|
|
|
|
| Author |
|
|
Registered
Join Date: May 2005
Posts: 95
|
Thump at rear when accelerate!
Car is a Tip 996tt. I've been encountering a clunk at the rear sometimes when I accelerate from a low speed (around 30 mph at 3rd gear). Mechanic said the engine/tranny mounts are tight. The subframe is ok. The sway bar and U/CV joints are all ok. The "thump" doesn't happen all the time. Mechanic was unable to find the problem. Any idea?
|
||
07-05-2005, 07:09 PM
|
|
|
Registered
Join Date: May 2005
Posts: 95
|
Can anyone shed some light on this please?
|
||
|
07-06-2005, 01:43 AM
|
|
|
Semper drive!
|
how about your rear-wheel bearings? Has your mech ruled those out?
Randy
__________________
84 944 - Alpine White 86 Carrera Targa - Guards Red - My Pelican Gallery - (Gone, but never forgotten  )One Marine's View Igitur qui desiderat pacem, praeparet bellum |
||
|
07-06-2005, 01:48 AM
|
|
|
Registered
Join Date: May 2005
Posts: 95
|
Yep. Mech said they are ok.
|
||
|
07-06-2005, 01:52 AM
|
|
|
Registered
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
|
How about a locked rear shock absorber? It happens often with the Konies, some folks say is due to the lack of use...
|
||
|
07-06-2005, 12:59 PM
|
|
|
Registered
Join Date: Feb 2002
Location: DTX
Posts: 2,409
|
Could you describe it in more detail? a metallic "thunk" vs. a muffled "thump", general location, left/right wise, maybe it happens at a certain rpm, or a gear change?
__________________
89 Carrera 3.4 "There is a right way to go around a corner - it's called the line." -- PCA DE speaker bryteside.com - good things happen. |
||
|
07-06-2005, 01:07 PM
|
|
|
|
Registered
|
Check out the handbrake, I've had mine not release fully - then while accellerating the last portion releases and makes a "thump".
__________________
ßrandon |
||
|
07-06-2005, 02:20 PM
|
|
|
Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,000
|
Does this car still have warranty?
Jeff
__________________
Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
||
|
07-06-2005, 03:04 PM
|
|
|
Registered
Join Date: May 2005
Posts: 95
|
Thanks guys. I've asked my mech to check the suspension and he said they are ok.
The sound is more like a metallic "thunk". The location of the "thunk" sound is from the rear around the engine area (it seems to come from underneath the engine, maybe from the exhaust). It doesn't happen all the time. Sometimes it happens when the car accelerate (not WOT) at a cruising speed of around 30 to 40 mph (at 3rd gear sometimes 4th gear, probably around 2000 rpm). The thunk sound does not seem to be from the transmission coz it is from the rear end of the car. Mech thinks that it could be a backfire. I am not sure if this "thunk" sound is actually describe by other people as "ping" in the engine (spark shock). Since I have been using high level octane gas so the sound shouldn't be the sound of a detonation (plus it doesn't happen all the time). Any views? |
||
|
07-06-2005, 06:39 PM
|
|
1986 Porsche Carerra Targa 3.2
1987 Porsche 911 Carerra
