I spent Sunday afternoon changing the spark plugs and coil packs on my 2005 Cayenne Turbo.

The tools you need are:
Ratchet driver
Torx E12 socket
Torx T30 bit
Torx T40 bit
Varying extensions
5/8th Spark Plug socket
Flat screwdriver
12mm Triple Square bit
16mm Hex socket

The job took about 2.5 hours. My car had about 78K miles, and the old plugs had heavy carbon deposits and wear...I have not seen previous Cayenne plugs before and do not know if this is normal.

I replaced each plug, torqued them to 25 Nm, and replaced all the coil packs. None of the packs had signs of cracking or wear, but I did note that the design part number had been updated...previous plugs were 03s, the new ones were 07s.

After about 200 miles, I have noted that my mileage has increased from 12 city to 17, and 15 highway to 18. No difference in power, but idle is more consistent from a cold start.

A very easy DIY.

 

Good to hear. What is recommended change? What kind of plugs did you use? I noticed the local parts store had 4 different types of Bosch platinums. I imagine you don't run your car very hard to burn off all the carbon or do you? If you are getting that big of a jump in mpg I'd imagine you have more HP gains than you think - esp. at high RPM.

This car seems to run pretty rich from my exhaust deposits and had an FD rx7 that the guys on the dyno would change the plugs prior simply because fouled plugs would be a huge culprit to top end performance.

 

Since my Cayenne Turbo is not tuned, I elected to use the OEM plugs 99917022190.

My CTT is a daily driver to compliment my 997TT. I do a fair amount of highway and city driving...I bought it with 70K on the odometer, and assumed that most of the maintenance was done...I checked with the original servicing dealership and know that the coolant pipes and belt were done. But looking at the coil pack part code, either the dealership hadn't cleared out their older inventory, or they simply weren't changed.

I was surprised at the jump in mileage, we'll see if it lasts. I've only got about 200 to 250 miles on it so far...I'll report back after a few fill ups.

 

made by beru? Don't know my options, but thinking mine could be changed.

 

that a great jump in mileage im all over this project thanks for the post.

 

I think by the book plugs were supposed to be changed at 40K miles. Yours is probably worn because it was never changed.

 

I would highly recommend to change coil packs when doing plugs, your right there, almost the same cost as the plug, piece of mind..

 

Any DIY's out there on this topic?