: Clunking When Accelerating From Stop



kristine
11-19-10, 04:01 PM
I have a 2005 STS AWD with the V8. We have been having an issue with a clunking when 'punching' it from a stop (it sounds like it's to the right and a little to the front from driver's seat). At first, you had to give it quite a bit of gas, but it is getting progressively worse and it doesn't take so much anymore. (If you ease into acceleration though, it doesn't make the noise.) The car is at the dealership to get something else fixed and they are saying the transfer case needs to be replaced. Anyone else with this issue? What did you do to fix it? We did have a bad motor mount fixed and that was not the issue. Thanks!

TobyJohnson11
11-19-10, 09:47 PM
If its under warranty let them replace the T-Case and then troubleshoot from there. I replaced the T-Case in my AWD escalade but it was making a whining noise, not a clunking noise. Good Luck.

kristine
12-16-10, 04:43 PM
I wish it were under warranty - it has over 132k miles and has been out of extended warranty for a year now. Just wondering if others had the same problem before we pay the money to get it done.

caddyfat2
12-16-10, 05:29 PM
I have a 2005 STS AWD with the V8. We have been having an issue with a clunking when 'punching' it from a stop (it sounds like it's to the right and a little to the front from driver's seat). At first, you had to give it quite a bit of gas, but it is getting progressively worse and it doesn't take so much anymore. (If you ease into acceleration though, it doesn't make the noise.) The car is at the dealership to get something else fixed and they are saying the transfer case needs to be replaced. Anyone else with this issue? What did you do to fix it? We did have a bad motor mount fixed and that was not the issue. Thanks!
I have an 05 AWD 1SG and I have the same problems. My STS has been very problematic since I purchased it 3 years ago. Last week I had my motor mount replaced along with my CATS and now they tell me that my transfer case is bad also. I thought it was my aggressive design tires but it wasn't. It was the transfer case which I will have repaired come January. The dealer told me that they will have my car a week for the job. I love the style of the new Caddys but I really think this will be my last one due to mines being very unreliable.My STS has been back to the dealer 24 times since I have owned it.Here is what I had done. (just a short list)
Ignition sw replaced,x-mission reprogram,drivers seatbelt replaced, intsrument center panel replaced,right headlamp composite replaced, steering gear (rack ) replaced,front left side impact inflator replaced, clockspring replaced,radiator replaced , shifter replaced,left headlamp composite replaced, alternator replaced,battery replaced 2x,cat convertor replaced, motor mount replaced, ashtray replaced and now I have to have the transfer case done the first of the new year.OH yeah MERRY CHRISTMAS an good luck with yours...!

PS
On cold morning (below 45 deg F )before my car warms up it sounds like a 90 year old man making all sorts of growls , grunts and growns and all this with only 65K on the clock.

KRSTS
12-16-10, 06:48 PM
You need to decide if a six year old car with that high a mileage is worth putting the kind of money your talking about into the repairs. As it is now you can probably get about $6k - $8K for it.

AllGoNShow
12-17-10, 06:29 PM
Just had one of my clunks fixed, do you get a clunk when shifting from park into reverse or drive? If so get them to check your differential case bushing, mine was "missing" not sure how that happens but when I went underneath on the hoist, there was definitely no bushing in there. Not sure where it was ordered from, I am assuming possible an AC Delco item or maybe a dealer item but i cannot find in the online catalog's, 6758676567

EChas3
12-17-10, 10:39 PM
I continue to be surprised at the repair history reports on these cars. My wife and I have driven more than 70,000 miles for almost 5 yesrs when you combine the use of our cars. We have both had some issues, my AWD 1SG more than her RWD 1SE ex-Hertz. Neither car has had the kind of trouble that suggests 'lemon'.

'Car guys' all know some cars are built better than others and many are mistreated by owners (or lessors). Obviously higher mileage cars have a larger risk of expensive repairs. In another few years, we will likely buy high-mileage extended warrenties or trade cars. I think any other choice defies common sense.

IMHO, if you don't want to pay for an extended warranty, don't buy a STS. There are a few that don't need attention but most do. I love all the bells and whistles but the toys break; so do the basics. I will offer a heart-felt exemption to those that claim: "If I can't fix it, it ain't broke."

Everyone else needs a warranty, service agreement, insurance policy, etc.

HASIII
01-11-11, 01:17 PM
I also have a transfer case problem, it started the clunking problem in september 2008 while under warranty. I took it to dealer who informed me they didn't notice any problem. Now they tell me the transfer case chain is jumping the sprocket and needs to be replaced at a cost of $2,300.00 after the car is out of warranty of course. They claim the transfer case had almost no fluid, and insinuated that I must have drained the fluid out of it which caused the damage. They claim this must be the case as there is no visible fluid leak. Any one else heard of low fluid without a leak? I have been told by outside transmission specialists that their is an internal seal which prevents transmission fluid from entering the transfer case and that if it fails it is possible for the transfer fluid to flow out and into the transmission case????????

KRSTS
01-11-11, 02:58 PM
Talk to the zone manger. If it was identified prior to expiration of the warranty, it is covered. Hope that the dealer recorded it and that you have the work order?:crying2: