Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 924/944/968 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
thierry75's Avatar
 
Join Date: Aug 2004
Location: Brooklyn, NY
Posts: 60
Garage
Knocking sound

My car suddenly makes this weird knocking sound that seems to come from the transmission tunnel. This coincided with the tachometer behaving erratically after a "spirited" driving stint. i just had the car checked out by a reputed Porsche shop and had new shocks put in all around. I can't figure this out...HELP!
__________________
924S
1987 Black/black
5 speed
74.5K miles
http://www.p-caronline.com/directory/sexborg75

'boredom is a sin, boredom is unholy'
Old 04-02-2005, 02:37 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
SoCal Driver's Avatar
 
Join Date: Feb 2002
Location: Costa Mesa
Posts: 8,587
Garage
Rubber center in the clutch is gone.
__________________
Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 04-02-2005, 05:05 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
thierry75's Avatar
 
Join Date: Aug 2004
Location: Brooklyn, NY
Posts: 60
Garage
Ouch!! a friend of mine thinks it could be the driveshaft-is that possible? the noise almost disappears when I turn left for some reasons...anyway i'm taking it in to a mechanic tomorrow
__________________
924S
1987 Black/black
5 speed
74.5K miles
http://www.p-caronline.com/directory/sexborg75

'boredom is a sin, boredom is unholy'
Old 04-03-2005, 05:35 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Sep 2002
Location: Indy, SIU Carbondale
Posts: 659
Send a message via AIM to Trevor
C.V.?
__________________
1987 Black/Black (sold)
96' Jetta (RIP)
1986 N/A (Sold)
2001 Taurus noooooooooooooo!
1993 325is
Old 04-03-2005, 06:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
thierry75's Avatar
 
Join Date: Aug 2004
Location: Brooklyn, NY
Posts: 60
Garage
I thought about that too-i just had the suspension checked though and they found nothing wrong other than the shocks
__________________
924S
1987 Black/black
5 speed
74.5K miles
http://www.p-caronline.com/directory/sexborg75

'boredom is a sin, boredom is unholy'
Old 04-03-2005, 06:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
ae1969's Avatar
 
Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
Send a message via ICQ to ae1969
Transmission mount is the other possibility.
__________________
Alex - PCA Polar Region - Boxster Muncher
86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD
www.edmontonhomelife.com
www.edmontonrealestate.ws
Old 04-03-2005, 06:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Registered User
 
arbita1's Avatar
 
Join Date: Aug 2004
Location: Mahopac, NY
Posts: 2,233
Garage
I just had this happen to me.

Is the sound at all times or only when driving? If it's all the time, try pressing the clutch and see if it goes away. If so, it's your transmission.

My second gear on the input shaft lost a few teeth and was causing the knocking sound.
__________________
Matt.

83 911SC
85.5 944 NA - Sold
Old 04-04-2005, 06:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
Rmills944's Avatar
 
Join Date: Oct 2004
Location: Memphis
Posts: 340
Send a message via AIM to Rmills944 Send a message via Yahoo to Rmills944
I'd jack it up and check for play in the CV shafts just in case. CV's usually make noise under acceleration until they get real bad. These will send a weird vibration up the whole drivetrain though.

If your rubber center on the clutch goes out, you'll hear more of a howling sound when under acceleration. If you let that go too long, you will need a tranny and clutch job ($3500 if you have a shop do it) - ask me how I know....
__________________
Ryan
'84 944 moneysucker edition (SFR, Corbeaus, etc.)
'02 Jetta TDI 280Lb/Ft 145Hp @ wheels. RC2 PP357's
Old 04-04-2005, 11:31 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
thierry75's Avatar
 
Join Date: Aug 2004
Location: Brooklyn, NY
Posts: 60
Garage
double ouch!! I haven't taken the car in yet but it sounds more and more like the CV's - there's no noise at rest only when it's moving - it's definitely not a howling sound, more of a rattle
__________________
924S
1987 Black/black
5 speed
74.5K miles
http://www.p-caronline.com/directory/sexborg75

'boredom is a sin, boredom is unholy'
Old 04-04-2005, 05:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
thierry75's Avatar
 
Join Date: Aug 2004
Location: Brooklyn, NY
Posts: 60
Garage
just an update and quick thank you...it was a broken axle bearing-which is probably why the noise stopped when I turned left-she's back on the road and sweet as ever!!
__________________
924S
1987 Black/black
5 speed
74.5K miles
http://www.p-caronline.com/directory/sexborg75

'boredom is a sin, boredom is unholy'
Old 04-12-2005, 08:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Apr 2003
Location: Durban,South Africa
Posts: 327
Garage
Always good to get feedback when a problem is solved-we all learn. I thought it would be the rubber centre on clutch as Socal said, as I had to replace mine not long ago and symptoms were similar.
Old 04-13-2005, 03:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 05:57 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.