[testdriver]

The transmission on my 330i is having some strange problem every time when I come to a stop.....

When I'm about to stop the car (on D drive), I can feel a "push/ jumping" from the tranny when its downshift back to 1st and the whole car is "jumping" forward.


I did the following test and determine the problem is on 2nd to 1st gear:

>> when I drive on M mode, the car can stop smoothly and the gear will stay on M2 at complete stop.... once I switch from M2 to M1 manually (with brake apply) car "jump forward"

>> car stop at M2.... switching from M2 back to D.... "jump" occur

Does anyone know what happen to it and what is the solution to fix this..... is it a hardware or software problem ?

Right now I try to avoid the Jumping by push to N right before stop or keep driving on M2 so the tranny wont go back to 1st on its own.


Thank you and please offer advise...


car info: 2007 330i / 43000km / change tranny oil 4 month ago but without changing the Pan/filter

[NBK]

and thats why i dont change tranny fluid.

[Johnny D]

Sometimes I can feel my torque converter unlock when Im slowing down, but Ive never had the car "jump". I cant help you on this one, my only suggestion would be take it in and get it checked out.

[FrankE90xi]

My car does this too 07 328 xi idk what it is one time the code came up for a shift solenoid but I've never seen it since

[testdriver]

Originally Posted by NBK

and thats why i dont change tranny fluid.

I hope that is not related.... I changed my tranny fluid like 4 months ago, everything is running fine until 3 weeks ago.

[testdriver]

Originally Posted by jntar

Sometimes I can feel my torque converter unlock when Im slowing down, but Ive never had the car "jump". I cant help you on this one, my only suggestion would be take it in and get it checked out.

Some shop tell me to change the fluid + oil pan filter but I'm not too sure will that work. Also no code has ever appear so they may not found anything.

[NBK]

Originally Posted by testdriver

I hope that is not related.... I changed my tranny fluid like 4 months ago, everything is running fine until 3 weeks ago.

all it takes is for one small particle to come free when changing fluid- and resting in a place it shouldn't be.

thats my take on AT transmissions at least.....

[testdriver]

Originally Posted by FrankE90xi

My car does this too 07 328 xi idk what it is one time the code came up for a shift solenoid but I've never seen it since

No code on my case...

[Cisco661]

how many miles did you have on car when you changed tranny fluid?

[testdriver]

Originally Posted by Cisco661

how many miles did you have on car when you changed tranny fluid?

around 39500 KM (4 months ago), right now is ~43000KM.

[mike-y]

why would you change the trans fluid on the automatic at 39km? The auto trans is supposed to go around 100k miles (160,000km) without needing service. Some people do it around 80k miles, but 39,000km is way too early.

[Bavarian Tech]

Originally Posted by mike-y

why would you change the trans fluid on the automatic at 39km? The auto trans is supposed to go around 100k miles (160,000km) without needing service. Some people do it around 80k miles, but 39,000km is way too early.

Not necessarily, ask any old timer..they'll say around 30k...or earlier..Yes BMW quotes the tranny fluid is good till 100k too but that's also when any of their warranties expire also.(No it wont blow up @ 100,001) but A few hundred dollars over the life time of the car is still alot cheaper than a $5,000 transmission.. IMO

OP, Do you have access to a Scan tool ?

[tc328]

you cant mix old ATF with new, unless you flush within days

you need to flush your ATF again asap, and change your pan/filter

REMEMBER TO USE OEM ATF...No redline, motual, r purple if you want to save your tranny

[testdriver]

Originally Posted by Bavarian Tech

Not necessarily, ask any old timer..they'll say around 30k...or earlier..Yes BMW quotes the tranny fluid is good till 100k too but that's also when any of their warranties expire also.(No it wont blow up @ 100,001) but A few hundred dollars over the life time of the car is still alot cheaper than a $5,000 transmission.. IMO

OP, Do you have access to a Scan tool ?

I can find a shop which has it but no code ever appear so I'm not sure will that help...... but I will try.

[testdriver]

Originally Posted by tc328

you cant mix old ATF with new, unless you flush within days

you need to flush your ATF again asap, and change your pan/filter

REMEMBER TO USE OEM ATF...No redline, motual, r purple if you want to save your tranny

Not too sure did the shop drain out all the fluid 100% completely but even if there's old ATF there it should be not be a lot left...... may I ask why can't mix old ATF with new?? what is the reason behind it? thanks

btw.... I did use OEM ATF but did not change my AT pan/filter last time.

[Bavarian Tech]

Originally Posted by testdriver

I can find a shop which has it but no code ever appear so I'm not sure will that help...... but I will try.

Look around on the forum, maybe theirs someone in your area to help ya out..Might help by just doing adaptation reset.

Originally Posted by testdriver

Not too sure did the shop drain out all the fluid 100% completely but even if there's old ATF there it should be not be a lot left...... may I ask why can't mix old ATF with new?? what is the reason behind it? thanks

btw.... I did use OEM ATF but did not change my AT pan/filter last time.

You really cant drain all the fluid out an automatic trans..(Torque converter, valve body,pump...all hold fluid) Mixing old n new fluid is going to happen regardless..Same thing as an oil change..you never get it all out..

[ska325xi]

you never get it all out but flushing it then a pan/filter change can at least get you 85% new fluid. the torque converter and other listed can hold up to 3-4 qts. if you dont flush it then dont touch it at all

[testdriver]

Originally Posted by Bavarian Tech

Look around on the forum, maybe theirs someone in your area to help ya out..Might help by just doing adaptation reset.

I actually has a "feeling" this could be a software problem regarding than hardware.... may I ask what is " adaptation reset" ?

I try to figure out is it possible for me to reset my tranny ecu and make it learn how to drive again....


I agree with you that unless it is a brand new tranny... there's no way one can drain out all the ATF.... anyway, a shop did tell me to change the ATF with oil pan/ filter to see if it can fix the problem. I'm not too sure will that work.

Thanks again...

[testdriver]

Originally Posted by ska325xi

you never get it all out but flushing it then a pan/filter change can at least get you 85% new fluid. the torque converter and other listed can hold up to 3-4 qts. if you dont flush it then dont touch it at all

I understand what you meant... and more than one person has said do not mix old ATF with new. My question is if this is a big no no..... then why would my tranny doing fine after the ATF changed and the problem occur 5 months later (3000km) ?

thanks....

[ska325xi]

things doesnt break down right away, 1 tiny particle can cause your tranny to slip, its a chain rection....heat will start to generate more and more over time

stop wasting time, i also recommend a pan filter change but it might be too late

[nirgutman]

Hi Testdriver,

I've been searching every website to see if anyone else had this problem. My 328i sport does the same exact thing ! It kicks/jumps right as i slow down to the 10mph mark. Every time, I took it to the dealer and drove with a mechanic. It stopped doing it right then and there. As soon as I left the lot it returned and has gotten really bad, sometimes the whole car shakes.

Have you figured out what it is yet? It's driving me crazy.

[evssss1]

Same symptom in my 05 325i. Try resetting the adaptation in INPA which will help. But it is just a matter of time this weird jump is coming back and then another reset will help for a period.

Let me know if changing ATF will oil pan helps.....