: New problems, anybody have these?



Xaqtly
05-11-12, 11:32 AM
I can't catch a break, apparently. So before I take the V in for its monthly dealer visit to fix it, I wanted to see if anybody else had experienced these things.

1. Today there's a new sound coming from the passenger side, on the outside of the car, I can't tell if it's near the front or rear wheel, or somewhere in between. It sounds a little like a card in bicycle spokes, but heavier and more metallic. It's speed-dependent, it doesn't start until about 25 MPH, and then the oscillation gets quicker and slows down with vehicle speed. It's pretty loud, I can hear it very clearly inside the car with the windows up.

It was definitely not there yesterday. I checked the wheels and lug nuts, none of them seemed loose, and I couldn't find anything that looked out of place. I'm at a loss, I can't even imagine what it could be at this point.

2. There is a high pitched whining, also pretty loud, that sounds like it's coming from the driver's side rear axle, or somewhere near there. It's only present from 45-60 MPH or so. It's speed but also throttle-input dependent. If my foot isn't on the gas pedal then it doesn't make the noise. But if I have even the slightest pressure on the pedal, the noise comes in at a volume relative to how far I have the pedal pushed down - but only between about 45 and 60 MPH. I can make the noise fade in and out by giving it gas and then getting off the pedal.

3. There is an ever-present but very quiet metal on metal grinding sound coming from the passenger side rear axle or near there. It's so quiet that it almost sounds like a normal mechanical driveline noise, but it still sounds like metal on metal to me. That could be perfectly normal, I have no idea. It's just something I noticed.

smackdownCTSV
05-11-12, 11:42 AM
Supercharger rattle, wheel click, and diff?

DangFoo
05-11-12, 11:47 AM
Sounds like the notorious "wheel click" issue coupled with something at the rear differential. I have the same noise as you described in #3 and I'm probably going to just make that Service appointment and have the diff fluid level checked and/or replaced.

Trapspeed
05-11-12, 12:05 PM
I'll take "Wheel Click and low differential fluid" for $500., Alex. For what it's worth, the wheel click is now married to you. No end in sight, I'm afraid. The diff issue is an easy fix.

Xaqtly
05-11-12, 12:14 PM
It depends - I've had the front wheel click issue before, and this ain't it. The "normal" wheel click issue is only present while turning the wheels, and only at low speed. The current issue I have is only present at high speed, and it does it without turning the wheels. Is this a second type of known wheel click? Or maybe it is supercharger rattle. Does the s/c rattle occur if you're not in positive boost? I'm hearing it even when my foot is off the pedal completely and I'm coasting.

The high pitched whining I described is definitely coming from the rear of the car, not the front, so I ruled the supercharger out as a possible cause of that particular problem. The grinding seems like a diff issue to me too. Well either way looks like I'm going to have to bring the car in again.

JFJr
05-11-12, 12:23 PM
Also, there could be something loose underneath your car or some road debris flapping against the underside. I heard something like this from a relatively new standard CTS loaner. My wheel clicking was fixed about 52,000 miles ago and I never heard it outside a parking lot.

Could the grinding be a brake pad wear sensor? You might check the proximity of the sensor to the rotor.

Jud

Griffin337
05-11-12, 12:31 PM
2. There is a high pitched whining, also pretty loud, that sounds like it's coming from the driver's side rear axle, or somewhere near there. It's only present from 45-60 MPH or so. It's speed but also throttle-input dependent. If my foot isn't on the gas pedal then it doesn't make the noise. But if I have even the slightest pressure on the pedal, the noise comes in at a volume relative to how far I have the pedal pushed down - but only between about 45 and 60 MPH. I can make the noise fade in and out by giving it gas and then getting off the pedal.

I just picked my car up yesterday after what you described above to the T. They replaced the Diff.

I also had the same metal on metal sound you describe above in #3 but from the drivers side. I haven't been able to drive enough to figure out if the diff replacement also cured that problem as well.

If I can just get them to do something about my damn recaro I would be ok for now..

FLTRI
05-11-12, 01:24 PM
I've got a slight supercharger rattle at idle, but it's very minor and goes away at 800 rpm and above. There was a thread on here several months ago describing the "Spokes in a bicycle wheel" sound. IIRC, he was several quarts low on oil, I think???

No rear end whine on mine, but sounds like low fluid/bad diff to me too, in reading the many posts here describing the sound. I'll bet the metallic grinding sound is related to the differential as well, but I'm admittedly just guessing...

Edit: Here's the link to the other thread I mentioned. There's a YouTube video with the sound to compare. This guy, had to have the engine replaced, hope your's turns out better. Link: http://www.cadillacforums.com/forums/2009-cadillac-cts-v-general-discussion/246308-engine-noise.html

Cadillac Cust Svc
05-11-12, 01:28 PM
Xaqtly,
It sounds as though you've made quite a few visits to your dealership for different concerns - I'm sorry if this is the case. If we can ever look into anything further, please don't hesitate to get in touch with us here on the forum. Otherwise, we look forward to hearing how your visit goes.

All the best,
Sarah (Assisting Katie)
Cadillac Customer Service

Xaqtly
05-11-12, 02:41 PM
Here's the link to the other thread I mentioned. There's a YouTube video with the sound to compare. This guy, had to have the engine replaced, hope your's turns out better. Link: http://www.cadillacforums.com/forums/2009-cadillac-cts-v-general-discussion/246308-engine-noise.html

I'm real familiar with low oil sounds coming from an engine (don't ask), and that was one of my initial thoughts at first too, but I checked my oil the other day and it came up at about half full on the dipstick but it was cold, had been off for 12 hours. So I wasn't worried about the level. And the other thing is that this noise is speed-dependent, not RPM-dependent. Like I can be going 50 MPH, and push the clutch in so the engine is idling and the noise doesn't change. It's also coming from the right side of the car, as opposed to the middle front. As far as I can determine, there's nothing wrong with the engine, thankfully.

I had the dealer check the fluid in the rear diff the first time I was there, and it was full so I hadn't been worrying about it. At this point I'm pretty convinced that both the grinding and the whining noise coming from the rear is the diff, but I still have no idea what the clicking noise is from the right side. I mean it could be wheel clicking, I just can't find anything wrong when it's not moving. And it's not clicking when at low speed and turning, which is when that usually shows up. This is also much louder than the normal wheel clicking, at around 75 MPH it's so loud that it sets up a resonance through the frame. I can actually feel it through my seat. Very weird.

Anyway I just got back from dropping it off. I told my service advisor I was back for my monthly visit, he didn't seem amused. At this point I'm just betting on the law of averages, and assuming that since so many things have gone wrong with this car and been repaired or replaced that things can't continue to keep going wrong. Eventually it's going to hit its stride and be fine. I did tell my advisor that it seemed like a Friday car.

I'll post back when I hear from the dealer.

FLTRI
05-11-12, 03:34 PM
Good news that it's not low oil, that is never a good thing. Sounds like it has to be somewhere between the trans output shaft and the wheels, if it's speed, and not RPM dependent. Also a good thing, IMHO.

I've never had the wheel click, so I don't know what it sounds like. I listen pretty intently when backing, and/or turning at full lock, and it's silent so far. I did a preemptive strike when I took delivery though. I loosened and then retorqued all the lug nuts to 140 ft/lbs. All felt pretty loose when I backed them off. 140 is recommended, 158 is the TSB if you get a click. Figured that left me another re-torque if they started clicking. So far, so good...

Best of luck with the service, looking forward to seeing what they come up with. I hope this is the last time you see them, until your'e due for an oil change too...

DangFoo
05-11-12, 05:17 PM
Please keep us posted on the prognosis and repair(s).

Xaqtly
05-11-12, 06:08 PM
Good news that it's not low oil, that is never a good thing. Sounds like it has to be somewhere between the trans output shaft and the wheels, if it's speed, and not RPM dependent. Also a good thing, IMHO.

Yeah, absolutely. I'm real sensitive to even the slightest of ticking noises from the engine, but the only one I can hear is the normal LS3/9/A idle sound. Perfectly good as far as I can tell. My GF's vette sounds exactly the same, just louder.


I've never had the wheel click, so I don't know what it sounds like. I listen pretty intently when backing, and/or turning at full lock, and it's silent so far.

Yeah you'd definitely hear it if you had it. It's sort of a metallic click sound that happens maybe once every quarter wheel rotation or so while moving and with the wheel at full lock. It's not loud, but you can definitely hear it with the window down.


Please keep us posted on the prognosis and repair(s).

Will do.

Xaqtly
05-14-12, 08:18 PM
Got a call from Service, they said they can't replicate any of the problems I brought it in for. So I drove back there, took the assigned mechanic for a drive in it, and sure enough I couldn't hear it making the noise any more. Murphy's freaking law. But wait! As we drove past a wall, I could hear a clicking sound bouncing off the wall, though it was kind of quiet. So we drove past a couple more walls, and it became clear that it was still making the noise, just much quieter for some reason. The mechanic is suspecting the wheels or something about the wheels, or something.

Anyway they're going to look at it some more. I couldn't get it to replicate the rear whining, so whatever. If it really is the diff, then the whining will get worse, and when it does I can bring it back. I'm not going to force them to fix a problem I can't demonstrate. Maybe this will be an easier/quicker fix than I'd hoped.

Cadillac Cust Svc
05-15-12, 10:27 AM
Thanks very much for the update, Xaqtly. I'm very relieved to hear that you and your mechanic were able to cleverly duplicate the noise!

Hoping for a speedy fix,

Katie
Cadillac Customer Service

Xaqtly
05-15-12, 06:11 PM
So after they took the rear wheels off again and poked around the driveshaft (which had been replaced at an earlier dealer visit), they discovered a loose heat shield. Apparently the noise I was hearing was the heat shield vibrating against the driveshaft. Obviously that was an easy fix, they just bolted it back up. As to the other noises, they said they couldn't reproduce them, and I didn't bother trying to reproduce them. If the problem is the rear diff, it will get louder and make noise more consistently, and that's when I'll bring it back again.

For now it seems fine, I couldn't hear any noises when I picked it up, so I'm going to leave it at that. My service rep told me that the heat shield thing happens every once in a while, but I'm pretty sure that's BS. I've never heard of it happening to any CTS-V owners. Since it was right next to the driveshaft, I'm assuming they either didn't fully tighten the heat shield or forgot a bolt or something when they replaced the driveshaft a couple months ago, and didn't want to cop to making a mistake.

It's not a big deal, obviously no harm done and it's an easy fix, but it does sound like they're trying to make it look like a common problem, which it's really not. Regardless, I have my car back now, which is what counts. And it's not making noises, so I'm happy.

tbauer
05-15-12, 06:42 PM
I had the same two problems. I had my drive shaft replaced about a month ago under warranty. It was slinging grease all over the heat shield close to the diff. Shortly after I got it back my tuner noticed the heat shield was loose and vibrating he messed with it a little and its been good since.

On a side note before we did any work to the car I had several items replaced all under warranty (all leaking).
Both axles, driveshaft, two shocks, oil pan gasket, oil pan plug, & power steering hose!

rjoffe
05-15-12, 06:46 PM
On a side note before we did any work to the car I had several items replaced all under warranty (all leaking).
Both axles, driveshaft, two shocks, oil pan gasket, oil pan plug, & power steering hose!

You take it off road ?

That's allot of leaks to repair

tbauer
05-16-12, 04:47 AM
You take it off road ?

That's allot of leaks to repair

Either that or it was used as a tow vehicle! Its also had the supercharger replaced, severel trim items replaced, the passenger seat internals replaced, and while it was there one of the techs hit another car (front bumper and drivers fender damaged). All from a CPO car purchased in Dec. 2011

Trapspeed
05-16-12, 07:25 AM
Curious, guys. What was the driveshaft replaced for? What was happening?

Cadillac Cust Svc
05-16-12, 08:36 AM
So after they took the rear wheels off again and poked around the driveshaft (which had been replaced at an earlier dealer visit), they discovered a loose heat shield. Apparently the noise I was hearing was the heat shield vibrating against the driveshaft. Obviously that was an easy fix, they just bolted it back up. As to the other noises, they said they couldn't reproduce them, and I didn't bother trying to reproduce them. If the problem is the rear diff, it will get louder and make noise more consistently, and that's when I'll bring it back again.

For now it seems fine, I couldn't hear any noises when I picked it up, so I'm going to leave it at that. My service rep told me that the heat shield thing happens every once in a while, but I'm pretty sure that's BS. I've never heard of it happening to any CTS-V owners. Since it was right next to the driveshaft, I'm assuming they either didn't fully tighten the heat shield or forgot a bolt or something when they replaced the driveshaft a couple months ago, and didn't want to cop to making a mistake.

It's not a big deal, obviously no harm done and it's an easy fix, but it does sound like they're trying to make it look like a common problem, which it's really not. Regardless, I have my car back now, which is what counts. And it's not making noises, so I'm happy.

I really appreciate the update and feedback, Xaqtly. Please let us know if anything changes, and I'm glad you're enjoying your V again!

Katie
Cadillac Customer Service

FLTRI
05-16-12, 11:54 AM
Good news, Xaqtly. Hopefully all the bugs are worked out now, and you can continue to enjoy the Vagon!

Xaqtly
05-16-12, 12:03 PM
Curious, guys. What was the driveshaft replaced for? What was happening?

In my case, it was my first visit to this dealer and I had just gotten the car a week prior, so they were looking the rear end over as one of the symptoms was that I had gotten a check engine and rear end warning. They said they found that the driveshaft was "out of balance" so they replaced it.

tbauer
05-16-12, 08:33 PM
Curious, guys. What was the driveshaft replaced for? What was happening?
92098
This was mine. Slinging grease all over the heat shield and exhaust. I was told it was some kind of seal leaking and the fix was to replace to driveshaft. Whatever its fixed now!

Trapspeed
05-16-12, 09:43 PM
Thanks for the feedback guys. Appreciate it. Something else for me to keep an eye on. I'll tell you though...just passed 40K and this thing is pretty tight. I can live with the little annoyances for a mechanically sound car overall.

firepwr
05-27-12, 08:54 PM
Late to the party, but I had a similar ticking coming from the drivetrain(not related to wheel rotation, but speed sensitive, so trans/drive shaft/diff) and I thought it was related to the new diff that was replaced. Was on and off, and the techs couldn't replicate it (of course). They ended up identifying a service bulletin for the trans propellor shaft that required loctite and a day of set time. Just picked it up today, but fingers crossed.

stogieman
01-03-13, 03:20 PM
You know what a lot of you guys should do,, ruin your hearing by listening to loud rock music or some other venue and then like me you won't hear all these rattles ..


Jerry in Minnesota.