Jump to content

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)

Vibration when in gear


Recommended Posts

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

Link to comment
Share on other sites

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

I'll be curious to see some comments. I get the samein the low 2000 range, then gone.

I know I have some light suspension issues (bushing, strut bearings) and posibly a common rear motor mount issue. Maybe the later will be the solution as I seem to notice the vibration about the same time some other rear motor mount issues arrised.

Link to comment
Share on other sites

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

is it only during deceleration and not also with acceleration? if it's both, i would check tire pressures and get the wheels balanced.

Link to comment
Share on other sites

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

is it only during deceleration and not also with acceleration? if it's both, i would check tire pressures and get the wheels balanced.

Flywheel or pilot bearing. I'm about to change my clutch in the next few weeks and find out which it is. I'm not replacing the flywheel so if the vibration is still there when I'm finishied, it's the flywheel. Either the bearing wears or the flywheel wears off center and causes the problem.

The reason it does not vibrate when accelerating is the engine is putting the pressure on the spin. Since the flywheel/pilot bearing are straight off the crankshaft, the spin is more balanced. On deceleration, the wheels are putting the pressure on the spin so the balance is centered on the tranny end of the drive shaft. If the pilot bearing/flywheel are the problem, then they are at the end with less pressure and can spin out of balance more easily.

The other factor that will tell you it's in the drive train is if it happens in more than one gear at the same rpm. If so, then it's at different speeds. Different speeds mean it's not in the wheels or suspension. Wheel/suspension problems depend on speed of the vehicle so they would happen at speed ranges no matter what the rpm.

Since the problem in mine started I've had the car aligned and balanced just because it was time to do it and there is no difference in the vibration so don't waste your money with balancing/alignment unless it's just time to do it.

Edited by deliriousga
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.

Guest
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.