My
Cayenne
S (high miles, but STILL in excellent condition and RUNS like a BEAST!) started developing weird electrical problems (lights not working, then working, then turn signals working, then not working, windows not going up and down normally, horn blows out of the blue, etc, etc), and after MUCH research, I discovered that the AC drain tube, being located on the front passenger side, gets clogged and needs cleaning frequently. Because of this clog, the car develops wet carpet unon that (front) side of the passenger compartment, which causes 'weird electrical issues to come and go', because wiring runs underneath the carpet on that front side! SO, I believe all my problems will be solved (if and when) I can figure out a way to:
Protect that wiring from the ever-appearing water leaks from the AC unit clogging up
Devise a way to fix the AC-clog problem, perhaps create a secondary drainage scenario for that so I don't have to constantly worry about my carpet being wet
Any and all help would be MUCH appreciated!
The PET Porsche Parts Manual is linked on this site (Planet-9). You can freely download it without issue.
SAI.png
ochristofferson
Feb 4, 2024
108-005
It's on diagram 108-005.
All of these parts are located on top of the engine under the intake manifold.
The Workshop manual is not freely available except as a boot leg copy.
Thank you so much for your help! Actually I'm looking to PURCHASE the most complete and thorough workshop manual for both of these vehicles. I just today created my free account here and upgraded it to a paid membership so I haven't really had time to do much looking yet, is there any way that you could paste a link to the parts manual you were referring to that is available free here on the site? Anyway thank you again for your help!
Hello James, welcome to Planet-9. It looks like this is your first post. I suspect the Admin is going to move this to the repair sub-forum. Don't feel bad, I get confused on where things go also.
A little background. The secondary air pump pumps air into the
exhaust
tract when the engine is first started. This creates a lean condition, which produces excess heat. Its function is purely to warm up the catalytic converters as quickly as possible. Depending on where you live, it may or may not be required as functional to make your car emissions compliant. Frankly, if it is not working, it is one of the lesser things in this world that you could be doing to kill the planet. But again, depending on where you live, you may have to get it working. I going to guess you got a FAIL regarding its Ready Status.
It only operates for a few minutes. When it is functional, you will get a little bit higher idle, say 1100 rpm. When it shuts off the idle drops to around 800 rpm.
So you are right, it has several components and the fault could be several things. First of all,
Porsche
service or even my lowly self can activate the pump with the car not even running. I've done it to my car with my Durametric device, just to hear it run without the engine noise drowning it out. It's just an electric motor that drives an air pump.
So if it doesn't respond to the activation test it could be:
1. A bad electric motor.
2. Failed wiring, which would include all sorts of things like fuses and relays, just to name a few.
3. Failed activation logic in the
ECU
.
It the pump is working but the idle speed does not increase, that would indicate that the required air is not making it to the
exhaust
. That could be:
1. A failed
rotor
on the pump.
2. Failed supply lines from the pump to the input
points
on the manifolds. BTW, unlikely. The pump sits right over the air injection point on bank 1 and it has a metal hard line that snakes over to the top of bank 2.
I recently rebuilt the engine on my
2007 Cayman S
. I remember even sitting on the bench, it was a little bit of puzzle as to how to free the pump from its moorings. It resides just to the passenger side of the starter motor. I have included a picture below. I'm not going to say a determined DIY guy couldn't tackle this but I would give it 3-4 wrenches out of 5 from a difficulty standpoint.
There you have it my friend. Good luck!
Wow, Harvey! Thank you so much for your well-articulated explanation of this situation! I appreciate it and will use it as a guide moving forward with the correction of the problem, whatever that ends up being
Here is one source for the
Porsche
PETs:
Porsche® Parts Diagrams (PET)
www.9xxteile.com
Indeed the Admin is moving it - it's in the wrong subforum. So it's moving. We don't have a subforum for "All
Porsche
Tech Questions" - so please in the future, make separate posts/threads for each vehicle in their correct subforum. You'll get better answers that way. I'd suggest reading:
https://www.planet-9.com/threads/before-posting-a-technical-question-read-this.253613/
There are PDF manuals for the series 1 Cayenne (which yours is) available on eBay - they range from OK to awful. The awful ones are 11,000 pages in one PDF with lots of errors. The OK ones are broken up by category into smaller PDFs - makes searching easier. The big flaw in them is they repeated every repair procedure for every variant of the 955. Note that these are ALL from earlier versions of the Cayenne, the 955 series. It's close enough for many things that they're worth having. I know of no decent manual for these cars. One thing to investigate is AllDataDIY.com - there is some sale going on at the moment - if you decide to subscribe let me know I'll try to find the sale code. AllDataDIY is expensive, but it's also quite good at least for the Porsches I have it for. I can't speak for the '08 957 series since I never owned one.
You can see in my SIG what AllDataDIY subscriptions I have. Based on my Boxster one, which is quite good - you might take a chance on one for your Cayman - it's an earlier series (.1 rather than .2 that started in 2009) - but hopefully the quality is the same, which is very good.
OK - hang on - thread in motion... "Scotty - fire up the engines to max power.. we're going in..."
Thank you @
deilenberger
for your help and direction on this, and also ifor enlightening me to the protocol(s) for posting - both were very helpful
Perfect example of a
Porsche
nuts helping other
Porsche
nuts… love it!
