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  #1  
Old 11-16-2016, 07:56 AM
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Anyone noticed Their X5 has multiple personalities?

After quite a few years of owning this thing I have noticed this truck is quite temperamental. It has days where is roars to life full of zeal and ready to roll, other days it starts and just kinda moves and goes. There are some times when I am driving into work and think, what a nice day driving in. Pleasureable, the truck is responsive and peppy, then there are times when its just like a chore where its tired and wants to stay in bed. I don't know if its me or if its just gotten fussier in its old age.

I have never noticed this with the other BMW's I've owned, just this one. Even the 528....its just under 90k and been exactly the same since the day I bought it 5 years ago with 12k miles.
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2010 X5 3.0 X-drive Titanium Silver/Black
2018 Ford F-150 Platinum Crew
2010 528xi (His)
2017 M2 Manual (His)

Former Headaches:
2008 X5 RIP
2015 M235
2013 135is
2009 535xi Wagon (JUNK)
2007 530xi 6spd CPO Sport (Best Damn Car EVER)
2011 335xi M-sport Coupe 6spd (Sex on Wheels)
2010 550GT "CPO" (Junk)
2012 X5 35d "CPO" (More Junk)
2004 330i ZHP Sedan
2002 325xi Wagon
2000 323i Sedan
1998 M3 Sedan
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  #2  
Old 11-16-2016, 12:13 PM
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I was having similar issues for the past month or two - turns how my red boost hose clamp and come undo - fixed that and now it rips again.

Just a note made - check the red boost hose and look for vacuum line issues.
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  #3  
Old 11-16-2016, 01:05 PM
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Quote:
Originally Posted by captpilly View Post
I was having similar issues for the past month or two - turns how my red boost hose clamp and come undo - fixed that and now it rips again.

Just a note made - check the red boost hose and look for vacuum line issues.
did you get any codes while the hose was off?
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  #4  
Old 11-16-2016, 01:44 PM
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No codes - you can just feel the difference. Not as aggressive as the truck normally is
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  #5  
Old 11-17-2016, 08:33 AM
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I am not a twin turbo model. I am however searching for a vacuum leak.
__________________
2010 X5 3.0 X-drive Titanium Silver/Black
2018 Ford F-150 Platinum Crew
2010 528xi (His)
2017 M2 Manual (His)

Former Headaches:
2008 X5 RIP
2015 M235
2013 135is
2009 535xi Wagon (JUNK)
2007 530xi 6spd CPO Sport (Best Damn Car EVER)
2011 335xi M-sport Coupe 6spd (Sex on Wheels)
2010 550GT "CPO" (Junk)
2012 X5 35d "CPO" (More Junk)
2004 330i ZHP Sedan
2002 325xi Wagon
2000 323i Sedan
1998 M3 Sedan
1992 325i Sedan
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  #6  
Old 11-17-2016, 10:36 AM
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I find the automatic 4x4 system is one of several things that make performance and smoothness inconsistent. Each time you start your X5, the transfer case calibrates the clutches that send power to the front axle. In my opinion, the degree of lock up of the clutches varies each time you restart the vehicle. If the clutches lock up more than expected, the drive train will bind up a small amount which can add drag. The ECU senses this and then tells the engine to limit torque. If the clutches get bad enough, you actually will get jerking and rough shifts.

As a test disconnect your transfer case at the module. Pre LCI put this in the back by the battery. Remove the cover on your battery and you will see a silver box with ATC700 on it. Unplug and go for a drive. Be careful as stability control and ABS are disabled.
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  #7  
Old 11-22-2016, 11:57 AM
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Interesting. Is the clutch calibration the only 'electronic' function that the transfer case does? In other words,
Does disconnecting that module ONLY impact the clutch calibration and nothing else?
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  #8  
Old 11-22-2016, 12:26 PM
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Quote:
Originally Posted by heatmizr View Post
Interesting. Is the clutch calibration the only 'electronic' function that the transfer case does? In other words,
Does disconnecting that module ONLY impact the clutch calibration and nothing else?
I asked my dealer that very question and they were unsure of the answer. Disconnecting the transfer case also disables the stability control and ABS so there could be other affects.
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  #9  
Old 11-22-2016, 01:10 PM
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Quote:
Originally Posted by smassey321 View Post
I find the automatic 4x4 system is one of several things that make performance and smoothness inconsistent. Each time you start your X5, the transfer case calibrates the clutches that send power to the front axle. In my opinion, the degree of lock up of the clutches varies each time you restart the vehicle. If the clutches lock up more than expected, the drive train will bind up a small amount which can add drag. The ECU senses this and then tells the engine to limit torque. If the clutches get bad enough, you actually will get jerking and rough shifts.

As a test disconnect your transfer case at the module. Pre LCI put this in the back by the battery. Remove the cover on your battery and you will see a silver box with ATC700 on it. Unplug and go for a drive. Be careful as stability control and ABS are disabled.
If it is a Kia i may agree on this statement. But BMW must have more sophisticated system to do the calibration. Actually if the calibration is done once in a while such effect may occur, hence it is done at every start-up, to compensate for changing conditions. Also there is absolutely no reason for "binding" if ,let's say 10% of the torque is sent to the front wheels instead of 0%. This is not a low range system of diff locking. Also if the engine goes in a limp mode it will be a very noticeable reduction in the power, not a variation of the power.
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