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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-08-2012, 08:49 AM
naseeb naseeb is offline
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Location: San Diego
 
Join Date: Oct 2012
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Mein Auto: E39
'01 E39 Auto Transmission "Jerky" downshift

Just had the transmission serviced. However, it continues to have "Jerky" downshift while slowing down. Has anyone encountered this situation, and any ideas on how this might be fixed.

Thanks!
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  #2  
Old 10-08-2012, 09:49 AM
e39540iv8 e39540iv8 is offline
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Location: Australia
 
Join Date: May 2012
Posts: 141
Mein Auto: 2000 BMW 540iA
Transmission mounts or motor mounts, check them if you haven't already.
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  #3  
Old 10-09-2012, 09:53 AM
BadBrad BadBrad is offline
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Location: Massachusetts
 
Join Date: Oct 2008
Posts: 228
Mein Auto: 2003 540iA M-Sport
Very common problem for our cars. One simple solution is to run your car with the gear shift in "Sport" mode. This forces the transmission to downshift a little earlier (higher RPM) when coming to a stop avoiding that jerkiness when downshifting to 1st. Another option is to have the dealer raise the idle speed about 100 rpm. Many forum members have had success with that method also.

The underlining problem is that the transmission control valve assemble contains a lot of small o-rings, solenoid valves and hydraulic ports that accumulate wear deposits (In spite of the filter) that hinder the smooth operation when like new. This coupled with the relatively low idle RPM causes the abrupt shifting when coming to a stop. Nothing short of rebuilding the valve assembly will totally cure the situation.

BTW, in Europe, ZF Transmissions offers this rebuild service for about $500 as they consider it part of the required maintenance. They recommend that it be done every 60-70,000 miles. By all accounts it is well worth it.
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Last edited by BadBrad; 10-09-2012 at 09:56 AM.
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  #4  
Old 10-09-2012, 10:41 AM
4given 4given is offline
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Location: Carlisle,PA.
 
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Mein Auto: 1999 BMW 540i auto
I had the same problem and it helped when I unplugged the battery for about 10 mins and drove it in sport mode for 2 weeks. Sounds weird but its been a couple of months and it hasn't done it yet.
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  #5  
Old 10-09-2012, 11:51 AM
champaign777's Avatar
champaign777 champaign777 is offline
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Mein Auto: 2003 530 Sport Twins
Quote:
Originally Posted by 4given View Post
I had the same problem and it helped when I unplugged the battery for about 10 mins and drove it in sport mode for 2 weeks. Sounds weird but its been a couple of months and it hasn't done it yet.
bingo
this is because you cleaned transmission settings
The new here is you said you drove it in a sport mode for 2 weeks
2 weeks is the time when a new setting applied

REALLY INTERESTING
I NEED TO TRY SIR
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Last edited by champaign777; 10-12-2012 at 04:46 PM.
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  #6  
Old 10-09-2012, 06:58 PM
josemedeiros007 josemedeiros007 is offline
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Location: San Jose, California
 
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Mein Auto: 1998 528i 4Dr
Can I ask by what you mean to having your transmission serviced? Did you replace the Transmission Filter and use a Synthetic Transmission Fluid?
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