Some stuttering at WOT runs smooth otherwise..
 

Coils and Plugs?? Or something else to check?


140K, coils and plugs were done around 80k

04 Turbo epl flash. bi-pass pipes.

When were your plugs last changed? The Cayenne Turbo requires new spark plugs every 40k miles. I replaced mine around the 50k mile mark and the center electrode was almost completely gone. My car started experiencing some stuttering when cold and a rough idle, so I looked into when the plugs were due -- to my surprise it was every 40k miles! Once I swapped the plugs with fresh ones, all those problems went away. No need to spring for the ridiculously expensive Porsche plugs either. The Denso 4504's worked great for my Cayenne Turbo and at $2.50 a plug are hard to beat! When you have everything apart check for cracks in your coil packs and replace if necessary. If it were me, I would just replace the coil packs at the same time. I just did the plugs in my car last August and yesterday had two coil packs (later revision too) die on me. Oh well live and learn...

Enclosed is Porsche recommendation on spark plugs and service intervals for Cayenne S and Turbo.

Edit: missed the part about when your plugs were last changed! Duh! You're well past due for spark plugs!

OK thanks Dan. Let me know when your free and you can head over and lend me a hand :biggulp:

It's not that bad of a job, I have faith in you! Maybe this video will help you out?

Thanks, but it's always nice to have someone who has done it hold your hand. Ordered the coil packs and will pick up the plugs soon.

I hear ya! Good luck with it! Since you're a former 928 owner this will be a walk in the park.

Dan

As a heads up, the revisions on Porsche coil packs continues unabated. Regardless of what supplier you use, check with the dealer for the latest part number iteration. They change regularly as they try to improve the technology. The latest Turbo part number ends in a .14 suffix. I am not sure what the S models are up to, but IIRC its in the 20's... There are a lot of older coil packs floating around with discount suppliers, so keep that in mind.

Cheers,
TomF

The 2nd set of failed coil packs I just pulled out of my 63k mile CTT were installed 5 years ago and only had 30k miles on them (rev .08). At this point, I have pretty much lost all faith in Porsche making a coil pack that will go the distance so this time around i'm buying whatever is cheapest with the understanding these are a regular service item. I just bought a set of 8 coil packs off of rockauto for $185 shipped and should have them Saturday.

Below is what my cracked coil pack looked like.