Davidsj

Hi Larry, I have just read your post, sorry to hear but I am in the same boat I own cayenne 2004 s v8, purchased from opc, fully serviced by opc so it would have no problems, however never had the warranty. It began shuddering, mis firing, I took it to opc they did a compression test and confirmed that cylinder 7 was showing no compression. TO continue investigating they need to strip the engine down and see if piston, bore, scoring or valve damage. They have said that it is possible it may need new engine, like you hav pointed out, the cars value and new engine value are not far apart, so what do you do? Have you found the underlying problem with yours, did porsche offer any goodwill?

Hi Larry, I have just read your post, sorry to hear but I am in the same boat I own cayenne 2004 s v8, purchased from opc, fully serviced by opc so it would have no problems, however never had the warranty. It began shuddering, mis firing, I took it to opc they did a compression test and confirmed that cylinder 7 was showing no compression. TO continue investigating they need to strip the engine down and see if piston, bore, scoring or valve damage. They have said that it is possible it may need new engine, like you hav pointed out, the cars value and new engine value are not far apart, so what do you do? Have you found the underlying problem with yours, did porsche offer any goodwill? Have followed the forum occasionally and now have a question re a current problem .. My wife's Porsche Cayenne S - 2004 with 65k miles - owned from new - has developed an engine noise which initially sounded like valve ticking, but is now a more distinct engine knock. The symptom is a distinct ticking or knocking noise on every second rev (car idles very low at some 580 rpm at moment, giving some 290 knocks/minute. The knocking disappears at higher revs (> 1,500-2,000) but does not go away entirely when engine warms up. The knock appear to come from the right hand top area, but couldn't rule out "piston slap". Other than this the car runs smooth with full power and no misfire, no smoke, oil and coolant fine. Last year we had to replace the silly coolant pipes in the V of the engine after the plastic ones cracked with loss of coolant, and Porsche also did a full service at the time. Car came back from service very low in oil (about min on dipstick) and with a faulty oil pressure / temp sensor, which we discovered a little later. Wife took the car to Porsche outside London, where they did some simple diagnostic (without the use of endoscope or camera) and declared that one of the cylinders was scored and that a new engine was the prescription - hand over £14k plus VAT please.. Not fun at all, and the diagnosis seem questionable...how can you verify scoring in the cylinder by peering through a small spark plug hole without an endoscope... Took it to another dealer for a listen-to, and the technician there thought it was likely top related (Cam, valve bucket..), whereas the service manager suggested piston slap. Car going back tomorrow for some more diagnostic, perhaps the cam cover has to come off... So the meter is running.. I wonder if in your aggregate wisdom you would have some advice for me. I've heard everything from Cam / valve buckets through water pump to piston slap, but given the symptoms is one or the other more likely? I certainly intend to pursue the issue with Porsche UK to try to get some goodwill contribution (not easy when car is 7 years old and out of warranty. The car had major cooling pipe replacement and associated engine oil sensor issues less than a year and 5k miles ago at the main dealer (Porsche in their wisdom used plastic coolant pipes in the V of the V8, and these pipes are prone to cracking which happened - as described in detail elsewhere on the forum. If worst case is confirmed, where can one source a good engine, given that a new engine is gong to be uneconomical relative to the cars residual value... Thanks for your pointers..