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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 F25 (2011 - current)

X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 07-01-2013, 09:48 AM
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jpfrog80 jpfrog80 is offline
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Location: Dallas, TX
 
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Mein Auto: 2006 325i
Auto Start/Stop

I just picked up a 2014 X3 35i last Monday, 6/24. It's the wife's daily driver, so I didn't get to drive it much last week until Sunday, 6/30. When test driving before we bought it, I thought the auto start/stop feature was a pretty cool idea...shutting down the main power, and having the secondary power supply provide juice to the A/C, radio, etc. We test drove in the morning, though, when temps were relatively cool.

I live in Dallas, and it's hot this time of year. This became a problem when the car was trying to keep the A/C temp at the set level I had it on. The engine would literally would start/stop multiple times while sitting at the same traffic light.

Is this healthy for the engine? I can't imagine that it's any more fuel efficient than just leaving the engine running and turning off the auto start/stop option, which I finally did because it was starting to annoy me.

Anyone out there have thoughts or knowledge on this?
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  #2  
Old 07-01-2013, 09:57 AM
The X Men The X Men is offline
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Mein Auto: 2012 535xi 2013 X3 35i
When it really hot out, I usually disable the ASS. With ASS on, sometimes the AC cannot keep up with hot temp and it takes longer to cool down the car. The compressor is not on when ASS shut off the car, if the temp inside the car gets too hot, the ASS will turn the engine and the compressor back on. The restart from that is very rough and sometimes it startle me a bit. I have done test runs with ASS enable and disable for a few tank full, the difference in gas mileage is about 1 MPG with mostly city driving according to the trip computer.
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  #3  
Old 07-01-2013, 12:30 PM
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WHITEX WHITEX is offline
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GONE>>>Sold. One of the best rides I ever owned. My 1st BMW-2006 X3 3.0 White w/blk. Prem/Nav/Sirius/Servo/Heated seats,steering/Park Dist./Xenon/Privacy.I got the auto. trans. so my wife can drive it.
Our 2nd Bimmer2014 X3 i35 Alpine/Chestnut. Nav,Prem,Tech,Cold Weather, Shades. Got the Automatic cause we had no choice
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  #4  
Old 07-01-2013, 02:07 PM
Stitches Stitches is offline
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Location: Ohio
 
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Posts: 99
Mein Auto: 2014 X3
Auto Start/Stop

Please help me. I forget how to disable this most annoying feature.


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  #5  
Old 07-01-2013, 02:43 PM
The X Men The X Men is offline
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Quote:
Originally Posted by Stitches View Post
Please help me. I forget how to disable this most annoying feature.


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Push the button next to the start button.
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  #6  
Old 07-01-2013, 02:44 PM
Stitches Stitches is offline
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Quote:
Originally Posted by The X Men View Post
Push the button next to the start button.
Ahhhhh. Thank you.
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  #7  
Old 07-01-2013, 04:02 PM
carrix carrix is offline
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Auto Start/Stop

Can you set it to remember last setting on 2014? On 2013, you have to get dealership to do it.


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  #8  
Old 07-01-2013, 04:52 PM
ironfan ironfan is offline
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Mein Auto: X3 28i
It remembers the last setting by default on the 2014s.
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  #9  
Old 07-01-2013, 07:32 PM
carrix carrix is offline
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Auto Start/Stop

Cool, thanks.


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  #10  
Old 07-01-2013, 08:44 PM
Vortec4800 Vortec4800 is offline
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Mein Auto: 13 X3 35i MSport, 09 135i
That's strange, when it's hot out mine never activates in the first place, and if it does it stays off for a minute or two and once it starts to warm up a bit the engine starts up again and won't shut back off until after I've been moving. I'm surprised to hear yours turns on and off multiple times when sitting at the same light.

When it's cool out, I really like the auto start/stop. When the engine shuts off everything is so nice and quiet. I never disable it.
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  #11  
Old 07-01-2013, 09:01 PM
Lou r Pitcher Lou r Pitcher is offline
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Location: Texas
 
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Mein Auto: X3
Auto start stop found cycling on at a light to keep the AC temp in a range is being influenced by what the driving setting is .....Eco or comfort or sport.

In hot weather, I need to go to comfort if X3 is frequently stopped. and wife is in car wanting AC and engine to keep running constantly.

Last edited by Lou r Pitcher; 07-01-2013 at 09:03 PM.
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  #12  
Old 07-02-2013, 03:42 AM
poker838 poker838 is offline
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Mein Auto: F25 x28 n52 + n20 / B8 A4
I thought the a/c compressor was electrically driven, not hydraulic... I'm surprised that the motor has to be running to see it work
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  #13  
Old 07-02-2013, 07:07 AM
The X Men The X Men is offline
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Mein Auto: 2012 535xi 2013 X3 35i
Quote:
Originally Posted by poker838 View Post
I thought the a/c compressor was electrically driven, not hydraulic... I'm surprised that the motor has to be running to see it work
I think it is a electric compressor, but, unlike a hybrid, the battery is not big enough to run it for a long time.
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  #14  
Old 07-02-2013, 03:42 PM
roadkillrob roadkillrob is offline
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Mein Auto: 325CIC, 335CIC
Start Stop works like ASS, hence the name!
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  #15  
Old 07-06-2013, 08:57 PM
jeff_K jeff_K is offline
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Mein Auto: BMW X3 28i
According to my dealer here in HK, ASS is one of the many features that earn the X3 a certificate for Environment-friendly Petrol Private Cars and hence a tax concession. That was prior to 1 April 2013. The feature could be de-activated so I did not mind taking the X3 so as to benefit from the significant tax concession. Besides, the packages that came with the car exceeded my expectations.
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  #16  
Old 07-07-2013, 11:30 AM
BMWDude49120 BMWDude49120 is offline
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Mein Auto: 2014 X3 35i M Sport
Auto Start/Stop

Quote:
Originally Posted by The X Men View Post
I think it is a electric compressor, but, unlike a hybrid, the battery is not big enough to run it for a long time.
The compressor is belt driven from the running engine, not electrically driven. Go look under your good if you don't believe me. The AC compressor is right next to the air filter housing and is clearly belt driven.


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  #17  
Old 07-07-2013, 04:16 PM
The X Men The X Men is offline
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Mein Auto: 2012 535xi 2013 X3 35i
Quote:
Originally Posted by BMWDude49120 View Post
The compressor is belt driven from the running engine, not electrically driven. Go look under your good if you don't believe me. The AC compressor is right next to the air filter housing and is clearly belt driven.


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I believe you.
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  #18  
Old 07-11-2013, 03:06 PM
RRZ RRZ is offline
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Location: Lake Forest, IL
 
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Posts: 17
Mein Auto: X3
Code For Turning off Start Stop

My 2014 has auto start-stop to last used by default,

but whenever you turn on eco-pro mode (as compared to sport+, sport and comfort), the auto start-stop automatically turns back on and then I have to manually press the button to turn off auto start-stop again.

Is there a setting (or programmable code) that would prevent eco-pro from turning on the auto start-stop?
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