Menoporsche Posted March 5 Report Share Posted March 5 Look for part number revisions? Quote Link to comment Share on other sites More sharing options...
Paul P Posted March 5 Report Share Posted March 5 3 minutes ago, Gramps said: The pump itself is definitely mechanical (driven off the end of the camshaft) and that side of it would seem to've been fine. I get the impression the solenoid side of it actually opens a valve that lets the high pressure through. It seems that maybe the solenoid was sticking but eventually opened and once open it was fine. Also no probs whatsoever once warm or even a few hours after stopping the engine, like bbrbob says if left till cold/next day or beyond then you were back to square 1. Who knows, may even have been just a bad connection to the solenoid that was cleared when it was disconnected?? God I hope not 🤣. I checked the piston and washers on the valve operated by the solenoid and all looks good, again if there was a mechanical issue with that valve I though I would've possibly seen something amiss. Mine was high 80's when the problem was first noticed, but on googling some of the MY2009 & MY2010 cars that had the HPFP replaced by Porsche were well below 40k miles?? My MY2011 didn't qualify for free replacement by Porsche and it did last a fair while so maybe Porsche did rectify whatever the initial manufacturing problem was?? Makes sense. Just looking at some of the wording in the docs around the error codes and the valve is mentioned. It also talk about the car detecting a “long start” (think it said 6 seconds of cranking) and then it goes into low pressure start mode. Will try and dig some more and find out what that is. Might tally with the early symptoms of cars seeming to be sluggish to start. 1 Quote Link to comment Share on other sites More sharing options...
Paul P Posted March 5 Report Share Posted March 5 18 minutes ago, Menoporsche said: Look for part number revisions? There was a revision last year but I heard that the revision and the delay was “moving out of the factory in the Ukraine and relocating to Poland” but that may just be rumour related to the back orders and they have fixed the failure in the process. Quote Link to comment Share on other sites More sharing options...
Terryg Posted March 6 Author Report Share Posted March 6 Reading the info kindly provided by @Paul P it appears there is a possibility that it is the low pressure pump failing to provide enough fuel to the HPFP. I am increasingly leaning toward sending it to the specialist. Quote Link to comment Share on other sites More sharing options...
Terryg Posted March 6 Author Report Share Posted March 6 Reading the info kindly provided by @Paul P it appears there is a possibility that it is the low pressure pump failing to provide enough fuel to the HPFP. I am increasingly leaning toward sending it to the specialist. Quote Link to comment Share on other sites More sharing options...
½cwt Posted March 6 Report Share Posted March 6 19 hours ago, Paul P said: There was a revision last year but I heard that the revision and the delay was “moving out of the factory in the Ukraine and relocating to Poland” but that may just be rumour related to the back orders and they have fixed the failure in the process. Change of supplier even if no change of design is sufficient for a part number up issue, as it changing an integral part of the assembly like a relay or valve. Quote Link to comment Share on other sites More sharing options...
Terryg Posted April 19 Author Report Share Posted April 19 Just to close off the thread, the specialist fitted a new in tank pump and said it is fixed, a dealer friend of his has offered me good money for it so as of tomorrow it will no longer be mine. Hopefully a 1998 2.5 manual is incoming, will post pics and info if it happens. Quote Link to comment Share on other sites More sharing options...
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