Cayman 718 GPF Failure

[Cyclemotor1958]

Hi Guys& Girls

Without prejudice

Following on from my last post regarding exhaust back pressure on our GPF filters.

Found this on YouTube, it shows you the function of the differential pressure sensor and how important this sensor and its readings are to the emission device on our cars.

See link below.

I know I go on about checking for back pressure when these cars are reporting the 100% oil ash load, and the need to change the filter.

But if the differential pressure sensor information is correct, and reading are very low, then we have the answer.

Normally if a filter is starting to get quite blocked, you would see a reading at tickover between say 10 to 100 HPA.

If you increase the revs to between 2.5 and 3K you may see 250 to 300 HPA.

In the last 2 days I have seen sensor readings no higher than 4.0 HPA convert this to PSI and you get 0.058 PSI.

I have said many times that the data we are seeing on these GPF filter reports page 42, make no sense at all.

Yet the dealers and Porsche seem to be ignoring the wrong information that's recorded on their report, and it's been the same on all the GPF reports I have seen over the last year.

Let's use the information we have and start looking at the real issue.

We have Cars that had filters fitted last year, that already have high oil ash % figures recorded and they will be going back into the dealers for them to have another look at this problem.

We could save Porsche alot of money if we check the actual back pressure before the exhaust are removed.

Sorry to go on again

Dave

 

[Paul-718gts]

Well as you know Dave my car is back in next week for further investigation work following its first VAL check that showed a reading of 27% Ash after 500 miles of driving with a new filter being fitted under warranty along with a new sensor.

I believe at the time my car may have been the only one that had both parts fitted at the same time ?

I must say the Principal at the dealership has been very supportive, along with his team of Gold techs.

With the additional tests and questions that we have requested hopefully this will help find the root cause we are all seeking.

Let’s hope we can use this as an opportunity to finally find a solution to this ongoing issue.

 

[Cyclemotor1958]

Morning Paul,
Looking forward to getting some positive results and explanations, fingers crossed.
Have a good weekend, catchup soon
Dave