Erratic acceleration hesitation/delay X3 30D 2012

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AdeOzzyT
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Posts: 4
Joined: 22 Oct 2016, 10:10
Car model: X3 30D F25 2012 M Sport
Location: Cheshire

Erratic acceleration hesitation/delay X3 30D 2012

Post by AdeOzzyT » 22 Oct 2016, 11:33

    Hi everyone, This is my first post and also third forum but still unlucky in finding help. From last 2 months I have a problem with my X3 30d F25 2012 with 77000 on the clock. Car is behaving very weirdly and the moment nobody can tell what is going on with it and I can't find anything online. Suspicions are that this is a Transfer case or transmission but nobody can tell at the moment. I will try to describe as best as I can. Car have a kinda of power hesitation or delay. It is happening most of the times but not all the time. No problems with start or idle at all. For example driving at any speed between 30-70miles/h on around 2000 revs trying to accelerate dynamically but what car does first is kinda dropping revs to let's say 1700 like car would decided to change gear to higher(today once did even down to 1500) and then the revs are going back up. Or for example there is a hesitation in general and most of the times whenever I want to accelerate fast from lower revs for example going on 1000 revs and press acceleration hard then car is moving but not much faster untill will hit turbo range and then pulling as it should. But this thing can happen on the higher revs too. I have been to BMW specialsists to BMW dealer, automatic transmission place and to the guy who does transfer cases only too. Car doesn't really make any suspicious noises. Things on the car done up to date. 1. EGR valve replaced (thrown code at BMW specialists and after replacing no more codes) 2. Change 4 tyres to Pirelli P Zero. For few weeks I was running on the rear with one new budget tyre and one P Zero with around 4mm tread) And 2 same new budget on the front. I have staggered wheels. 3. Changed fluid in the transfer case and reseted transmission. 4. Cleaned MAF No change at all. Next not too expensive step (Spent £1400 already) would it be doing transmission updates.
    Please follow the link to see video with the symptoms of revs dropping. You can see it twice starting at 11sec that after acceleration the revs are dropping from 1500 to about 1200 to go up again.
    https://1drv.ms/v/s!AlD-rEy1Em_lj0M0CoMdfEy9a-Fj" onclick="window.open(this.href);return false;
    Appreciate any advices or suggestions guys
    Thank you

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    M60NJP
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    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by M60NJP » 22 Oct 2016, 11:44

    I'm not quite understanding what happens!

    '....driving at any speed between 30-70miles/h on around 2000 revs trying to accelerate dynamically but what car does first is kinda dropping revs to let's say 1700 like car would decided to change gear to higher(today once did even down to 1500) and then the revs are going back up'

    So - regardless of road speed - at 2000 revs, when you try to accelerate the revs drop and then the car kicks down (to lower gear) or changes up (to higher gear). If this is correct, the gearbox seems to be doing what it should be and the issue is a fuelling one or TPS.

    Can you clarify the symptoms please?

    Maxwell
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    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by Maxwell » 22 Oct 2016, 11:45

    No advice just making your post more readable

    Hi everyone,

    This is my first post and also third forum but still unlucky in finding help. From last 2 months I have a problem with my X3 30d F25 2012 with 77000 on the clock. Car is behaving very weirdly and the moment nobody can tell what is going on with it and I can't find anything online.

    Suspicions are that this is a Transfer case or transmission but nobody can tell at the moment. I will try to describe as best as I can.

    Car have a kinda of power hesitation or delay. It is happening most of the times but not all the time. No problems with start or idle at all.

    For example driving at any speed between 30-70miles/h on around 2000 revs trying to accelerate dynamically but what car does first is kinda dropping revs to let's say 1700 like car would decided to change gear to higher(today once did even down to 1500) and then the revs are going back up.

    Or for example there is a hesitation in general and most of the times whenever I want to accelerate fast from lower revs for example going on 1000 revs and press acceleration hard then car is moving but not much faster untill will hit turbo range and then pulling as it should. But this thing can happen on the higher revs too.

    I have been to BMW specialsists to BMW dealer, automatic transmission place and to the guy who does transfer cases only too. Car doesn't really make any suspicious noises.

    Things on the car done up to date.

    1. EGR valve replaced (thrown code at BMW specialists and after replacing no more codes)
    2. Change 4 tyres to Pirelli P Zero. For few weeks I was running on the rear with one new budget tyre and one P Zero with around 4mm tread) And 2 same new budget on the front. I have staggered wheels.
    3. Changed fluid in the transfer case and reseted transmission.
    4. Cleaned MAF No change at all.
    Next not too expensive step (Spent £1400 already) would it be doing transmission updates.

    Please follow the link to see video with the symptoms of revs dropping. You can see it twice starting at 11sec that after acceleration the revs are dropping from 1500 to about 1200 to go up again.

    https://1drv.ms/v/s!AlD-rEy1Em_lj0M0CoMdfEy9a-Fj" onclick="window.open(this.href);return false;

    Appreciate any advices or suggestions guys

    Thank you

    AdeOzzyT
    BMW Enthusiast
    Posts: 4
    Joined: 22 Oct 2016, 10:10
    Car model: X3 30D F25 2012 M Sport
    Location: Cheshire

    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by AdeOzzyT » 22 Oct 2016, 17:31

    Thanks for the reply and sorry for the confusions.
    It isn't about a kickdown.
    If you will have a look at my video (starts at 11 sec) you can see it that revs are dropping from 1500 to about 1300. Sometimes even lower. It is happening after I press the acceleration. I have realized today that it doesn't have to be very dynamic acceleration. And also car have delay after hitting acceleration on mainly anywhere between around 1000-2000 revs.

    And generally trying to accelerate from 1000 revs is taking more time than it should.

    What I have also observed today (need to drive more to confirm) that when I have switched to sport mode response on lower revs was a bit better with delay still existing but I haven’t observed the revs dropping down. Probably because it was a sport mode.

    There is definitely something wrong with the car as wasn't behaving like this before.

    I was thinking about the TPS but unpligged today and had a drive but can't tell any difference.

    Someone suggest me doing some update in the gearbox mainly but I don't know of this would help.

    Hopefully this will clarify a bit.

    Thank you

    AdeOzzyT
    BMW Enthusiast
    Posts: 4
    Joined: 22 Oct 2016, 10:10
    Car model: X3 30D F25 2012 M Sport
    Location: Cheshire

    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by AdeOzzyT » 29 Oct 2016, 14:08

    Hiya,
    Today I found with Carly for BMW fault code 260F00 'throttle position sensor signal short circuit to positive'
    Does anyone knows guys what it exactly means? Is my throttle body faulty? Sensor is attached permanently on this model I think
    Thanks

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    M60NJP
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    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by M60NJP » 29 Oct 2016, 21:09

    AdeOzzyT wrote:Hiya,
    Today I found with Carly for BMW fault code 260F00 'throttle position sensor signal short circuit to positive'
    Does anyone knows guys what it exactly means? Is my throttle body faulty? Sensor is attached permanently on this model I think
    Thanks
    It most probably suggests a fault with the TPS which is integral as you rightly state.

    AdeOzzyT
    BMW Enthusiast
    Posts: 4
    Joined: 22 Oct 2016, 10:10
    Car model: X3 30D F25 2012 M Sport
    Location: Cheshire

    Re: Erratic acceleration hesitation/delay X3 30D 2012

    Post by AdeOzzyT » 02 Nov 2016, 20:41

    Thanks for the reply buddy.

    The TPS fault has gone and was probably because I have unplugged the sensor once.

    But one fault that is always coming back is:

    'Integrated Chassis Module / Längs+Querdynamik
    :Ldm function High Level Operational readiness Icm'
    Code: 4827BA
    I can't find anything online about this.

    I have sent the faults report to BMW dealer and that's their answer:

    'Them fault codes are for the ICM (integrated chassis management), which is basically airbag systems etc.

    There will be no electrical fault stored for this vehicle relating to the fault. The fault is caused by a mechanical defect inside the transfer box. This is causing it to engage and disengage the x-drive system incorrectly. There is no other rectification procedure for that vehicle, other than complete transfer box replacement.'

    Since day one they were saying that this is transfer case that is causimg a problems.

    I'm a bit lost now to be honest. I want to try to pull 'transfer case' fuse out to see as this will change anything while driving on RWD only. I'm not sure which fuse is it.

    If I could get proper diagnose regarding the transfer case I can get it repleced quite cheap with reconditioned one.

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