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X3 F25 (2011 - current)
The latest X3 brings added style and new features to the BMW's mid-sized SUV. Talk about the BMW F25 X3 with other X3 owners now!

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  #51  
Old 12-09-2013, 03:23 PM
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lbjgh lbjgh is offline
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Learn how to drive. Neutral is there for a reason. Troll.
Quote:
Originally Posted by consuelaramirez View Post
no it is he car not the driver. this is a case by case basis . educate yourself before you respond with an ignorant uneducated response
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  #52  
Old 12-09-2013, 06:27 PM
Anfänger Anfänger is offline
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Quote:
Originally Posted by consuelaramirez View Post
educate yourself before you respond with an ignorant uneducated response
I think this is grossly unfair to lbjgh, whose advice was obviously intended to be constructive. If any of us experience an unexpected acceleration, we would do well to follow lbjgh's recommendations.
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  #53  
Old 12-11-2013, 02:48 AM
German Steel German Steel is offline
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I have sudden acceleration in my 535xi

It happens just about every time I wear my work bootsn while driving my car.

Sudden acceleration is a problem with the BMW, regarding pedal placement.

There is no practical margin between the pedals, and with clunky, bulky shoes you easily can step on both pedals without realizing it. You don't drive a formula one car with clunky shoes either.

It took three sudden acceleration occurances while wearing my work boots for me to finally admit that my choice of driving shoes contributes to the problem.
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  #54  
Old 12-19-2013, 09:03 AM
BMWDude49120 BMWDude49120 is offline
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Quote:
Originally Posted by UncleJ View Post
Unintended acceleration can happen -- check the fairly recent Toyota Lexus problems, as well as the infamous Audi disasters of years ago. While some of this can be put down to driver error, or floormats, or thick soled shoes, others cannot and could laid at the door of the drive by wire systems. In any case it is a serious problem, one that should be reported.
In the cases of both the Audi and Toyota/Lexus "issues", no vehicle faults were ever discovered (although the floor mats were a problem in some of the Toyota/Lexus cases, but the vehicles themselves had no faults). Almost all cases of "unintended acceleration" have eventually been chalked up to operator error after a thorough investigation of the offending vehicles showed no problems.
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  #55  
Old 12-19-2013, 11:10 AM
The X Men The X Men is offline
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Quote:
Originally Posted by UncleJ View Post
Unintended acceleration can happen -- check the fairly recent Toyota Lexus problems, as well as the infamous Audi disasters of years ago. While some of this can be put down to driver error, or floormats, or thick soled shoes, others cannot and could laid at the door of the drive by wire systems. In any case it is a serious problem, one that should be reported.
The Audi 5000 did not have a drive by wire system.
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  #56  
Old 12-22-2013, 06:57 PM
Fjrmann Fjrmann is offline
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  #57  
Old 02-28-2014, 03:48 AM
Naishsr Naishsr is offline
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Well here are more incidents. I own a 2013 X3 with less than 2000 miles on the odometer. Once in October 2013 and once in February 2014, with the vehile at a stop, the vehicle accelerated and hard braking did not stop immediaetly. The vehicle was at the dealer for a week the first time: they could not duplicate. It is now again at the dealer for 4 weeks. BMW USA is evaluating the vehicle, they claim engineers are looking at data collected. Now for all you experts that like to respond with stupid comments. Not everyone can go through a check list in their mind in seconds when they are accelerated forward from a stop and are more concerned with hitting another vehicle or person and thier eyes are scanning the area in front of them and not looking for buttons to stop! Most serious recalls are due to drivers that have experienced a problem and in some cases lost thier life. And it usually is always after someone has been killed that the NHTSA and the manufacture take it serious. BMWs are designed by humans and humans make errors.
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  #58  
Old 02-28-2014, 06:24 AM
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Drewsky Drewsky is offline
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Originally Posted by Naishsr View Post
Not everyone can go through a check list in their mind in seconds when they are accelerated forward from a stop and are more concerned with hitting another vehicle or person and thier eyes are scanning the area in front of them and not looking for buttons to stop!
Sorry but you are wrong there. Any person getting behind the wheel of any vehicle should know how to fully control the vehicle. I know, almost as a matter of reflex, that if my car makes like it is a rocket and starts going without my input, that I will shove the gearshift up (throwing it to neutral) and/or mashing the stop/start button. Both of those actions are designed as overrides to anything the car may be up to. Know them. Use them.


Quote:
Originally Posted by Naishsr View Post
BMWs are designed by humans and humans make errors.
Yes, but many people forget that the human is still the driver controlling the machine, not the other way around.
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  #59  
Old 02-28-2014, 08:02 AM
Naishsr Naishsr is offline
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Make pretend world

Not everyone is as smart and quick on their actions like you. Maybe you should be a rocket scientist or brain surgeon!

The reality is that we are human, we drive 3000 lb vehicles and theses vehicles are to be predictable and not take off on their own.
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  #60  
Old 02-28-2014, 12:08 PM
The X Men The X Men is offline
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Quote:
Originally Posted by Naishsr View Post
Not everyone is as smart and quick on their actions like you. Maybe you should be a rocket scientist or brain surgeon!

The reality is that we are human, we drive 3000 lb vehicles and theses vehicles are to be predictable and not take off on their own.
Did your rpm increase as you step on the brakes harder?
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  #61  
Old 02-28-2014, 01:03 PM
Naishsr Naishsr is offline
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Yes. The vehicle just started to move. It was not fast acceleration, just a gradual movement. Brakes pushed hard.
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  #62  
Old 02-28-2014, 01:40 PM
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hmm,
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  #63  
Old 02-28-2014, 02:08 PM
Naishsr Naishsr is offline
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This is not the situation. The vehicle is at a stop, no motion. Then it starts to move. Pressing the brakes does nothing. After about 10 to 20 feet it then stops. If I was rolling down the highway and I felt the car accelerate I think I would be able to put the vehicle in neutral and even engage the parking brake. But just sitting at a light and stop sign and it starts to move it is unexpected. Besides, all this is not relevant. The car should not accelerate unless I press on the accelerator! I am thinking software. I am assuming that BMWs have all sorts of code written into their operating system, someone at BMW wrote some bad lines of code?
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  #64  
Old 02-28-2014, 03:13 PM
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lbjgh lbjgh is offline
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My point of posting the video is at 60mph the car has a lot of kinetic energy at rest it has zero.

The brakes are able to overcome the kinetic energy at 60 therefore the brakes can overcome full thottle from rest even if a computer malfunction calls for maximum throttle.

I suggest it's more likely driver error than a brake malfunction.
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  #65  
Old 02-28-2014, 03:25 PM
Naishsr Naishsr is offline
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I can understand your opinion. But unless you were the person in the drivers seat, it is only your opinion. It is almost impossible for the driver to hit the accelerator at a dead stop unless your foot slipped off the brake! I think then you would realize you caused the acceleration. I also own a Tacoma and have never had experienced this. This Beamer is history as soon as I get it back. This is my third BMW that I have owned and I am about 100% sure it is the last. But I will wait for the BMW engineers to provide their full analysis. I expect it on Monday or Tuesday.
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  #66  
Old 03-01-2014, 02:25 AM
master2301 master2301 is offline
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Quote:
Originally Posted by knoxvolgirl View Post
I just purchased a beautiful 2013 silver x3 35i m sport last weekend. It's gorgeous. It now has about 140 miles on it. Twice when breaking slowly (in a parting lot) to stop, the car/engine has continued to try to accelerate. To the point I was basically standing on the break and it was still creeping forward. The first time, to avoid crashing into the building in front to me, I punched the start/stop button to turn the car off. The second time, the car moved forward to where I had to pull into traffic quite dangerously. The floor mat was not obstructing the gas pedal etc. so that's not an issue. The dealer now has it back to investigate. Any thoughts? Never experienced anything like this before. Thanks.
I wonder if it was possible for the recall for 2012-14 BMW X3 Models with 28i engine for loss of brake power to also be associated with the 35i engine as well?T

The Problem:
The oil supply from the intake camshaft to the brake vacuum pump can become restricted. If this happens the brake vacuum pump could fail due to lack of lubrication, resulting in a loss of power brake assist.

The hydraulic brakes will still function to stop the vehicle but without power assist. Without assist the driver will need to apply much greater pedal pressure to stop the vehicle. The distance required to stop the vehicle will increase as most drivers will not be able to apply enough brake pedal pressure.

Last edited by master2301; 03-01-2014 at 02:28 AM. Reason: add information
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  #67  
Old 03-01-2014, 07:05 AM
The X Men The X Men is offline
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Quote:
Originally Posted by Naishsr View Post
Yes. The vehicle just started to move. It was not fast acceleration, just a gradual movement. Brakes pushed hard.
Naishsr, did you lose power brake assist?
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  #68  
Old 03-01-2014, 09:37 AM
gregwym gregwym is offline
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Quote:
Originally Posted by master2301 View Post
I wonder if it was possible for the recall for 2012-14 BMW X3 Models with 28i engine for loss of brake power to also be associated with the 35i engine as well?T

The Problem:
The oil supply from the intake camshaft to the brake vacuum pump can become restricted. If this happens the brake vacuum pump could fail due to lack of lubrication, resulting in a loss of power brake assist.

The hydraulic brakes will still function to stop the vehicle but without power assist. Without assist the driver will need to apply much greater pedal pressure to stop the vehicle. The distance required to stop the vehicle will increase as most drivers will not be able to apply enough brake pedal pressure.
I would think this is the cause. Just get the car to the dealer and let them check this particular issue.
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  #69  
Old 02-20-2015, 08:40 AM
Paul from S.FL Paul from S.FL is offline
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Brake pedal pressure causes engine racing

I have found this site very helpful. Yesterday and today I found that when Stepping on the brake the engine accelerated. The harder I stepped on it, the more it accelerated. Nothing seemed to change it. Called the BMW service center and they thought it could be an air leak in the brake system???

Found this website and read some of the comments on the problem I was experiencing. I noted some had indicated that a wider shoe sole might catch both pedals and went back to check it out. Then I saw the problem, my black Z4 floor mat (on a black carpet) which is hard to see in a dim light had slid forward, crumpled up and was jammed under the brake and on top of the gas pedal. It was stiff enough to press the gas when stepping on the pedal. Straightened out the mat - problem solved. Probably saving more than a couple hundred bucks. Wearing a strong gripping running shoe makes it easy to unintentionally dislodge the mat from the Velcro holders.

Called back the BMW service center who couldn't believe it was so simple. BTW, it was a BMW standard Z4 mat, not 3rd party. Don't know if this answers everyone's problem but it answered mine and restored my confidence in the Z4 design.
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  #70  
Old 02-20-2015, 01:25 PM
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Tangent Tangent is online now
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Quote:
Originally Posted by Paul from S.FL View Post
I have found this site very helpful. Yesterday and today I found that when Stepping on the brake the engine accelerated. The harder I stepped on it, the more it accelerated. Nothing seemed to change it. Called the BMW service center and they thought it could be an air leak in the brake system???

Found this website and read some of the comments on the problem I was experiencing. I noted some had indicated that a wider shoe sole might catch both pedals and went back to check it out. Then I saw the problem, my black Z4 floor mat (on a black carpet) which is hard to see in a dim light had slid forward, crumpled up and was jammed under the brake and on top of the gas pedal. It was stiff enough to press the gas when stepping on the pedal. Straightened out the mat - problem solved. Probably saving more than a couple hundred bucks. Wearing a strong gripping running shoe makes it easy to unintentionally dislodge the mat from the Velcro holders.

Called back the BMW service center who couldn't believe it was so simple. BTW, it was a BMW standard Z4 mat, not 3rd party. Don't know if this answers everyone's problem but it answered mine and restored my confidence in the Z4 design.
Your situation and having your foot pressing both the brake and gas simultaneously are probably by far the most common reasons that people experience unintended acceleration. You seem to be rather a rarity in that you investigated the issue and found a cause instead of immediately blaming the car and not even considering that you might have done something yourself though. Seriously, it's nice to see someone not stubbornly blaming the car for the problem. Or copping an attitude about legitimate suggestions because their pharmacy training made them too smart to be wrong about cars somehow...

Your experience with the floormats is also why any time you go to a trackday or autocross event you are required to remove them. Entering a corner at really high speed is just about the last place you'll want to have something pressing on the gas when you aren't expecting it.

I've only driven one car where it would be completely impossible to press the gas and brake at the same time accidentally, and that was a NASCAR. It had the clutch and brake far left, and the gas far right to make left foot braking easier. In every other car it's possible to one degree or another because the alternative is to space them uncomfortably apart and have people get off the gas and miss the brake pedal entirely. If the revs rise the harder you press on the gas, 99.9999% both pedals are being pressed!

Last edited by Tangent; 02-20-2015 at 01:26 PM.
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  #71  
Old 02-20-2015, 03:04 PM
BobBass BobBass is offline
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Paul,

All due respect, but...are you unaware of the problems Toyota has had with improper or improperly placed floor mats?

I like to save $ as much as the next guy, but you MUST use floor mats specifically designed for a vehicle. You also should not place floormats on top of other floormats.

OEM or OEM accessory floor mats usually have anchors that attach to the carpet (with lugs or Velcro) on the driver's side to ensure they don't shift and they are cut to not interfere with pedal operation.

I always get the "Weathertech Floor LINERS" because they not only do a superior job keeping dirt off the carpet, they are measured for fit by a laser system, anchored, and very thin. NO WAY can they have any "interaction" with the pedals.

I will also opine that there have been a couple of instances where my double-wide size 12 shoe has contacted both the brake and accelerator pedal when I had to do a "quick stab" at the brakes. This is my first BMW and maybe it's just due to pedal placement. It also seems to me that my '15 X3 requires more brake pedal "travel" than any vehicles I've driven. This also means I'm more likely to be closer to touching the accelerator pedal in a "hard stop." I mentioned this in my "J.D. Power" IQ survey.
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  #72  
Old 02-20-2015, 09:03 PM
bimmernut1 bimmernut1 is offline
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Quote:
Originally Posted by Paul from S.FL View Post
I have found this site very helpful. Yesterday and today I found that when Stepping on the brake the engine accelerated. The harder I stepped on it, the more it accelerated. Nothing seemed to change it. Called the BMW service center and they thought it could be an air leak in the brake system???

Found this website and read some of the comments on the problem I was experiencing. I noted some had indicated that a wider shoe sole might catch both pedals and went back to check it out. Then I saw the problem, my black Z4 floor mat (on a black carpet) which is hard to see in a dim light had slid forward, crumpled up and was jammed under the brake and on top of the gas pedal. It was stiff enough to press the gas when stepping on the pedal. Straightened out the mat - problem solved. Probably saving more than a couple hundred bucks. Wearing a strong gripping running shoe makes it easy to unintentionally dislodge the mat from the Velcro holders.

Called back the BMW service center who couldn't believe it was so simple. BTW, it was a BMW standard Z4 mat, not 3rd party. Don't know if this answers everyone's problem but it answered mine and restored my confidence in the Z4 design.
Great job of diagnosing your problem. It answers two questions I had, how can two unrelated systems; braking and accelerator be affected at the same time. You've answered it; common mode failure. The same floor mat that limited travel and prevented your brake from engaging fully simultaneously pressed down on the accelerator. I know it's not unusual for brakes to be able to apply four times the equivalent horsepower as an engine. That's why I didn't understand how a car could move forward even with full throttle applied if the brakes are fully engaged.

thanks for the post
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  #73  
Old 03-01-2015, 04:01 PM
zlinda zlinda is offline
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Wow. My 2013 X6 does just that. When you take your foot off the brake after starting the car it will leap/lurch forward. When I put my foot back on the brake the car will continue to pull forward and die or if I'm not afraid of hitting anything just let it go until it smooths out then proceed. It's scary and real. It is not driver error.
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  #74  
Old 03-01-2015, 09:03 PM
maverick2015 maverick2015 is offline
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Happened to me this weekend. Had no idea what was going on or causing it. Engine accelerated from idle towards 3k rpm. Foot on brake while rpm climbing. I immediately checked my foot, floor mat, and my surroundings. It was unsettling at the least. I noticed it because of the engine noise and obviously knowing I was not causing the car to accelerate, foot on the gas, or going down a decline. A real head scratcher. Occurred over about a 5 second period.
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  #75  
Old 03-02-2015, 07:49 AM
zlinda zlinda is offline
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I know I'm not the only one who has experienced this now that I have read through these and other posts. It is unfortunate that the SA said he believes this is how the car was engineered and that it is "normal". It has been reviewed by the Regional BMW representative twice and still nothing found wrong.

If a car lurching/hopping forward is "normal" and I've had it in for every test possible and had multiple parts replaced, reprogrammed, etc. and the problem is still there, am I supposed to accept it and just take it as part of owning the car? If so, Is that a reasonable request? What options do I have?
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