Hard Cold Shifts 6HP 26Z 04 4.4

[Fatcat]

I've been experiencing hard shifts especially when the car is cold. This isn't anything new to me but I just wanted to see if anyone has a better way to deal with this small problem.

I know it's inevitable not to have transmission problems, especially with an aging BMW with over 130k miles but how do you guys deal with this? I usually drive slow until my transmission warms up.

I know you can reset your transmission by holding your pedal past kickdown in switch 2 but how much of a difference does this make? also, would this reset be better with a warm or cold transmission or does it not make a difference?

I can deal with cold delayed and hard shifts but what really concerns me is when I slow down at a stop sign and drive forward and my transmission just takes a huge fucking dump feeling like a semi truck rear ended me. it's much worse uphill since there's more stress on the transmission so I avoid this by using manual mode.

The only two fixes I can think of are doing the kickdown transmission reset or buying SP-DATENS, or just dealing with it.

[wpoll]

Originally Posted by Fatcat

I know you can reset your transmission by holding your pedal past kickdown in switch 2 ...

Urban myth - this doesn't do anything (permanent).

The only way to reset the transmission adaptations is to use a diag. tool plugged into the diag. port (INPA/DIS/ISTA/Fowell etc.). and you would only do this if you have replaced transmission components.

It seems the only real hard fix for the dreaded 2-1 slam is to replace the solenoids on the valve body. Other fixes may reduce or eliminate the 2-1 slam for a time but it always comes back (DAMHIK...).

Some folk have also had success with a trans controller (EGS) software re-flash but others have done this with zero change.

Transmission threads are like oil threads - everybody will have a different opinion/experiance!

[EODguy]

Originally Posted by wpoll

Urban myth - this doesn't do anything (permanent).



The only way to reset the transmission adaptations is to use a diag. tool plugged into the diag. port (INPA/DIS/ISTA/Fowell etc.). and you would only do this if you have replaced transmission components.



It seems the only real hard fix for the dreaded 2-1 slam is to replace the solenoids on the valve body. Other fixes may reduce or eliminate the 2-1 slam for a time but it always comes back (DAMHIK...).



Some folk have also had success with a trans controller (EGS) software re-flash but others have done this with zero change.



Transmission threads are like oil threads - everybody will have a different opinion/experiance!

wpoll, I thought you were going to use the stiffening plate bolts as an example....

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[Themoog]

Get a trans service done and chuck a bit of Dr Tranny in that will fix it.

[haigha]

Another thing to check is the fluid level. I started having hard shifts when my level was low due to a leaking mechatronic sleeve. As the sleeve gets old the o-rings on it flatten out.

The first time a regular transmission service did the trick.

Then we did the solenoids and the seals above the valve body about four years later when the shifts got worse. Mine is an 04 4.4i N62 with only 47k miles.

Some useful info in the thread I created for the second iteration here:

https://xoutpost.com/bmw-sav-forums/...ent-notes.html

[Fatcat]

Originally Posted by haigha

Another thing to check is the fluid level. I started having hard shifts when my level was low due to a leaking mechatronic sleeve. As the sleeve gets old the o-rings on it flatten out.

How noticeable was the leak? would it stain the floor or was a closer inspection needed?