2010 Cayenne S idles rough in the warm weather but seems fine once moving, just stumbing below 1000rpm. When the weather cools off it runs normal. I pulled the computer fuse for 20 seconds and also tried testing the fuel pumps. Cleaned the maf's, swapped the maf's. Reset the computer by taking it completely out for an hour, tried running it with out the mafs. Found a T fitting on a vacuum line on the top of the motor passanger side blocked off, not sure if its a vacuum issue or what here is what durametric says. I have been fighting with this for weeks. I seem to see missfires on bank one all of the time, mostly cyl 3 but get them for all randomly, I have swapped coil packs, plugs, and injectors to the other bank and no change.
Get error codes P2404, p1353, p1372, p1351, p1354. from my regular reader as durametric gives me codes I cant find anywhere but they are
0424, 7213, 5113, 5313

 

That vacuum connector cap in the rear is the same on my CTT, so that is not an issue. You should also check your air filters, if you haven't already.

While screenshots are nice, data logs are better. Try to get RPM, fuel trim, MAF values, Lamda bank 1 and 2, and Misfire counters for all 8 cylinders.

Also, you should get the latest Durametric software since they had an issue before where the previous versions would invert error codes. They have corrected that in the last couple of months; not sure on which version though.

 

I'd like to see fuel high-pressure adaptation ranges 1 through 3.

 

Got some spreadsheets
http://lightningaudiopro.com/new/2014_07_02_18_58_50.xls

 

http://lightningaudiopro.com/new/201...2_19_04_01.xls

 

I see a lot of time and technology tied up in your diagnosis but what does your dealer say?

 

Start with new mafs, all new injectors and coil packs and plugs. However I just cant accept that after moving everything from one bank to another and the problem doesn't move. I rather not throw money at a problem, just rather find out the source of problem and fix it.

 

Ran high pressure adaption setting and logged them. Any ideas?

http://lightningaudiopro.com/new/201...0_08_08_20.xls
http://lightningaudiopro.com/new/201...0_08_12_24.xls

 

Did you ever find the source of the problem for all those codes giving you a rough idle? I have codes p1353 p1372 p1351 p1354 on my '08 Cayenne GTS with rough idle. Dealer informally believes it's the hydraulic actuator for the variocam on the back side of each bank under the valve covers.

 

Ended up being a lift actuator solenoid, dealer charged me about $512 most of that was labor and it took care of the issue. Hopefully I am not jinxing myself.