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)

Recommended Posts

hi all.

after a night of wot I suddenly lost boost

I have zero boost with this faults  p1248 , P0299 , P1080        2008 cayenne  turbo

if I clear the codes p1248 shows then the rest show up later when I drive


I changed both diverter valves one was not sealing I changed driver side turbo to intercooler Oring 3oz of oil 


still no boost ?



Link to comment
Share on other sites

Short answer is probably not zero boost but definitely much reduced. If the MAP sensor is disconnected or not working at all this will give you Absolutely no boost. 

Smoke test the intake by removing the map sensor on top of the intake Y pipe and smoke test it. Some home made smoker ideas are on YouTube. You have to disconnect the air box pipes and bag them closed to hold the smoke inside the intake areas which would normally be under boost. 

Check your Diverter valves as well and vacuum pipes to them are air tight if you blow.

I posted my DV and pipe fix on here. Search my posts. Good luck 

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.