel and (3) possibly trans mount. It is also possible the rubber coupling of the two piece driveshaft is contributing but the three I listed are the main ones.

You really can't be clutch dumping in this car or your next thread will be..."Newbie...please walk me through differential replacement options..."

Cadillac Cust Svc
05-09-12, 04:10 PM
HAMSTAR, I can see you prefer a Do-It-Yourself approach and I can appreciate that. If you still haven't found a fix after your attempts, I would recommend visiting your Cadillac dealership for a thorough diagnosis.

Glad to see the community is already responding with helpful feedback!

Katie
Cadillac Customer Service

Juggernaut850
05-09-12, 07:53 PM
May also be sway bar bushings or end links. They would tend to make noise when the bump is isolated to one wheel or the other, less so when both wheels contact a bump at the same time like a driveway or such.

HAMSTAR
05-09-12, 09:12 PM
May also be sway bar bushings or end links. They would tend to make noise when the bump is isolated to one wheel or the other, less so when both wheels contact a bump at the same time like a driveway or such.

Good idea. I will look out for that.

----------


HAMSTAR, I can see you prefer a Do-It-Yourself approach and I can appreciate that. If you still haven't found a fix after your attempts, I would recommend visiting your Cadillac dealership for a thorough diagnosis.

Glad to see the community is already responding with helpful feedback!

Katie
Cadillac Customer Service

Hi Katie, from what I can see, virtually every one of these Vs encounters the following problems: rear diff bushing, sloppy shifting, motor mounts, diff failure and chronic wheel hop almost from when the cars roll off the lot. I would think people would take Cadillac more seriously if they had done something about it when the cars were in production, rather than building them from 2004 to 2007 with only minor modifications that didn't address the problems in a material way.

FuzzyLogic
05-09-12, 09:50 PM
As far as I'm concerned, Katie should be banned from the forum for spamming and potentially misleading users about Cadillac's willingness to address the issues that we have to deal with ourselves. I assume that it's done out of ignorance, but if not, it's malicious. Either way, it needs to be stopped.

HAMSTAR
05-09-12, 10:07 PM
As far as I'm concerned, Katie should be banned from the forum for spamming and potentially misleading users about Cadillac's willingness to address the issues that we have to deal with ourselves. I assume that it's done out of ignorance, but if not, it's malicious. Either way, it needs to be stopped.

Aw, I don't think it's that bad. She probably on the social media team, got a bunch of browsers open to a bunch of different forums, writing the same thing over and over and over again. Doing her job.

garrettg
05-09-12, 11:05 PM
The engine, trans and brakes is the only thing that sold these cars. Suckered me right in... If you really drive your car and you are not a serious diy forget it buy a bmw. The implementation of rubber bushings and mounts on the V1 is pathetic. Most of these mounts are shot before the run flats are worn out. Luckily have aftermarket companies to make parts to address these issues. Once addressed the car is amazing, I often wonder if any gm engineer has had the chance to drive a sorted V1 where the car is actually smooth at 5k in 1st gear and you can actually feel a positive shift to 2nd without feeling like the car is puking on itself. Its taken me 2.5 years to sort most of it out, had I bought an m3 it would have been sorted day 1. I like my V, but out of the box its a fail for every purpose it was designed for except scaring people with its combination of power, lack of overall control and non-existent feedback...

rand49er
05-09-12, 11:23 PM
If you want a BMW, go buy one. Then, spend your time on their forum complaining about other problems including a perpetual money shortage and leave us alone.

As far as the MMs go, a rough engine shutdown is a sure sign that you need new MMs. If that's the case, you have several options.

thebigjimsho
05-09-12, 11:27 PM
Zing!

garrettg
05-09-12, 11:44 PM
Haha my v is sorted now no way I would consider another sedan. Lucky better parts are reasonable. Its not as simple as mm imo. I will re-iterate once sorted its an incredible amazing sedan. Carry on, done with complaints I am happy and would do it over again.

mstrjon32
05-10-12, 03:39 AM
The engine, trans and brakes is the only thing that sold these cars. Suckered me right in... If you really drive your car and you are not a serious diy forget it buy a bmw.

I would disagree on two accounts: First, one major thing that sold them was the style. Second, BMW is NOT god's gift to reliability or performance. I've run with some quick BMW's and we had to pull off so their brakes could cool. And, If I had to pick between owning the V or owning an M-car after the warranty was up, I would choose the V any day of the week. The V is high-performance car that your drunken shade tree mechanic can easily work on without special tools or proprietary computers for *every single job*.



I would think people would take Cadillac more seriously if they had done something about it when the cars were in production, rather than building them from 2004 to 2007 with only minor modifications that didn't address the problems in a material way.

This must be your first GM product. For the most part, I love GM cars, but they are notorious for screwing up some small detail, sometimes even corporately acknowledging that it's screwed up, and then going on for years and years making it the same defective way...


In other news, I've also got a front-end clunk. I thought it was the struts (I wanted to upgrade to FG2's anyway) so I replaced them and still have it. Next up is replacement of the sway bar bushings and end-links.

garrettg
05-10-12, 12:11 PM
I would disagree on two accounts: First, one major thing that sold them was the style. Second, BMW is NOT god's gift to reliability or performance. I've run with some quick BMW's and we had to pull off so their brakes could cool. And, If I had to pick between owning the V or owning an M-car after the warranty was up, I would choose the V any day of the week. The V is high-performance car that your drunken shade tree mechanic can easily work on without special tools or proprietary computers for *every single job*.




This must be your first GM product. For the most part, I love GM cars, but they are notorious for screwing up some small detail, sometimes even corporately acknowledging that it's screwed up, and then going on for years and years making it the same defective way...


In other news, I've also got a front-end clunk. I thought it was the struts (I wanted to upgrade to FG2's anyway) so I replaced them and still have it. Next up is replacement of the sway bar bushings and end-links.

We will have to disagree about what sold the car, the styling/interior was just ok(have you had your bumper melt around the headlights on a hot summer day?, does your high 3rd brake light still work?) it was all about rwd sedan, 400 reliable hp, manual, brembos, and all that for <2 tons. And yes I cross shopped several bmw variations and went with the V due to maint costs. So you are exactly right on the warranty part but back to the original post in that I didn't think it would need this much sorting to be a controllable, comfortable beast and by sorting I don't mean replacing stock parts with stock parts under warranty or otherwise. Cadillac service for the record has been great, no complaints, new trans(after rebuilding the original one started making noise) and diff(3rd gen replaced with 4th gen after lots of noise) installed right at the end of the 5 year powertrain. I don't drag race, I don't drop the clutch, I drive the car from point a to point b sometimes spirited. The point is in stock trim the car needs some help. Its more time than money and as already posted I would sort another one in the future.

lollygagger8
05-10-12, 01:37 PM
I bought the car 50% on the exterior (I will poke you in the eye with a hot soldering iron if you don't agree that the V1 looks better than V2) and 50% powertrain.

Yes the Nav f'n blows, all the mounts suck, the diff sucks, the sail panels are stupid, the Bose system blows, etc, etc.

BUT, I've replaced 90% of that $hit with something better and I still love my V1.










Soldering iron standing by......

FoD
05-10-12, 02:28 PM
1000% agree with the styling of the V1 vs. the V2. The Nav does suck but it doesn't bother me as I have other means. The stereo sucks but doesn't bother me cause I would rather listen to the roar of my LS at 5000 RPM. My third brake light works just fine. The only thing I've had to replace is the wiper motor. I have the 2006 Diff (under warranty).

garrettg
05-10-12, 04:35 PM
Ya V1 looks better than V2. The V1 gauge cluster is the ideal setup with the digital speed and twin large analog gauges, the rest of the interior under values the car except for the inside door handles. I actually don't mind the nav system except the odd choice in system limitations when driving. The nav clock setting not sticking(whats the point if you have to manually set it anyway) and lack of ability to use the car's built in voice command system are hard to understand. Also it's obvious the nav was suppose to be touch screen(like other gm cars of that era) and got flipped to buttons at the 11th hour. When I got my V the DIC was programmed for non V and I could use the voice commands with a steering wheel button so all the hardware is there just no button to use it when its programmed for a V. Most of this makes me laugh but like someone said earlier they could have easily fixed all this and previous mentioned issues by the 05 model year if they wanted to make the "new standard of the world" a few years earlier.

thebigjimsho
05-12-12, 03:11 PM
You people are crazy...

Faber
05-13-12, 02:23 AM
Someone call the cops, this thread got jacked...

D3l7a3ch0
05-15-12, 01:42 AM
The V is high-performance car that your drunken shade tree mechanic can easily work on

I resent that