Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 08-22-2019, 10:40 AM   #1
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Rear Thump

I can't put my thumb on it. I have an 01, 40K Miles and I keep hearing a thump in the rear when I go over bumps. Is it the convertible top, rear suspension? Or something else?

Thoughts?

__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 08-22-2019, 12:02 PM   #2
Registered User
 
piper6909's Avatar
 
Join Date: Jan 2019
Location: PA
Posts: 1,531
Quote:
Originally Posted by Ciao View Post
I can't put my thumb on it. I have an 01, 40K Miles and I keep hearing a thump in the rear when I go over bumps. Is it the convertible top, rear suspension? Or something else?

Thoughts?
Most likely your rear lower control arm bushings. unfortunately they're not replaceable, you'd have to buy new arms.

https://www.pelicanparts.com/More_Info/98633104307M80.htm?pn=986-331-043-07-M80&bt=Y&fs=0&SVSVSI=
piper6909 is offline   Reply With Quote
Old 08-22-2019, 01:50 PM   #3
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Has the center motor mount ever been changed?????
blue62 is offline   Reply With Quote
Old 08-22-2019, 02:52 PM   #4
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Quote:
Originally Posted by blue62 View Post
Has the center motor mount ever been changed?????
No; not to my knowledge. Bought the P car from brother in law with only 37K miles 2 years ago
__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 08-22-2019, 03:35 PM   #5
Registered User
 
piper6909's Avatar
 
Join Date: Jan 2019
Location: PA
Posts: 1,531
The sad part is that with the LCA bushings and the Center Motor Mount, you can't tell if they're bad until you removed them.

My money is still on the LCAs I mentioned on my prior post. I had the same noise where I couldn't tell if it was suspension or the convertible top frame. I did some research and found that they were common culprits so I changed them and noise gone! Although now I'm starting to get some noise from the fronts...
piper6909 is offline   Reply With Quote
Old 08-22-2019, 04:00 PM   #6
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Quote:
Originally Posted by Ciao View Post
No; not to my knowledge. Bought the P car from brother in law with only 37K miles 2 years ago
The rubber center on mine was completely gone at 47000 miles.
I heard dull clunks when I would slowly go over speed bumps
If the problem is your center motor mount you can sort of feel it when you let out the clutch or went taking off from a dead STOP.
blue62 is offline   Reply With Quote
Old 08-23-2019, 08:37 AM   #7
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Quote:
Originally Posted by blue62 View Post
The rubber center on mine was completely gone at 47000 miles.
I heard dull clunks when I would slowly go over speed bumps
If the problem is your center motor mount you can sort of feel it when you let out the clutch or went taking off from a dead STOP.
98-3/4% confident it's not motor mount.
__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 08-23-2019, 08:50 AM   #8
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Quote:
Originally Posted by piper6909 View Post
The sad part is that with the LCA bushings and the Center Motor Mount, you can't tell if they're bad until you removed them.

My money is still on the LCAs I mentioned on my prior post. I had the same noise where I couldn't tell if it was suspension or the convertible top frame. I did some research and found that they were common culprits so I changed them and noise gone! Although now I'm starting to get some noise from the fronts...
I am leaning towards the LCAs as the source.
__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 08-23-2019, 12:02 PM   #9
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Could it also be the drop links?
__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 08-23-2019, 01:45 PM   #10
Registered User
 
Join Date: Mar 2013
Location: New York
Posts: 347
Garage
Probably rear track arms. If you replace do the drop links to. I did, and it solved the problem. The bushings wear out over time.
Blackcloud is offline   Reply With Quote
Old 10-06-2019, 01:20 PM   #11
Registered User
 
Ciao's Avatar
 
Join Date: Dec 2015
Location: Denver
Posts: 866
Garage
Turns out the rear clunk/thump noise was from the rear storage cabin. One of the locking nuts/screw was loose and rear cabin was making the thumping noise through bumps...Ha!
__________________
5280 Cruising @High Altitude
Seal Gray & K&N Filter
Ciao is offline   Reply With Quote
Old 10-08-2019, 12:03 PM   #12
Registered User
 
Join Date: Mar 2013
Location: New York
Posts: 347
Garage
Lucky you!

Blackcloud is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page