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)

Idle not dropping when I clutch


Recommended Posts

I checked my tire size. I do have 265/40R18 tires in the rear, and the manual does call for 265/35ZR18.

I turned the traction control off, and the hanging idle is completely gone.

The only thing that puzzles me is that I had those tires on there at least six months before I noticed the issue. I wonder if this is really a tire size problem or some other malfunction in my ABS/Traction control unit.

But yes, turning off traction control made the problem go away.

Link to comment
Share on other sites

Wow, well there you go! So the problem is finally solved (other than that it didn't seem to be noticed immediately after the new wheels went on)?

-James.

I went back over my records. Last spring not long after I got the new tires I started having high idle issues, which were tracked back to a vacuum leak from a broken oil filler tube. Just a couple weeks later I noticed the hanging idle. It's an intermittent problem, and I think it must have been originally masked by the vacuum leak.

The kicker is that I just bought new rear tires in February. If I'd only known then.

It feels really good to finally have a solution though.

Link to comment
Share on other sites

  • 2 weeks later...

I just simply can't believe all you went thru. tire size? wow. I think psm light should got on immediately after those tire size.

Porsche dealer saying... no it's the DME...lol

PIWIS, PTS2 saying no problems

the rest of suggestions were locally acceptable :lol:

Link to comment
Share on other sites

  • 1 year later...

Just an update. I'd been driving with the traction control off for the past year to remedy the idle issue. I was very paranoid that when I finally bought new tires, the issue would remain and that the problem would be in my electronics somewhere.

I bought new tires last weekend and got the correct 265/35ZR18 rears. The issue is completely gone, and everything is working perfectly.

Link to comment
Share on other sites

  • 8 years later...
On 4/16/2009 at 2:14 AM, 1999Porsche911 said:

The 99 C2 TC has a cable controlled throttle and the TC does not work in the way you described. I don't see how this would effect the idle.

 

Raising this topic as I had the same symptoms.

The TC actually does work as described when it tries to reduce engine braking torque.

See here for more info

switching off the TC or changing the rear tyres to the right size (285/30R18 or 295/30R18) stopped this behaviour.

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.