2007 Cayenne Turbo erratic idle / CEL

[lewisweller]

13 minutes ago, TomBelgium said:

Hello, I have also the 1023 error and hard to start problem. How did you resolve it? 

90% it's the Hpfp.

Bank 2 rear fitted tight between the end of the cam cover and the firewall. Many failures have been seen. 

https://dorkiphus.net/porsche/showthread.php?t=33572

[ma77hewsu11ivan]

Ended up ultimately being my high pressure fuel pump. Decided to replace my entire fuel system + HPFP. Not a bad DIY. Moderately expensive. Tight spaces to work. 

[TomBelgium]

On 2-7-2017 at 6:58 AM, ma77hewsu11ivan said:

Ended up ultimately being my high pressure fuel pump. Decided to replace my entire fuel system + HPFP. Not a bad DIY. Moderately expensive. Tight spaces to work. 

Did you got an Check engine light?

[ma77hewsu11ivan]

No CELs initially. First symptom: random long starts. Second: smell of burnt plastic. Third: more consistent longer starts. Then: total failure at highway speed. Scared the heck out of me. Nursed it home. Diagnosed left fuel pump (primary) bad, swapped it out. Improvement. Then fuel filter. More improvement. Then right pump & FPR. Better still; all the while dreading the ultimate reality that my HPFP was also bad. Finally swapped out a rebuilt Porsche HPFP (thing was actually new) and talked PCNA into helping me out. They sent a $500 voucher. Why? Because I asked nicely. Also my car previously had the service campaign for the HPFP and the unit I pulled off was the newest revision so I'm likely now on at least my 4th HPFP in 158k miles.

 

 

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[TomBelgium]

On 7-7-2017 at 6:02 PM, ma77hewsu11ivan said:

No CELs initially. First symptom: random long starts. Second: smell of burnt plastic. Third: more consistent longer starts. Then: total failure at highway speed. Scared the heck out of me. Nursed it home. Diagnosed left fuel pump (primary) bad, swapped it out. Improvement. Then fuel filter. More improvement. Then right pump & FPR. Better still; all the while dreading the ultimate reality that my HPFP was also bad. Finally swapped out a rebuilt Porsche HPFP (thing was actually new) and talked PCNA into helping me out. They sent a $500 voucher. Why? Because I asked nicely. Also my car previously had the service campaign for the HPFP and the unit I pulled off was the newest revision so I'm likely now on at least my 4th HPFP in 158k miles.

 

 

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Did you have a very rough idle at cold starts?

[ma77hewsu11ivan]

Yes. Very rough idle at cold starts.


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[TomBelgium]

7 hours ago, ma77hewsu11ivan said:

Yes. Very rough idle at cold starts.


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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.

[ma77hewsu11ivan]

Should call for and receive 40mb at idle. Mine would sometimes get that, I'd think GREAT then go for throttle up and it'd bog down... Replacing the entire LPFP system that was 8 yrs old helped quite a bit and was absolutely needed, but ultimately it was the dreaded HPFP. Call Porsche and see if they'll help you. They sent me a $500 voucher simply for asking. Rebuilt units (new really) can be found from dealers for around $800usd. Installed it myself. Been running fine since. Future prevention measures: refill my fuel tank now at 1/4 or higher vs letting it run until the light comes on and changing oil more often (5k-ish) with a quality oil (I use Amsoil).


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[TomBelgium]

3 hours ago, ma77hewsu11ivan said:

Should call for and receive 40mb at idle. Mine would sometimes get that, I'd think GREAT then go for throttle up and it'd bog down... Replacing the entire LPFP system that was 8 yrs old helped quite a bit and was absolutely needed, but ultimately it was the dreaded HPFP. Call Porsche and see if they'll help you. They sent me a $500 voucher simply for asking. Rebuilt units (new really) can be found from dealers for around $800usd. Installed it myself. Been running fine since. Future prevention measures: refill my fuel tank now at 1/4 or higher vs letting it run until the light comes on and changing oil more often (5k-ish) with a quality oil (I use Amsoil).


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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)