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Recommended Posts

Posted

2008 Cayenne S starts and runs fine.  Fuel high pressure setpoint and actual values match.  After driving 20 miles, shutdown and leave car for a while and when I return, car starts normal, idles for 5-10 seconds then gets rough and ultimately dies.  HP fuel pressure drops from setpoint like being starved of fuel.  Fuel pressure, key on engine off, about 5bar.

 

Now history: 135K miles

  1. Cracked fuel filter - Replaced
  2. Engine would die at 1/2 tank.... bad LP fuel pump - Replaced Both VDO (138K) Then in a few hundred miles the problem mentioned above started happening every few hundred miles
  3. Replaced fuel pressure regulator - problem happened again
  4. Replaced High Pressure Fuel pump and Sensor 

Problem still exists .... 

 

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