Cayman 718 GPF Failure

[911hillclimber]

That is solid progress indeed.
There is now a heap of solid data that can be used to prove in 2019 and just before a new filter was deemed the solution and production parts revised. Did not work then or now. Wonder how the Design Dept came to that solution?

The people that can resolve this have moved on, unavailable or simply unaware of this issue, or instructed to not engage with it at all.

Dead End.
I do not know what the next step is Personally.
Everyone who can influence this are not interested, scared of the outcome or just happy to be in the Porsche fortress.
As for those who buy these affected cars? They must end up somewhere as parts?

And the past owners sitting in BMWs etc.

we all wish you well Dave.

 

[Scrounger]

Motoring press is the next step in my opinion. They'll love a juicy story and Dave has done most of the hard work for them. If Dave submits a brief overview to any motoring publisher, they will get in touch to discuss, then ask for a suitable tome for a photographer to come and take any photos and then they'll email Porsche GB for a comment. You may be surprised how quickly Porsche will get in touch.

Personally I feel this is the only way that you'll get Porsche to sit up and take note.

Dan

 

[Cyclemotor1958]

Hi Dan,

Before we contact the press we need to make sure that our owners of these faulty cars contact their respected Dealers and ask for the back pressure check to be done, before anything else is done to the car.

If the Dealers refuse to do this back pressure check, and continue to insist that these filters are blocked with ash, then we will look into the possibility of considering seeking legal proceddings against them for miss diagnosis of an emission control fault.

When they see the GPF data on their PWIS diagnostic testers they see a differential pressure sensor reading that is virtually none existent regarding pressure. Why on every occasion has this been ignored.

The lack of pressure totally contradicts a blocked exhaust filter, so it looks like they skipped the mandatory differential pressure sensor functionality check outlined in the technical memo dated 3rd of March 2025.

The contract to diagnose and repair the car is between the customer and their Dealer.

If the Dealer needs further assistance on the diagnosis of this fault they contact the Porsche Warranty and Technical departments.

So if it was the case that Porsche Technical have refused to allow back pressure checks to be carried out, then that would be recorded in the Technical notes on the vehicle file.

So we just need to see who is responsible for this major miss diagnosis of this fault.

Regarding the press, let's just see what happens from now, hopefully our Dealers will see that the correct diagnosis of this fault has always been required, and a simple back pressure check needs to be done, to do so.

Dave

 

[patersont718t]

Great progress Dave, my car in now in the dealer after Porsche authorised the memo checks but said they weren’t authorised to do a back pressure check so wouldn't do one, we’ll see where we go after they’ve completed the checks. One question, we all subscribe to this club. What is Porsche Club GB doing to help? They must be aware of your fight to help us all, what have they offered in support and surely they must have contact at Porsche reading to facilitate a meeting or at least contact?

 

[Cyclemotor1958]

Hi Tony

Sorry I was typing my post has you where sending yours.

Unfortunately the Porsche Club can only do so much, I have had help from John along the way, and its been appreciated.

But I always knew we would have dig into this issue ourselves and find a resolution.

We have found a resolution, if your Dealer is saying that Porsche technical are not allowing them to do a back pressure check, they need Porsche Technical to put this in writing to you.

Because they are going to start taking things of your new car looking for reasons of internal oil consumption that could cause over time ash accumulation in your GPF.

The AOS is easy to check, using a manometer connected to the oil filler cap.

A good reading is around 30 to 35 inches of water at tick over.

They can use the same manometer to check the back pressure.

The Dealer will not mind carring out checks that take a long time, they get paid by Porsche, and if your car is taken to bits for the sake of it, they don't mind either, its not their car.

And bearing in mind when they checked your car for its extended warranty the fault was present and they where we'll aware of this fault before you even bought it.

And when you challenged them, they started the conversation by saying, your paying for it from my understanding.

Which has happened to all our poor owners who purchased their cars through the Dealer network.

They even changed the extended warranty from a part that wasn't mentioned in the exclusion section of the Warranty, to one that is now, in brackets.

These Dealers, and we have records who they are, have diagnosed these cars incorrectly and when push comes to shove, they will blame Porsche, who have always been responsible for this fault on these cars.

And let's not forget I was given a technical case number after I contacted Porsche Stuttgart for help twice.

And has of today, still no contact, and all I wanted to do was ask why wasn't the back pressure being checked by the Dealers to try and remove the expensive modified GPF from the quotation thats been given to our owners.

That's all.


Dave

 

[Motorhead]

One question, we all subscribe to this club. What is Porsche Club GB doing to help? They must be aware of your fight to help us all, what have they offered in support and surely they must have contact at Porsche reading to facilitate a meeting or at least contact?

That was done a while ago - probably you’ll find reference to it somewhere in this thread - and I think involved Dave, John Dickinson the Cayman Register Secretary and a Club official who, I seem to recall, wrote an article for PP. Someone with a better memory than mine should be able to point you in the right direction.

All to no avail unfortunately!

Jeff

 

[Cyclemotor1958]

Hi Tony,

Sorry Ive been discussing this with a few of my technical mates, and they can't believe they will not do a back pressure check.

When you think about it, is bloody ridiculous that they think they can get away with not doing this important check.

Infact this test is deliberately not done, thats been obvious for a very long time.

They know that no pressure is there, so whats their argument for not doing the test.

The truth will come out on this eventually, and Porsche will have some explaining to do their customers.

Just think of the cars that have had their original GPF systems removed and replaced with none approved exhaust systems because they couldn't be bothered to do the diagnosis correctly.

GPF built cars without GPF filters, absolutely disgusting behaviour.

Please keep us in the loop regarding the checks they are going to do, hopefully they won't be removing your engine to have a look for possible internal signs of oil consumption.


Dave