Thud when accelerating
Thread Starter
Cruisin'
Joined: Dec 2011
Posts: 9
Likes: 1
Thud when accelerating
Hi, I dont know if this is normal. Have a 2008 cayenne v6 with 26t KM (A/T trans) on the clock. I notice that on low speeds when i press down on the gas there is s thudding sound which seems to come somewhere from the driveshaft. It is not bothersome but sometimes when my foot is heavy I feel the thud. The car has low milage so I dont know if some support parts have worn down or is this normal for this car. Thanks in advance.
Pro
Joined: Feb 2009
Posts: 685
Likes: 16
From: Australia
Certainly sounds like the classic cardan shaft issue one reads about, although 28,000 km is unusually low mileage for a worn cardan shaft centre bearing support.
They usually start banging at circa 100,000 km.
They usually start banging at circa 100,000 km.
Burning Brakes
Joined: Oct 2009
Posts: 945
Likes: 15
From: AUSTIN.....SoCo for those who know
if its the center bearing on the cardan shaft go see other posts but the rubber breaks apart around the bearing.
If it's a thud at shift between gears(up and down) its a tranny issue........
If it's a thud at shift between gears(up and down) its a tranny issue........
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Thread Starter
Cruisin'
Joined: Dec 2011
Posts: 9
Likes: 1
Right not based on searches I thing it is not a tranny issue since there is no thud on shifts. Here was something I noticed though, I had an alignment and camber adjustment and it temporarily went away. That mad me think of control arm bushings, though it is only a hunch. Ill try shaking some parts of the underside of the car and see it there is any play. And yes, I have some vibrations at high speeds (120Km/h). I just had my tires balanced twice. No abnormal sound though when speeding. Is there a specific symptom for the center bearing going out?
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Rennlist Member
Joined: Aug 2009
Posts: 724
Likes: 3
From: El Dorado Hills, CA
Cardan Shaft/Center Bearing = midgets banging through the center console... 20 or 30/second. Almost like a violent flat tire.
Transmission "clunk" feels like someone hit you... usually when you accelerate hard. Remedy is probably Valve Body replacement and/or Transmission Control Unit.
Transmission "clunk" feels like someone hit you... usually when you accelerate hard. Remedy is probably Valve Body replacement and/or Transmission Control Unit.
Pro
Joined: Mar 2006
Posts: 535
Likes: 2
From: Lawn Guyland
if its not the cardan shaft bushing, check the rear control arm bushings. when they rip they make a noise when susp changes direction, like accel after reversing. will be a single clunk per direction change.
Thread Starter
Cruisin'
Joined: Dec 2011
Posts: 9
Likes: 1
if its not the cardan shaft bushing, check the rear control arm bushings. when they rip they make a noise when susp changes direction, like accel after reversing. will be a single clunk per direction change.
Rennlist Member
Joined: Feb 2012
Posts: 2,292
Likes: 7
From: Oahu, HI
I have this clunk/thump when first starting or changing direction from forward-->reverse (and vice versa). I have just replaced the drive shaft. How do I check the bushings. Is it possible to visually inspect bushings in the control arms? I dont have a lift or jack anymore since I moved into a townhouse (had to get rid of a bunch of tools unfortunately).
