2013 Cayenne Diesel - stalls - bad gas??
12-11-2015, 02:35 PM
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2013 Cayenne Diesel - stalls - bad gas??
Hello all, I have a 2013 Cayenne Diesel with little less than 17k miles (Plano, TX). During the week of thanksgiving I noticed that the vehicle was hesitating during left yield turn (it almost stopped). The next day the vehicle stalled completely during pickup at stop light, happened 4 times!! I took it to an Porsche dealer and after diagnostics I was told that its due to bad gas. They confirmed that there were no faults stored in DME of any events.
They emptied the fuel tank, replaced fuel filter and tank full of diesel for over $700!!!! The service adviser said they found mildew on the fuel filter.
BTW, the fuel filter was replaced in April 2015 and I get the diesel fuel either at Shell or Chevron. I am really concerned about this. Has anyone heard about any such issues with Cayenne Diesel due to bad diesel? Assuming this is true, I am not even sure how to avoid such "bad" diesel!!!!!!
Also, any advise on where/how I can get second opinion? Any Porsche specialists in Dallas region?
They emptied the fuel tank, replaced fuel filter and tank full of diesel for over $700!!!! The service adviser said they found mildew on the fuel filter.
BTW, the fuel filter was replaced in April 2015 and I get the diesel fuel either at Shell or Chevron. I am really concerned about this. Has anyone heard about any such issues with Cayenne Diesel due to bad diesel? Assuming this is true, I am not even sure how to avoid such "bad" diesel!!!!!!
Also, any advise on where/how I can get second opinion? Any Porsche specialists in Dallas region?
12-11-2015, 03:24 PM
#2
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It's fixed right...and the money spent? So not sure why you need a second opinion. Try and buy your diesel at high volume stations - it can go bad and can get water in it.
12-11-2015, 03:35 PM
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Along with the high volume diesel vendor (think truck stop) use an additive like Opti-max or something similar. We got a load of bad diesel on one of our construction sites and the bill was $70K in repairs. We are after the insurance carrier but damage done.
12-11-2015, 03:41 PM
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I heard BP's diesel is very good, don't have that in my area! Need to look out for high volume stations!
12-11-2015, 04:00 PM
#5
So the things that stand out to me are that you noticed this on a turn, they claim there were no codes, and the mold.
I know from experience (forgot to bleed the system properly after changing the filter) that it will throw codes (not enough to trigger a CEL though) when it stalls due to lack of fuel.
The mold suggests to me the following:
A) you don't drive it much so the liquid in the filter housing is stagnant.
B) There is a measurable amount of water in the fuel (could be due to sitting if A is true).
C) There is air in the filter housing (mold needs it), but the filter should be 100% submerged.
Those items (especially C) coupled with you noticing during a turn suggest to me that you have an issue with the low pressure side of your fuel system. My guess would be that the pickup is clogged with debris and/or there is something wrong with your fuel pump that is letting air into the system.
1 tank of bad fuel (unless it sat for months (which would be long enough for a good tank to start turning (e.g. water)) is not going to cause mold to grow that quickly. Also while not nearly as tolerant as the old diesels, these motors are still pretty tolerant (compare to gas motors) of "dirty" fuel. It would take a pretty hefty bad mix (e.g. a gallon or more of non-diesel) to be diluted to cause a stall condition on it's own.
I know from experience (forgot to bleed the system properly after changing the filter) that it will throw codes (not enough to trigger a CEL though) when it stalls due to lack of fuel.
The mold suggests to me the following:
A) you don't drive it much so the liquid in the filter housing is stagnant.
B) There is a measurable amount of water in the fuel (could be due to sitting if A is true).
C) There is air in the filter housing (mold needs it), but the filter should be 100% submerged.
Those items (especially C) coupled with you noticing during a turn suggest to me that you have an issue with the low pressure side of your fuel system. My guess would be that the pickup is clogged with debris and/or there is something wrong with your fuel pump that is letting air into the system.
1 tank of bad fuel (unless it sat for months (which would be long enough for a good tank to start turning (e.g. water)) is not going to cause mold to grow that quickly. Also while not nearly as tolerant as the old diesels, these motors are still pretty tolerant (compare to gas motors) of "dirty" fuel. It would take a pretty hefty bad mix (e.g. a gallon or more of non-diesel) to be diluted to cause a stall condition on it's own.
12-11-2015, 04:26 PM
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So the things that stand out to me are that you noticed this on a turn, they claim there were no codes, and the mold.
I know from experience (forgot to bleed the system properly after changing the filter) that it will throw codes (not enough to trigger a CEL though) when it stalls due to lack of fuel.
The mold suggests to me the following:
A) you don't drive it much so the liquid in the filter housing is stagnant.
B) There is a measurable amount of water in the fuel (could be due to sitting if A is true).
C) There is air in the filter housing (mold needs it), but the filter should be 100% submerged.
Those items (especially C) coupled with you noticing during a turn suggest to me that you have an issue with the low pressure side of your fuel system. My guess would be that the pickup is clogged with debris and/or there is something wrong with your fuel pump that is letting air into the system.
1 tank of bad fuel (unless it sat for months (which would be long enough for a good tank to start turning (e.g. water)) is not going to cause mold to grow that quickly. Also while not nearly as tolerant as the old diesels, these motors are still pretty tolerant (compare to gas motors) of "dirty" fuel. It would take a pretty hefty bad mix (e.g. a gallon or more of non-diesel) to be diluted to cause a stall condition on it's own.
I know from experience (forgot to bleed the system properly after changing the filter) that it will throw codes (not enough to trigger a CEL though) when it stalls due to lack of fuel.
The mold suggests to me the following:
A) you don't drive it much so the liquid in the filter housing is stagnant.
B) There is a measurable amount of water in the fuel (could be due to sitting if A is true).
C) There is air in the filter housing (mold needs it), but the filter should be 100% submerged.
Those items (especially C) coupled with you noticing during a turn suggest to me that you have an issue with the low pressure side of your fuel system. My guess would be that the pickup is clogged with debris and/or there is something wrong with your fuel pump that is letting air into the system.
1 tank of bad fuel (unless it sat for months (which would be long enough for a good tank to start turning (e.g. water)) is not going to cause mold to grow that quickly. Also while not nearly as tolerant as the old diesels, these motors are still pretty tolerant (compare to gas motors) of "dirty" fuel. It would take a pretty hefty bad mix (e.g. a gallon or more of non-diesel) to be diluted to cause a stall condition on it's own.
12-11-2015, 04:41 PM
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gnat, the response I got from service adviser is "The fuel filter is not completely submerged. it’s a canister type filter located at the engine of the Cayenne. It has fuel that runs through it to minimize the amount of water/contaminants entering the high pressure side of the fuel system. If there were a leak present, a check engine light would illuminate, storing fault codes for the leak. Currently, there are no faults present."
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12-11-2015, 05:32 PM
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carsfan001: I have a similar story to share with the 2014 CD driven about 14K miles so far, although I've got the emissions check engine failure. The dealership said the fuel filter had rust and dirt, computer had registered the fuel pressure failure. There was a diesel smell in the car. The high volume gas station claimed nobody else had complained. The fuel filter was also replaced, just like in your case. The comprehensive insurance paid for it minus the deductible. Chances are your insurance may chip in too.
Needless to say, I'm now filling at another gas station. Still, either the Cayenne is too sensitive to fuel or possibly the fuel pump is letting garbage in somehow in both cars of ours.
Needless to say, I'm now filling at another gas station. Still, either the Cayenne is too sensitive to fuel or possibly the fuel pump is letting garbage in somehow in both cars of ours.
12-11-2015, 05:50 PM
#9
Then something must be wrong with mine. *
It's kinda hard to see in the pic that shows the top of the filter once it's uncovered, but there is fuel washing the top and is splashes out as soon as you try to mess with it:
http://www.6speedonline.com/forums/c...el-filter.html
* That is sarcasm BTW. I've never seen a diesel motor that had air in its fuel filter housing when functioning correctly.
It's kinda hard to see in the pic that shows the top of the filter once it's uncovered, but there is fuel washing the top and is splashes out as soon as you try to mess with it:
http://www.6speedonline.com/forums/c...el-filter.html
* That is sarcasm BTW. I've never seen a diesel motor that had air in its fuel filter housing when functioning correctly.
