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Everything posted by TomBelgium

  1. I know, i meant that it is easy for Porsche to replace the cilinder walls in their new engines during the building process. If you want to repair your existing problem (forever) with better walls and pistons prices are about 5 to 6k euros. But that excludes removing and rebuilding the block in the car. It makes me think completely different about the Porsche brand then a month ago before i knew all this. So sad for such a financial healty brand...
  2. Yeah, I am selling my S too after just one month of ownership. Maybe I buy a 3.6 cayenne (VW VR6 engine) but for sure I don't buy another Porsche with an Engine built by Porsche. A lot of people say a BMW X5 is nothing against an Cayenne and I agree in terms of driving experience but at least I don't have to worry about engine failures when I go on holidays with an X5. With the Cayenne I would never be relaxed taking it for long road trips. Such a shame, I expected more from Porsche and I was really happy the first days I had it until I had the HPFP failure and especially now with all the
  3. I hope so, i found some companies on the internet that delivers stronger pistons and cylinder walls. It seems like a simple fix (for a manufacturer like Porsche), i just don't get it why they didn't changed the cylinder wall material after the first failures back in 2003-2004. BTW my engine was also replaced before i bought it at 40k kms for the same known cylinder issue.
  4. I used to work for a second hand (exclusive) cars dealer. I remember we sold a quite new Panamera with a 4.8 engine after a month it came back with cylinder scoring. And i talked to a few people who owned a Porsche, also 911's, and about 9 on 10 people told me their engine was replaced by Porsche before it even reached 100k kms. Some of them were happy about it and told how good their service is because of receiving a new engine. Of course it is the least they can do, but i do not understand how they have the exact same issue with multiple engine models for almost 2 decades now.
  5. Hello, 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
  6. Update, didn't want to spend more time on fixing the pump so I bought a replacement for 900 bucks. Porsche told me they already replaced it a couple of years ago. I tried to explain that it is not common for a quality car to have 3 different HPFP in just 100k kilometers but they didn't agree. My former daily was a "boring" Skoda Superb diesel, I only had to do regular maintenance, and it had even more kms on the clock than the Cayenne. I am selling my Cayenne now because I also heard about the cylinder issues. My dealer reassured me that only the pre facelift 4.5's had cylinder issues. But I s
  7. Yesterday i took my HPFP out and opened it. I tought that it could be some worn o rings. And indeed, the o rings on the check valve were cracked, so all pressurized fuel leaked back to the low pressure fuel system. So today i bought some new o rings in a specialized store. Put my HPFP back in and tried to start the car. It took as long as before only now the rough idle was gone. Unfortunalty i got a check engine light, the p1023 and p1026 errors and a lack of power above 2000 rpm. Seems like my pump is completely dead now. But the obd shows the the high pressure is maintained when the car is t
  8. Hi, I am trying to figure out if my high pressure fuel pump is faulty. I noticed longer cranking when starting the engine, misfiring when it just starts (or very rough idle the first seconds). After revving a little bit it goes back to normal and the rough idle is gone. This only happens when i leave the car parked for a couple of hours. I already got p1023 and p1026 (reffers to high pressure problems) The high fuel pressure (in the rail to the injectors) loses pressure very quickly when i turn the engine off. It goes from the 40 bar it had when idling to around 4 to 5 bar in some h
  9. It seems like my actual value is following my setpoint high pressure value when driving or idling. But only after the rough running is over. It doesn't keep the high pressure in the rail, i only got around 4 to 5 bar when the car is turned off. I believe it will be a valve in my HPFP as the low pressure (which should be around 5.5 bar) is maintained (it is normal to drop 1 or 2 bar in a couple of hours).
  10. Seems like piwis can give me more useful information about a P1023 that i got. As you can see the actual value at startup is ten times lower as required.
  11. I will check that tommorow, i am leaving the car 24h without starting to check the high fuel pressure to see how much is gone after 24h. Do you know what high pressure value it should have with the engine off? I believe it should be at least 40 bar so it can start easily because the idle requires 40 bar too. I am just trying to eliminate possible failures.
  12. Ok i tried with another OBD reader. Seems like you are right. This ones gives me indeed 40 bar actual value at idle. When driving it goes to around 120bar max. But i do notice that my actual value is fluctuating around the setpoint value. not a lot but when it should be 40bar it sometimes goes to 36 bar or 42 bar etc. But since the biggest problem is at the startup i wonder what the high fuel pressure should be when the car is turned off?
  13. When i start the car after a couple of hours standing still i get a very rough idle, like it is misfiring. It also take about 5 to 10 seconds before the car starts. The rough idle goes away after +- 30 seconds OR when i revv the car a little bit. Then it goes away and idles 'normal' however even then i don't think it is that smooth as it should be. I also notice a lack of power when i fully press the acc. pedal. It's just not as smooth or powerfull as it should be even when the rough idle is gone.
  14. The actual value is only 40mbar while the setpoint value is 40000mbar. Or am i misunderstanding the piwis values?
  15. Hi, thank you for the information. So the actual value should also be 40 bar? And it sucks indeed but at least now i am almost sure it will be the HPFP. I tried both fuel pumps in the tank by taking out the fuses of each one and it kept running on the left and right one. So they seems ok.
  16. Did you ever get the values? I am looking for the correct ones too.
  17. Do you know which setpoint and actual values the HP system should have at idle?
  18. hmm half of the people i talk to tell me it should be that low. Others tell me it should be 40 bar tot 120 bar when running (40 bar for idling)
  19. Do you have any idea what your actual HP value is and what the Setpoint value is? I want to compare with mine to check if my HP pump is indeed failing.
  20. Seems like you are able to read out your cayenne. Could you tell me what your actual value and setpoint values are at this moment? I suppose your car is still ok now? Because my actual HP value is around 5500mbar and the setpoint value is around 40000mbar. I am trying to figure out if my HP pump is dying. Because it already gave me a 1023 and 1026 fault last week.
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