Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Thump at Quick Accelleration from Stop

Recommended Posts

Hi guys,

I have a 2000 Boxster Tiptronic with almost 97k miles.  Over the past few weeks a "thump" has developed when I accelerate quickly from a stop (sitting at a stop light or stop sign).  It feels like it is inertia related, like something is moving back, when I punch it.  I feel the thump, don't really hear anything.  If I do fast start in 2nd gear, I still feel a thump, but it is much less.  If I accelerate at an average rate then it doesn't happen in either 1st or 2nd.  At first I thought it was maybe a slip in the transmission, but since then it really feels more like something is actually moving to create the thump.


Car is running great otherwise, no CELs, no leaks, normal temps, etc.  I did rebuild the transmission in Oct 2013 and have almost 5k miles on it since then so I am probably overly sensitive to things that seem to be transmission-related.


Please let me know if this sounds familiar to any of you and what I can look for in diagnosing the problem.




Link to comment
Share on other sites

I have a question about the "stop" p/n 986-375-255-01.  When I removed the carrier/mount assembly, there was only one of them on mine on the "nuts" side of the bracket:


There wasn't one on the "bolts" side:


The parts diagram shows one on each side (#3 in the diagram), but as you can see above there was definitely only one on mine.  Should I have two?  Should I add another one?


My mount was completely shot...the guts literally fell right out when I took out the bolts...



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.