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........
Trending Topics
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?
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Six Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
Is This Convertible Cayenne A Steal, Or A Returnless Investment?
Verdad Gallardo
10 Best Non-Flat Six Porsches You Can Buy For Under $100K
Joe Kucinski
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
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).
