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)

2003 Cayenne Porsche Turbo - Random misfires won't go away


Recommended Posts

Hi all,

 

I've not posted much but I am at my wits ends.

 

I have a 2003 Cayenne Turbo that has been running great with loving maintenance. Recently, I had a new coolant leak that I knew wasn't the pipes or the coolant tees as I had replaced them. I removed the intake plenum, found the leak was the small plastic "h" hose going to the rear of the engine under the plenum and replaced it. Everything put back together.

 

Then, I started getting random misfires P0300 errors with P0301, p0302, P303 and P0307. I replaced coil packs with aftermarket coils, no improvement. Thinking I got bad packs, I bought the Beru packs. Error P0300, P0302 and P0307 remained. Replaced spark plugs on cylinders 2 and 7. No go. I still have random misfires on those two cylinders and I am feeling beaten. Today, I thought I would try some injector cleaner, Chevron Techron, to see if it cleared anything up. Maybe an intake got dirty when I had the plenum off.

 

By the way, I replaced vacuum hoses also. No coolant leaks, and no vacuum leaks throwing codes. No P0200 codes either which would indicate injection issues. Each pack and spark plug made improvements, until now. No Durametric codes now except the P0300, P0302 and P0307. Rough at idle and can feel small misfires (is there such a thing as a small misfire)? I was getting this in shape to trade in come March. Now, I am despondent and don't know what to do next except possibly take it to Porsche and spend more than I will get back. Do I just need to try the injector cleaner and drive it a little more? Afraid to drive it too much.

 

Any good advice will be welcomed.

Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

They are connected to wiring harness. The wiring is so tight that there is no way to cross wires from one cylinder to another, at least not on my Cayenne.They are all the way into the spark plug hole, so as best that I can tell, they are connecting to the plug. They are tight and the cover screw is tightened on the coil to the engine.


Sent from my LM-Q730 using Tapatalk

Link to post
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.