Transfer case
12-19-2020, 10:14 AM
#1113
Race Director
I unplugged the transfer case plug and the problem went away. I have a appointment at the dealer Tuesday next week. Am I ok to drive with the plug off till I get to the dealer and then before I go plug back in? Will this cause any damage? Will Porsche be able to tell it was unplugged. Just want to be able to drive the car or short trips to grocery and it’s unbearable with the shuddering. Let me know. Thanks guys!
12-19-2020, 01:00 PM
#1115
Race Director
12-19-2020, 02:07 PM
#1116
So here is a weird one. It obviously throws a all wheel drive fault which I knew it would but now it seems like it also put the car into limp mode. Boost only gets to .3 bar. Is that normal? I know before I unplugged it was getting up to over .7 I believe.
12-19-2020, 03:13 PM
#1117
Race Director
Odd. I have an s not a turbo, so i had no limp mode but maybe porsche is so concerned about the massive power overwhelming a driver with only rwd.
If thats the only change and its that sudden, then maybe its not happy like that. News to me though
If thats the only change and its that sudden, then maybe its not happy like that. News to me though
12-19-2020, 10:45 PM
#1118
Let's say the TC just "cut loose" 100%. Your Cayenne is now a rear wheel drive car.
Direct drive rear wheel drive.
I don't see how it can lose power. Lose some front wheel drive, but that doesn't make a huge difference.
Or if you disconnect the TC control system plug. Again, at that point you now have a rear wheel drive Cayenne.
Where's the massive loss of power...... lost to?
Are your rear wheels spinning, like a smoking burnout?
Can the TC problems be described simply as
"a clutch slipping that results in loss of power to the front wheels of the AWD vehicle"?
Last edited by tmcayn; 12-19-2020 at 10:49 PM.
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FlatOverCrest71 (12-09-2023)
12-20-2020, 07:51 PM
#1121
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Thanks - but there are quite a few people with a LOT more miles than that.... I want to take it to 200k, but that requires solving the mystery coolant leak that a dealer and a premier independent shop haven't been able to. I was recommended a new shop recently - and may have them take a look.
12-21-2020, 04:12 PM
#1122
Rennlist Member
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ironimages (09-21-2021)
12-21-2020, 04:37 PM
#1123
AlbumCover I'm having a hard time understanding this.
Let's say the TC just "cut loose" 100%. Your Cayenne is now a rear wheel drive car.
Direct drive rear wheel drive.
I don't see how it can lose power. Lose some front wheel drive, but that doesn't make a huge difference.
Or if you disconnect the TC control system plug. Again, at that point you now have a rear wheel drive Cayenne.
Where's the massive loss of power...... lost to?
Are your rear wheels spinning, like a smoking burnout?
Can the TC problems be described simply as
"a clutch slipping that results in loss of power to the front wheels of the AWD vehicle"?
Let's say the TC just "cut loose" 100%. Your Cayenne is now a rear wheel drive car.
Direct drive rear wheel drive.
I don't see how it can lose power. Lose some front wheel drive, but that doesn't make a huge difference.
Or if you disconnect the TC control system plug. Again, at that point you now have a rear wheel drive Cayenne.
Where's the massive loss of power...... lost to?
Are your rear wheels spinning, like a smoking burnout?
Can the TC problems be described simply as
"a clutch slipping that results in loss of power to the front wheels of the AWD vehicle"?
Good question. No idea but the car is way slower. Feels like a manual transmission car with a worn out clutch. Gotta baby the gas pedal otherwise all you get are a bunch of RPM's and no movement.
Not an engineer/mechanic but if I had to guess, power actually flows like so: Engine >> Transmission >> Transfer case clutch packs >> power to rear/front. The clutches are worn and slip, loss of power all around.
Your theory is correct for 4WD and when the stepper motor is unplugged because then the TC defaults to 100% RWD (?) but with the transfer case "plugged in", it tries to do the 32/68 default F/R power split and all the power is lost in the slipping clutches.
Someone with more knowledge can hopefully chime in.
12-21-2020, 07:02 PM
#1124
Three Wheelin'
I'm wondering since Porsche has supposedly "fixed" the transfer case problem, what fluid are they recommending with the "new" boxes. I thought I read that they changed the the material of the clutch discs. Do they recommend a different fluid? Or is it business as usual?