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)
BobWard
-
Posts
1 -
Joined
-
Last visited
Content Type
Profiles
Events
Forums
External Paint Colors
Downloads
Tutorials
Links Directory
Collections
Classifieds
Store
Everything posted by BobWard
-
Hi. So sorry if this has been covered in another post, but I was unable to find anything. Could someone please explain how the PCV valve on a 958.2 Cayenne S works? Each PCV valve sits on top of the valve cover and has one hose connecting to the intake manifold and another hose running down to turbo air inlet hose. It seems to me that the hose connecting to the intake is pulling a vacuum on the crankcase during idle and low throttle opening. Does the other hose pull vacuum at larger throttle openings since the intake vacuum should be lower at that time? The reason I ask is I'm getting oil in the intake and I'm assuming it's causing the knock sensors to pick up detonation because the timing is being severely retarded and no boost pressure. I lose so much power that hills I normally climb in 8th gear with 1-2 pounds of boost can only be climbed by the transmission downshifting to 4th gear. Once the RPM's get up to about 4K the turbos come back online, but still not full power. No engine codes! I can drive backroads all day at 55-65 MPH and no problems, can drive highways on cruise control at 65-68 no problem. But when I get on the interstate and cruise at about 78 MPH for about ten minutes, I start losing power and boost. If I pull off the interstate and drive slower it eventually begins running good again, until getting back on the interstate. I've read about the DME update that's supposed to desensitize the knock sensors, but when I first got the car eight months ago it didn't do this. I installed a couple oil catch cans in line with the hose going from the PCV valve to the intake and it helped drastically. It went from taking ten minutes to lose power to taking about an ninety minutes. I've thought about trying to plug the PCV hose going to the turbo air inlet hose and seeing if the extra suction is causing the oil to be pulled out of the engine. If I pull the PCV hose off the intake after a short drive there is a puddle of oil sitting in the intake hose port. Maybe I have a whole other problem and that other problem is causing my engine to not tolerate the oil? Any help would be greatly appreciated!!!
