Last post on Jul 01, 2013 at 5:50 PM
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Cadillac DTS, Automotive News, Sedan
#362 of 896 Weird Noise 2006 DTS III
Oct 01, 2006 (5:29 am)
We have been hearing a weird noise. It sounds as if it is coming from some part of the front of the car, at around 70 mph. There is no message being displayed. It is a buzzing sound and it comes and goes. I tried opening and closing the sun roof. This did not seem to make any difference.
We took the car in for service the other day. The master technician had not heard of the weird noise. I think I have fixed it. We have had the car up to around 75 several times since fixing the plastic. Raise the hood, there is a latch below on the vehicle. On both side of the latch there is plastic. This plastic is vibrating at higher speeds causing the sound. I used silicone sealer under the leading edge of this plastic to glue it down. If this plastic ever needs to be removed it should come off without too much of a problem. Apparently this plastic is not loose on all of these vehicles, not everyone is hearing this noise.
The noise in the trunk:
I have seen several complaints on another forum, these vehicles have a vacuum pump in the trunk. If the intake vacuum in the engine becomes low this pump will run to bring vacuum to a proper amount. If the pump is running excessively you could have a vacuum leak. It is common to hear this pump right after you start the engine and it is at idle, also if you stop with the transmission in gear and the engine running at idle. If this pump is loose it could be radiating the noise, it is a small vacuum pump.
Still no fix for the acceleration problem, see 2006 Cadillac DTS downhill inadvertent acceleration problem.
#363 of 896 Re: Future DTS [dispencer1]
Oct 01, 2006 (8:56 am)
While the 2006 DTS looks much like the 2005, it really is an all new body, and the wheelbase is longer.
#364 of 896 Re: Future DTS [dispencer1]
Oct 01, 2006 (8:44 pm)
The only visual similarity between the 00-05 and the 06 bodies are the doors. Otherwise the front, rear, wheels, and interior are all new. Mechanically they are virtually the same (4.6 Northstar, 4 spd tranny). As far as the dimentions go, the wheelbase, length, and width are all within 1/4 of an inch to the previous gen. That part is pretty much the same.
#365 of 896 Re: Weird Noise 2006 DTS III [wpsr]
Oct 02, 2006 (6:02 am)
Hi - in your post you mentioned that you also belong to another forum. What is it - I would like to sign up for it also. Like to keep abreast of what is going on with the DST.
#367 of 896 Re: Future DTS [volvodan1]
Oct 03, 2006 (6:13 pm)
Thanks to everybody who responded. I'll get a 2007 in 2008 and will look for a Luxury II or III -a lease return and not a rental car if I can avoid it. My "Certified" base 2003 Deville I purchased in January 2004 has been absolutely dependable except for some wind noise from the vertical post on the right rear door. It now has a little more than 50k miles on it. The dealer replaced a major part of the door and it solved the problem. I rented a new Avalon last month for an extended trip within Florida. Lots of road and wind noise. Luxurious interior, lots of pickup, felt a lot faster than my Deville, and obviously well put together. Unfortunately it is really a mid sized car. Luggage space is much less than the Deville and the center console is huge with a silly door over the radio. The radio itself is outstanding -better than my Deville but the new DTS will have the Bose audio system which probably will improve things a bit. CU loves the Avalon and calls it full size but it still feels to me like a much smaller car than the Cadillac. When you drive a Deville or DTS it just feels like a heavy car which is what it is supposed to feel like. A new body in 2011 or 2012 will be great -just in time for me to trade in my 2007 that will still be under warranty.
#368 of 896 Re: foot off gas and rpms don't drop. car keeps going [wpsr]
Oct 04, 2006 (5:33 am)
wprs – I have an idea that may help you with your surging problem. You may have already tried this but here it is.
Go to the senior service rep at your dealer and have them loan you a car identical to yours. By identical I mean, in your case, a Luxury I, II, or III and also the same model year. I believe your post indicated that you have the 2006 Luxury III. The Performance version has a different engine and MAY not experience the same problem. I have the performance and have not noticed a surge yet.
Drive the same route that you do when you most notice the surge - like when you turn into your driveway.
1 – If the loaner displays the same surge then it may well be across the board.
2 – If the loaner does not surge then you have more fuel for the fire to fight GM.
In the second case it would be great if the service rep were with you.
Good luck. – fmoeller
#369 of 896 Re:2006 Cadillac DTS III downhill acceleration problem [fmoeller]
Oct 04, 2006 (5:03 pm)
That is a good idea, I have been thinking the same thing. Keep in mind, you must go down a grade that is steep enough for the car to push the engine. It is easiest to reproduce in 1st or 2nd gear. This is when the computer shuts off the gas. As soon as the engine gets to about 1000 rpms and the gas comes back on is when we get the surge of 600 to 700 rpms. The dealer's head technician here has reproduced the problem with our car and others on their lot, including a Buick with the same engine as the Cad. The problem is the dealer and Cadillac say this is normal, yes really hard to believe. We have contacted Cadillac direct and also NTSB. I think NTSB is on overload.
It will be a little while before I will have a chance to drive another car at the dealer. Thanks, wpsr
#370 of 896 RE: surging problem
Oct 05, 2006 (8:37 am)
I did suggest that this might be related to fuel quality. My question for wpsr and buckeyedad is: are you using premium or regular? and is it a name brand or generic (like walmart).
#371 of 896 RE: surging problem [sls002]
Oct 05, 2006 (11:15 am)
I have tried different brands and grades, no difference. Thanks, wpsr