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About nasocbr

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  • Porsche Club
  • Present cars
    Porsche Cayenne S 4.8 2008
  1. Hi, I have the same problems with the HPFP. All began with 10sec long cranking cold starts and sometimes loss of power when accelerating during highway driving. Then cold starts became harder and once engine was started it was shaking like misfire. Pushing the throttle to 2000rpm for few seconds was solving the problem. On a highway run there was knocking and shaking sometimes when accelerating above 3k rpm. Monitoring the fuel rail pressure while driving showed pressure drop to 10bar and after a while returning back to normal 40-100-120bar depending on the throttle position. About 6 months later and 6000km passed HPFP totally gave up with a rail pressure 5bar (fuel supply pumps pressure) reaching 10-15bar sometimes. CEL is on showing P1021, P1023, P1026, P0431. I am using a simple OBD2 bluetooth reader with Android app. Looking for a new HPFP here in Europe I found out that there are two types: 94811031507 - brand new direct purchase and 948110315GX - refurbished, rebuild, reconditioned with exchange option. As I am planning to do it by myself following the DIY instructions on the forums I have some questions. Can you advise where you get your new HPFP from (Europe) and at what price, what part number are they. Did you remove the intake manifolds in order to replace the HPFP? Is there any adaptation needed for the new HPFP (software, OBD) or it is working straight away after installation? Did you disconnect the car battery when doing all this? Thank you

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