Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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)

Tiptronic Lock-up Clutch problem: 2000 996 C4 Cab Tip RoW


Recommended Posts

I have a 996 C4 Cabrio Tiptronic MY 2000 ROW (European spec), with just over 130,000 Kms done. Last week the Lock-up Clutch failed. I took the car to an OPC, but it seems they don't have transmission specialists employed. First option the workshop came up with was to change the torque converter unit and if that would not work replace the gearbox. Obviously all at my expenses. I'll safe you my opinion :censored: .

On this forum I found a few alternative solutions :renntech: that I mailed them to look at first: ATF to low or old, i.e. compressible because there's too much water in it; MAF sensor faulty; bad wiring between DME and Tiptronic. They have checked these, but all seems well. Now they want to take the car to a transmission specialist while at the mean time they mailed the symptoms to the service network at the factory (reason I don't do that myself is that the OPCs here have fixed service prices; I don't pay for all the extra hours, just for the solution and parts).

Still I don’t believe the torque converter unit or gear box are broken. Can anybody help me with following reasoning:

  • the engine runs as beautiful as ever :)
  • gear changes go just as smooth as always, both up and down through all speeds
  • what should happen at speeds over some 60 Kmh is that when the input and output speed of the torque converter is about equal, the lock-up clutch is engaged
  • that does not happen: the revs change immediately when I press or release the accelerator; normally when the lock-up is engaged, the revs are more or less fixed with the driving speed only until brake or kick-down is used;
  • the remaining slip in the torque converter means that the engine runs at over 2500 RPM for just 100 Kmh, which is absurd
  • if the torque converter unit would be broken, this would imply some part came off internally; the unit then would run out of balance, which immediately is apparent; it does not resonate at all at any speed between 1000 and 5000 Rpm

My conclusion is that the next things they should look at is the solenoid valve that directs the ATF through the torque converter. It should reduce ATF pressure behind the clutch plate, through which it closes (re page 14 in http://www.autoshop101.com/forms/AT02.pdf ; I know that's from another brand, but it is the same ZF technology).

Any other (better) ideas where to look and documentation to look at? Your help would be appreciated!

Cheers,

Marco

Edited by mpcevat
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.