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I recently bought a Cayenne S 4.8 from 2008. After a month the HPFP went down so I repaired that (900 euro), no problem if it is just a standalone incident but it seems to be very common for the 4.8 engines. Mine was already replaced with the former owner in 2010 and 2011.
My engine was replaced in 2010 by Porsche and now this engine has around 100k kms (so the second HPFP failed just after a couple of thousand miles). This made me thinking about the build quality of the Porsche engines. The HPFP is not Porsche made I guess (Continental is written on it) but if "I would be" Porsche, I would look for another manufacturer for these parts. So I already got the impression that they are not as typically German as I thought. Then I got in touch with other Cayenne owners over the internet/facebook etc. And the first 10 owners (with a 4.8 engine) warned me for cylinder scoring because they all had their engine replaced or sold their car because of this problem. I knew the 4.5 had this problem but I remember calling a Porsche dealer a couple of months ago to ask if the 4.8 was better build and they said it didn't have any issues like the 4.5 had with the cylinder walls. So I checked again why my car had a new engine and indeed, also mine had scored cylinder walls at the time.
Some people say it happens because of starting the car in freezing conditions but in Belgium, it doesn't get that cold like in Alaska or Scandinavia. I suspect just a bad build engine or the wrong use of materials for the cylinder walls.
It would be nice to know how common this is on the 4.8. I am very interested in how a car works and why an engine can fail so I would like to know who has or had an Cayenne 4.8 (S, GTS or Turbo) and if you ever encountered this problem.
Hi Porsche people
I changed the spark plugs of my 955 CTT yesterday and I think the plug on cylinder 6 is not as the others. For me it does not show a realy scary image,
and I'm sure it is not urgent but can you see something more?
2002 911 C2 Coupe
I'm having the classic misfire on cylinder 1 when the car is wet. I used contact cleaner on the ignition wire plug into the coil and it works fine for now. I/m sure when it gets rained on it will misfire again. Already replaced spark plugs. I discovered there is a tear in the little orange gasket (green arrow in photo) on the ignition wire connector and water is getting in there when it rains. Anybody know where I can find a replacement without buying a new $812 engine wiring harness?
By Rod Croskery
As a newbie to Porsche mechanicals, every project is an adventure. This time hurry and a lack of information enabled a stupid error. I filled the power steering reservoir (I think) with brake fluid.
While removing a front axle on my '04 S recently I disconnected the right brake line at the calliper. The fluid ran into a pan. All went well until I tried to bleed the brakes upon reassembly.
With my mind on the problem down below, I opened what looked like the brake fluid lid, checked to see that the power bleeder I found under the bench fitted, then dumped in almost a half-litre of brake fluid. Understandably, the pump had no effect upon the bleeding action at the wheels. It was pretty bewildering at the time, though. I vacuumed out the DOT 4 and replaced it with hydraulic fluid from my Kubota, subject to finding a method to drain and purge the power steering system.
One can make all sorts of comments about senility or dumb geezers at this point, but a more profitable approach would be to produce a photo of a Cayenne engine bay, beauty panels removed, and clearly labelled in the manner the best and most helpful of the DIY Tutorials are done on this site. It wouldn't be hard to label the file so that newbies looking for basic anatomy information on their Cayennes would learn that the brake reservoir is under a panel below the windshield wiper.