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#1
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advice on gear down shift
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
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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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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#3
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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. |
#4
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Quote:
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
#5
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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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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#6
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what if i get a used perfect gearbox and swap it
would i need to code it ? |
#7
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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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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#8
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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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Digital Competition Systems The older I get... The faster I was... No Fear |
#9
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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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#10
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Quote:
You would need to reset the EGS adaptations though - you'll need a proper scanner or BMW tools for this.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
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