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  #1  
Old 10-19-2019, 02:16 PM
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Unhappy advice on gear down shift

hi all

just wondering really

not had the X5 long but anyway here goes

In D Auto when driving and then slowing down to a stop , i feel the gear change going in to first gear very noticeable ? it,s that noticeable it feels like its going to stall the engine !

i know she,s an old girl but thought i,ll ask if anyone getting the same

thanks in advance
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  #2  
Old 10-19-2019, 02:30 PM
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If you are referring to what is known as the the 2-1 slam (feels like you've been rear-ended!) then you have what is a common issue with the ZF transmission in these cars.

If you see the revs dip and don't feel a slam then perhaps it's something else...

The slam is caused by a number of factors - most likely failing mechatronic solenoids and/or mechatronic seals in the transmission in cars as old as ours.

The fixes vary - some folk try fluid changes but this can make things worse. A full mechatronic rebuild will often sort it (along with fresh fluid and new mechatronic seal).

I have minimized my symptoms by modifying my driving so that I don't let the transmission do it. I also changed the transfer case fluid and reset the transfer case oil wear adaptations (as per the manual) and was perplexed to discover that this maint. procedure reduced the transmission 2-1 slam enormously!! I occasionly get a tiny nudge but the slams are pretty much gone.
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Old 10-19-2019, 03:43 PM
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ok thanks
easy anough job
i,ll get that sorted after xmas

Last edited by ad01; 10-19-2019 at 04:06 PM.
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Old 10-19-2019, 04:10 PM
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Quote:
Originally Posted by wpoll View Post

<snip>
I also changed the transfer case fluid and reset the transfer case oil wear adaptations (as per the manual) and was perplexed to discover that this maint. procedure reduced the transmission 2-1 slam enormously!! I occasionly get a tiny nudge but the slams are pretty much gone.
Interesting point there, thanks. Didn't realize transfer case oil change would have such a dramatic improvement. Not that I have any problems, but it's been several years since I last changed the oil. Probably should do it soon just to keep the X happy.
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Old 10-19-2019, 07:11 PM
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Originally Posted by X5only View Post
Interesting point there, thanks. Didn't realize transfer case oil change would have such a dramatic improvement. ...
Yeah, dunno - I have no theory as to why - I'm just please with the result. It wasn't intended but VERY welcome!
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Old 10-20-2019, 07:49 AM
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what if i get a used perfect gearbox and swap it

would i need to code it ?
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Old 10-20-2019, 08:36 PM
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Originally Posted by ad01 View Post
what if i get a used perfect gearbox and swap it

would i need to code it ?
No coding as such but you would want to clear the EGS adaptations etc.

If your current gearbox is OK bar the small issue, then why don't you resolve that - it will be cheaper and then you have a known-good gearbox. Getting another used gearbox is a BIG unknown, unless it has already been fully rebuilt. You could easily end up with two faulty gearboxes instead of one good one.

There's a forum member here that is in this exact boat - he now has three faulty gearboxes....
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Old 10-20-2019, 09:18 PM
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One of the best transmission specialists I have ever seen on here is RRPhil and is located on your side of the pond in Blackburn, UK. I know that's where my gearbox would go if I lived over there.

https://xoutpost.com/bmw-sav-forums/...-teardown.html
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Old 10-21-2019, 04:25 AM
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A full mechatronic rebuild is what i,m going to do , as well as new seals rubber tubes x4 and fluid . will i need to code when done ?
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Old 10-21-2019, 04:32 AM
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Originally Posted by ad01 View Post
A full mechatronic rebuild is what i,m going to do , as well as new seals rubber tubes x4 and fluid . will i need to code when done ?
No re-code. The EGS isn't touched for this work - it's what would need coding (if any was required).

You would need to reset the EGS adaptations though - you'll need a proper scanner or BMW tools for this.
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