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-   -   advice on gear down shift (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/110942-advice-gear-down-shift.html)

ad01 10-19-2019 02:16 PM

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 !:confused:

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

thanks in advance

wpoll 10-19-2019 02:30 PM

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. :rolleyes:

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. :dunno:

ad01 10-19-2019 03:43 PM

ok thanks
easy anough job
i,ll get that sorted after xmas

X5only 10-19-2019 04:10 PM

Quote:

Originally Posted by wpoll (Post 1170236)

<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. :dunno:

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.

wpoll 10-19-2019 07:11 PM

Quote:

Originally Posted by X5only (Post 1170240)
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! ;)

ad01 10-20-2019 07:49 AM

what if i get a used perfect gearbox and swap it

would i need to code it ?

wpoll 10-20-2019 08:36 PM

Quote:

Originally Posted by ad01 (Post 1170263)
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. :confused:

There's a forum member here that is in this exact boat - he now has three faulty gearboxes.... :(

Overboost 10-20-2019 09:18 PM

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

ad01 10-21-2019 04:25 AM

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 ?

wpoll 10-21-2019 04:32 AM

Quote:

Originally Posted by ad01 (Post 1170291)
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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