2008 turbo starting problem
 

I recently acquired a 2008 turbo from a client. It belonged to their dad and has an unknown history. The car sat for several years. It starts on the first try , runs rough after that for 20 seconds, then dies. After the initial start it will not fire again, it just turns over. After sitting all night it does the same thing the next day. It has a new battery, fuel pump relays and fuses, plugs are in good condition and clean. My friend and I are thinking its an issue in the fuel system. We took the cover off the fuel pumps and when the key is turned you can here the pumps but very faint. Never owning a Cayeene I would not know the norm for that. The fuel pumps on my 911 are much louder when you turn the key. Has anybody had experience with fuel pumps and testing them? The car acts like it is getting no fuel.

Not to be insulting or anything but how old is the fuel?

Gas
 

Not insulting at all. Since I wrote the post I talked to the previous owners kids. They didn't realize it was out of gas at and they continually tried to crank it. I have added 6 gallons of new gas. After reading several post about Cayennes running out of gas I am now thinking the fuel filters are are toast as a result. Any thoughts?

Did you get her running right?

Not running well
 

Sorry for the slow response. I got pneumonia and had to put all on hold. The car is still not running after initial start. It's at a friends and we have gone a bit deeper.
The car starts and stalls when giving throttle or under load.
We can hear the pumps priming when the key is in.
The air filters were very dirty, replaced.
MAF sensors dirty and the wire was missing on both, had to order two new ones
Coolant was clean
Oil filter was wasted. No metal seen in it. I
Oil is not milky at all.
Plugs are clean, not fouled.
Coil packs look good
Fuel filter changed. The gas that came out of the old filter was really dirty. Drivers side tank looked full, passenger side looked empty. Is that normal?
The car had set for a year. Steam from oil filler area when cap removed smells like gas. Venting less now.
The car is getting spark but seems to have a problem with the fuel system. Does anyone know where the port is on the 2008 turbo to check fuel pressure?

Had pneumonia this year too...sucked!!

I'm not a mechanic but if the MAF's were FUBAR'd, that could well account for a lot of the issue. Good to address all the stuff listed and I cant answer the fuel tank stuff.

Fuel in the crankcase would have me concerned. I'd want to be confident that was all gone before starting/driving but may be a result of extended fuel delivery when cranking without being able to drive it and smell like a bigger problem than it is.

Thanks for keeping us posted and please continue to do so!

Update
 

Thanks for the response. We went through quite a bit today.
Compression check showed all in acceptable limits.
All coils were tested and we were getting spark.
Fuel pumps are operating. The car actually ran ok under load and with throttle for 5 minutes now. Eventually it stumbled and died. It was running very rich. We think we have narrowed it down to the MAF's or fuel pressure regulator. I just need to find out where the fuel rail is to test pressure. Any thoughts for a 2008 turbo?

Update
 

Fuel filter was installed. It made a big difference but still stalling after a long period. Still a labored start.
MAF's came in and were installed. Fired up immediately. Ran well but after about 5 minutes it stuttered and died when given throttle.
we are looking at vacuum leaks, clogged injectors, and fuel pumps next.
Compression is good and coil packs are operating properly.

Thank you for taking the time to document your ordeal here. I hope you get her on her legs soon.

I don't understand why this section is so dead but posts like yours may put some life into it!

Another update
 

Thanks Pavulan! Here's the latest. Every day it runs better but still struggles and dies after a while at idle. We are still trying to find the ports to test fuel pressure. We just need to get to the fuel rail. I believe it would be under the center engine cover. We are not sure about that one. We are also going to test for vacuum leaks. Have any of you done that using smoke?
High fuel pressure could be the problem. I read that if pressure gets to high as a safety measure the fuel injectors shut down. If pressure is good then we have to look at vacuum leaks and anything else you can think of.
PS-the company in Spain that makes the MAF sensors work well. $50 each as opposed to $280.00

anything new here?SmileWavy

Car sat for several years, with little gas.
Possibility that gas tank rusted, severely.
Rust particles and pieces thereafter continuously clog stuff up - all the way to the injectors - but usually closer to the tank. Shake loose or flow thru, ok for moments to longer, then nothing.