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)

2004 Cayenne Turbo only 4 cylinders firing

Recommended Posts

I have a 2004 Cayenne turbo with 160,000 miles on it. Have had a rough idle since I purchased it a few months ago. Cleaned the throttle body, air filters, replaced spark plugs 5-8 as well as coil packs for 5-8. Still have the same rough idle with CEL mostly solid, although after replacing plugs and colis was getting flashing CEL (codes vary from P0300, P0305,P0306,P0307,P0308 to just P0305, P0306, etc.


I have tried just taking off the connector on one coil and it is the same. I tried taking all four connectors off on the 5-8 bank and still the same. Checked fuses, both Bank 1 and 2 appear and test fine.


Disconnected the MAF on that side and still the same.


Tried jiggling wires to no avail.


What can I possibly do next?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • 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.