Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists

untraceable noise.

 
Old 10-11-2010, 02:22 AM
  #1  
littlebobby
User
Thread Starter
 
Join Date: Jan 2010
Posts: 37
Default untraceable noise.

hey guys I seem to have an odd problem with my 83' 928s. When i start the car i hear a noise that can only be described as a rattleing loose heat sheild. almost like if you were to take a shovel and scrape it along a driveway but it increases and decreases in intensity. It persists if the car is at idle however if you select drive or reverse it dissapears. Also while driving its not there. When the car is turned off the noise kind of farts real quick. Its very hard to describe, if i knew how to post a video i would.

Now I have checked underneeth the car while it is runing and I cannot for the life of me find out where its scource is. There are no lose heat sheilds from the front of the car, nothing on the exhaust that i can see. it almost sounds like it is coming from the oil pan.

Does anyone have any information that can be of help. i know its very vague but its all io really have to go on for now. Anything at all would be greatly appreaciated.
littlebobby is offline  
Old 10-11-2010, 02:36 AM
  #2  
Randy V
Addict
Rennlist Member
 
Randy V's Avatar
 
Join Date: Jun 2000
Location: Insane Diego, California
Posts: 40,067
Default

Sounds like a bad torque tube and/or torque converter bearing
Randy V is offline  
Old 10-11-2010, 05:10 AM
  #3  
jon928se
Addict
Rennlist Member

 
jon928se's Avatar
 
Join Date: Nov 2003
Location: Sydney NSW, OZ. ex NZ, ex UK
Posts: 2,581
Default

5sp or auto ?

If auto = poss flex plate rivets

If 5sp = poss missing nylon bush on the ball at the top of the clutch release arm or loose guide tube in the clutch.

Could be loose exaust joint somewhere that gets loaded up when the motor is loaded while driving stopping it rattling.
jon928se is offline  
Old 10-11-2010, 01:39 PM
  #4  
littlebobby
User
Thread Starter
 
Join Date: Jan 2010
Posts: 37
Default

is there any way to check the torque converter? any specific test?
littlebobby is offline  
Old 10-11-2010, 03:50 PM
  #5  
vze2jshn
Addict
Rennlist Member
 
vze2jshn's Avatar
 
Join Date: Aug 2003
Location: New york, New york
Posts: 506
Default

Intermiitent loose components in cat(s)?
vze2jshn is offline  
Old 10-11-2010, 04:05 PM
  #6  
Mark SF
User
 
Mark SF's Avatar
 
Join Date: Sep 2010
Location: San Francisco Bay Area, Santa Clara
Posts: 187
Default

Not untraceable, merely untraced.

With the car on a lift and a sharp ear or a stethoscope it would be the work of a moment to trace the source of the noise.

It does sound like drivetrain noise though.
Mark SF is offline  
Old 10-11-2010, 05:56 PM
  #7  
SharkSkin
Addict
Rennlist Member
 
SharkSkin's Avatar
 
Join Date: Jan 2004
Location: Boulder Creek, CA
Posts: 12,620
Default

I narrowed a similar noise to loose cat internals. It goes away when driving because the exhaust pressure holds the loose pieces in place. Get one of those mechanic stethescopes with a long metal probe and hold it against the cat, etc. You can also use a long screwdriver held to your ear or a length of vac hose but those approaches are generally less effective.
SharkSkin is offline  
Old 10-11-2010, 06:19 PM
  #8  
littlebobby
User
Thread Starter
 
Join Date: Jan 2010
Posts: 37
Default

thanks guys i will try all of these approachs as soon as my audi is out of the garage. i need to start paying somone ls to do this **** lol. I nvr get a break.
littlebobby is offline  
Old 10-11-2010, 06:20 PM
  #9  
littlebobby
User
Thread Starter
 
Join Date: Jan 2010
Posts: 37
Default

and to answer earlier questions it is an automatic.
littlebobby is offline  
Old 10-11-2010, 06:25 PM
  #10  
928mac
Super User
 
928mac's Avatar
 
Join Date: Oct 2009
Location: Alberta, Canada
Posts: 2,637
Default

Is it louder under the car or under the hood.
near the rear or near the front
928mac is offline  
Old 10-12-2010, 08:26 PM
  #11  
littlebobby
User
Thread Starter
 
Join Date: Jan 2010
Posts: 37
Default

It sounds about where the cat is, its louder from under the car
littlebobby is offline  
Old 10-13-2010, 10:34 AM
  #12  
Jerry Feather
Addict
Rennlist Member
 
Jerry Feather's Avatar
 
Join Date: May 2008
Location: 2706 Skyline Drive, Grand Junction CO 81506
Posts: 4,542
Default

Hi Bobby. I bumped Troy928's thread about broken flex plates for you. I suspect you are having the same problem--broken flex plate. If so it is likely related to previous damage to the car that resulted in a slight bend in the juncture between the engine and torque tube, if the break is the front flex plate, or between the torque tube and the transmission if the break is the rear flex plate. In either case i think you are going to need a new torque tube.

Jerry Feather
Jerry Feather is offline  
Old 10-13-2010, 08:08 PM
  #13  
doo600
User
 
doo600's Avatar
 
Join Date: Oct 2009
Location: Chicago Suburbs
Posts: 47
Default

I believe I have the same thing. I posted it in a video on this site today. Go here-->>

https://rennlist.com/forums/928-foru...er-here-2.html
doo600 is offline  
 


Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: