Cayenne S 2007-2010 (957) High Pressure Fuel Pump (HPFP) Replacement DIY - Page 4 -
Navigation » > Technical & Track Disussions > Porsche Technical Discussions » Cayenne S 2007-2010 (957) High Pressure Fuel Pump (HPFP) Replacement DIY

Porsche Technical Discussions Porsche related technical discussions and questions go here.

Thread Tools Display Modes
Old 12-07-2015, 04:11 AM
987kmns's Avatar
987kmns 987kmns is offline
Join Date: Jul 2012
Location: Annandale, VA
Posts: 290
987kmns has five HoF threads987kmns has five HoF threads987kmns has five HoF threads987kmns has five HoF threads987kmns has five HoF threads

Glad to hear the new HPFP cured the problem!

2007 Cayman S Track Car
2008 Cayenne S
2004 911 GT3
2011 Boxster S

2001 Boxster S - Sold
2007 Boxster S - Sold
Reply With Quote
Old 12-21-2015, 03:07 PM
thedude2u thedude2u is offline
Join Date: Dec 2015
Location: Carlsbad, CA
Posts: 1
Default MY08 CTT HPFP Replacement

Hello all. I`ve been monitoring this thread for some time as I have recently had the HPFP replaced on my 2008 CTT. I had the same symptoms. Rough idle, hesitation/jerky acceleration, and eventually stalling (scary when driving!). There was no noticeable smoke with any of these conditions, but I`m sure it could be possible given the rough running conditions.

Normally this is a job that I would take on myself. The OP did a good job writing up the swap and it looks easily within reach of the average shadetree mechanic. However, my wife and I were moving across country and my tools were in storage over 2000 miles away. So I swallowed my pride and took the car to the dealer to have the pump replace at ~$2k.

The pump replacement seems to have fixed all of the issues. I haven`t experienced any crank/idle/stalling issues since. However, I have a new problem now that I think may be related to the pump install. The engine/transmission now seems to be surging a low/part throttle and the upshifts have become very harsh. When I am cruising around town (low engine load) and going on/off throttle, the engine seem to apply to much power and then too little causing the acceleration to oscillate. It honestly makes you kind of queasy after awhile.

Is there a calibration procedure or software update that is supposed to be done as part of the HPFP replacement? I don`t have any active codes currently (at least visible by OBD). I don`t have Durametric currently (thinking about buying a kit) so I can`t monitor the current rail pressure to see if it is out of spec. It just seems coincidental that these symptoms started happening right after the pump replacement. It`s driving my wife and I crazy!

Any ideas? Anyone else with similar symptoms?

P.S. I know I`m not living in VA currently, but I thought I would post since this is one of the better HPFP threads I found online. I`m originally from Roanoke and graduated from VT. That counts, right?!?!
Reply With Quote
Old 03-25-2016, 08:39 AM
boxs boxs is offline
Join Date: Mar 2016
Location: Bulgaria
Posts: 1
Default Porsche Cayenne s eNGINE PROBLEM

I plug it to diagnostic tools and i have this message (camshaft pos. sensor bank 2 range )
I had change the camshaft sensor on both side and the engine still not running
Rough Sound smells Gas .
Do the engine skip a tooth ?
Helpp !!!
Reply With Quote
Old 03-25-2016, 03:03 PM
Dr K's Avatar
Dr K Dr K is offline
Colorado's finest
Join Date: Apr 2005
Location: Montgomery County, MD
Posts: 15,249
Dr K has two HoF threadsDr K has two HoF threads

We've gone international. Unfortunately, Boxs, I can't help you. Good luck, though.
Peter (not "Pete") K.

Vicegrip: "The best way to buy speed in bikes is purchase less food. "

2009 911 C2S Coupe "The Green Car"
1992 Miata ("SSM") race car
2004 Toyota Prius - Back-up DD
2016 Toyota Highlander (wife's DD and my new tow vehicle

Gone and missed:
2006 Dodge Durango - sold to a Dorki
2003 Acura MDX - Just shy of 200K
86 Black 911 Coupe race car (owned 2010-2016)
86 Gold 911 Targa (owned 1998-2012)
82 WineRedMetallic 911 Targa (owned 1986-7)
Reply With Quote
Old 07-05-2016, 11:35 AM
Parenn911's Avatar
Parenn911 Parenn911 is offline
Loose Lips Sink Ships
Join Date: Jun 2003
Location: Concrete Jungle
Posts: 5,847
Parenn911 has one HoF thread

Great thread, excellent write up!
'79 911
'04 955
Reply With Quote
Old 05-15-2017, 08:24 PM
missing951 missing951 is offline
Join Date: May 2017
Location: NOVA
Posts: 1
Default Fuel pressure too high (P0674)

Hi I am experiencing somewhat of a different problem. I have 2008 Cayenne V6 which also has a HPFP for its direct injection system. I keep getting a CEL (check engine light) that comes and goes. No drivability issues, no power loss although it runs a bit ragged at startup.

The code that comes up consistently with my Durametric is P0674:

Fuel rail pressure sensor - inappropriately high - Upper limit value exceeded, test conditions are not-completed, fault is currently active and is not causing a DTC light.

Sometimes also accompanied by

Warm up catalyst efficiency below threshold bank 1 - Value below lower limit value, test conditions are not-completed, fault is not currently active and is not causing a DTC light

I have replaced the Fuel rail pressure sensor, but unfortunately I don't have an appropriate fuel pressure gauge to measure the actual values. The V6 ECU does not report the fuel pressure like it does on the V8s for some reason so I can use the Durametric to get the actual values.

Could a failing HPFP cause a too high pressure condition? I was thinking the nonsensical too high reading had to be an electrical fault of some sort thus the replacement of the sensor. I have not dug into the wiring harness or anything like that yet because it will be a nightmare to get to. A previous post mentioned that it is the check valve in the pump that tends to go(preventing it from building pressure) rather than the mechanical pump itself. Is there a built in relief valve as well?

I've been stumped by this for some time but since there was no change in drivability (just the CEL) I have let it linger. Any thoughts?
Reply With Quote
Old 01-11-2018, 05:27 PM
nasocbr nasocbr is offline
Join Date: Jan 2018
Location: Bulgaria
Posts: 1

Hi all,

I have the same problems with my HPFP and I am planning to replace it soon.
How can I get the photos from the DIY instructions on the first page?
I am a bit concerned about this "clutch" and mounting.
Is there a calibration procedure or software update that is supposed to be done as part of the HPFP replacement? i don't have Durametric or any other software.

Thank you
Reply With Quote
Old 01-14-2018, 01:14 AM
tmiller02 tmiller02 is offline
Join Date: Jan 2018
Location: st. louis
Posts: 1

ditto.... any idea where the pictures are?
Reply With Quote
Old 01-14-2018, 01:38 AM
Jazzbass's Avatar
Jazzbass Jazzbass is offline
Site Admin
Join Date: Feb 2003
Location: Germantown, MD
Posts: 11,566
Jazzbass has eight HoF threadsJazzbass has eight HoF threadsJazzbass has eight HoF threadsJazzbass has eight HoF threadsJazzbass has eight HoF threadsJazzbass has eight HoF threadsJazzbass has eight HoF threads

Photobucket used to be a free image host but about a year ago they turned off free hosting and broke millions of bbs posts like this around the world. Hopefully the original poster will edit his post with images uploaded here directly.
Chris M
1985 911 Carrera with a couple cosmetic only mods
2006 E90 330i
1999 E46 328i
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump