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you solved this problem for a lot less dollars than it cost me. I guess that's the price one pays when one is not mechanically inclined and dependent upon the expertise of mechanics.
getting back to this post as per the suggestions of one on the mechanics that has been working on this vehicle for many months. I am now assured this intermittent starting problem is totally fixed. I did receive an unlimited mileage 2 year warranty on the entire starting system from the owner mechanic when I picked up the car today. 2 additional problems were found which has now corrected the intermittent starting problem that I previously experienced. first was a cracked PC board next to the fuse block. the second, perhaps bigger problem was the connector wires located between the 2 firewalls. as I understand it, a bolt had come loose causing the wires to arc. as I understand it, this loose wiring connection resulted in a voltage drop from approximately 12 volts to 3 volts , which is definitely not enough to crank the starter. so, my odyssey as relates to this intermittent starting problem involved the following: replacing the battery replacing the starter and starter relay replacing the alternator cleaning the battery grounding strap replacing the PC board at the fuse block and rewiring or fixing up the wiring located between the engine firewall and cabin firewall perhaps the best thing that happened to finally locate this ghost in the machine was for the car to totally fail without any ability to jump start it. I think this may have provided the mechanics with an opportunity to hone in on the problem and isolate the 2 problems that resulted in this starting problem. of course a lot of expensive process of elimination was incurred along the way with the replacement of some pretty expensive parts which may or may not have been necessary. hope this is helpful should anyone else encounter an intermittent starting problem with their Cayenne.
the mechanic had suggested replacing the grounding strap (which is what I believe you are referring to as the earth strap). is this something that is under the carpet just in front of the driver's seat? thanks for your input, much appreciated.
I appreciate your advice and will act upon it to have my mechanic check the wiring. it does make sense that extreme heat could cause a brittle or partially non-insulated wire to ground out against another wire or metal part. the car is a 2005 so 12 years old. however, why is the Rockford portable battery starter able to jump start the car when the car will not crank on its own when the ignition key is turned? I guess it could be a wire from the starter relay to the battery such that when the key is turned the relay "sees" no battery, and when the Rockford is put in place now there is a battery? does anyone know the electrical path as relates to starting the cayenne? I sure don't. is it that electricity flows from the ignition key to the battery to the starter relay to the starter? I do believe that ekstroemtj may have the right idea about this problem being faulty wiring inasmuch as the major components (starter, battery, starter relay and alternator) have all been replaced. the wiring has not been replaced. thanks for your feedback ekstroemtj. once again, I welcome and appreciate any and all comments/ideas from others as well.
OK, 2005 cayenne turbo. intermittent problem with starting. had independent Porsche mechanic replace the battery, alternator, starter and starter relay about 9 months ago. very intermittent problem which happens about once every 3-4 months. seems to be more pronounced in very hot weather (90-100 plus degrees Fahrenheit). when it happens the engine simply will not crank at all. in spite of that I will still have radio, horn, power windows, AC, etc, full electric. in the past I have simply used a Rockford battery jump starter (given to me by the mechanic) and this starts it right up. today, I parked in a multilevel parking structure at a mall and the outside ambient temp was over 100 degrees. I parked with another vehicle in front of me, as well as 1 vehicle to each side. not much air circulation. temp inside the parking structure exceeded that of outside I am sure. the Rockford, unlike past times, would not immediately start the engine. I almost called AAA roadside assitance. fortunately, after about 6 tries with the Rockford, I was able to start the car. drove the car from that 100 degree climate for about an hour to an 80 degree climate. parked it outside. turned it off. wanted to test starting it; she started right up without hesitation. repeated this several times with no issues. anybody have any ideas about this intermittent ghost in my machine? I really love this vehicle and I'm willing to consider replacing additional parts if necessary (ignition assembly, etc). other than this intermittent problem, this car with 175K miles runs fantastic. any and all thoughts are appreciated. thank you.
mrzeus2012 replied to mrzeus2012's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)I appreciate your input. quite honestly I have never personally performed any work on my vehicle. a non-Porsche mechanic described using AC pro as simple as putting air in a tire. apparently AC Pro contains sealants as well as refrigerant. thought maybe this would work sort of like fix a flat. I guess you can already tell I'm in over my head, lol. last thing I want to do is attempt what appears to be a simple repair and in doing so cause a major problem with the AC system. my reluctance to proceed in spite of the encouragement I'm receiving from others caused me to shoot this query out to this forum. I appreciate your prompt reply and advice. thanks again.
has anyone ever recharged their AC? I have a 2005 Cayenne Turbo. I noticed the other day the AC is not as cold as it used to be. Has anyone used AC Pro to recharge their AC? I believe the refrigerant is the same as what Porsche uses. Is this something that a novice can attempt, or will this damage the AC system by using an after market refrigerant that is not from Porsche?