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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 05-13-2011, 11:33 PM
skittso skittso is offline
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Location: Perth, Australia
 
Join Date: Mar 2011
Posts: 36
Mein Auto: BMW 735i E65 2003
Transmission Problems Fixed

I noticed a large amount of threads on problems with tranmissions on these 7's

I thought I might start a thread were we could put down problems we have had with our transmissions and what fixed them.

When I purchased my 735i, 6 months ago it had the usual slam back into 1st.
After visiting the BMW dealer a few times reprogamming, resetting adaptions, changing oils and filter. Was better but still came into 1st badly. Even to the point at one time I swear the back axle was being torn out. They told me it needed a new transmission $10,000.
Went to ZF transmission specialist he rebuilt the Mechatronix on the tranny. It changed up and down smoother but still slamed now and then. I took it back.
I had a large discussion with him about these boxes.

He told me:-

They are very complicated piece of machinery. He went on to say the gearbox itself are fairly bulletproof. You will have very few problems with this section of the box. Providing you change the oil regularly. About every 60,000 to 80,000 kms. The oil level is also critical to be at the right level. Mine had done 138,000kms and inside was like brand new. Most of the problems are with the mechatronix as it is full of ceramic seals and sensors that use hydraulic pressure to change gears. As time goes by these seals absorb oil, wear slightly and sensor become less sensitive not allowing the right amount of pressure for changing gears.
I also read on hear somewere that they have a very complicated electronics system. When we let our foot of the pedal to slow down that these gearboxes are pre-empting what we are going to do. They have 3 different programmes of changing down gears so as to assist slowing the car down. These depending on brake pressure and speed. They also constantly adapt to brake pressure as you are braking. This is why when someone brakes suddenly infront of you and you brake hard you will feel the transmission and engine pulling against the car. If you are traveling along and only apply slight pressure the the brake pedal you will fell very little help from the transmission and engine.

Saying that though it ended up being the Guibo joint. Funny thing is I asked them about this first up. The car was serviced by BMW from the start and I dont understand why it is not part of a normal service at a certain amount of milage.

The reason why I thought it was this is because if I let the car coast along and only applied a light pressure to the brake pedal (so it was like there was tension on the drivetrain) it would change down smoothly and not do it. If I was braking hard (removing the tension from the drivetrain) it would change harshly into 1st.
Any other time you were driving the car up the gears it changed fine. Overtaking someone and accelerated hard it would change back smoothly. Going into D and R it changed smoothly.

I think sometimes BMW takes the opinion that its too hard and just replace it. They also told me they dont rebuild transmission they just replace with new.

I also dont understand why BMW would put a sports orientated gearbox with paddle shift buttons on a luxury vehicle.

Hope this helps someone.
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SKITTSO

2003 735i Titan Silver / Stone Green leather.
2003 525i Toledo Blau / Stone Beige leather.
2005 120i Silver blau / Boston Beige Leather.
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  #2  
Old 05-14-2011, 05:41 AM
BMW Arabia BMW Arabia is offline
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Location: Saudi Arabia
 
Join Date: Apr 2011
Posts: 110
Mein Auto: 750Li 2006
well ... many ppl here did replace the Guibo joint and it didnt work for them !!!
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  #3  
Old 05-14-2011, 06:29 AM
skittso skittso is offline
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Location: Perth, Australia
 
Join Date: Mar 2011
Posts: 36
Mein Auto: BMW 735i E65 2003
I understand that replacing the guibo joint will not be everyones solution. The reason for starting the thread was so everyone could put there solutions to gearbox issues they have had.
I could have replaced the gearbox and still not fixed the problem and been $10,000 out of pocket for the privaledge.
As it was rebuilding the mechatronix cost $4000 and probably didn't need doing. I was just lucky it fell in the 3 month warranty period so the dealer paid.
I just hope that it doesnt get to the stage were we go to the dealer for a misfire and endup having to replace the engine.
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SKITTSO

2003 735i Titan Silver / Stone Green leather.
2003 525i Toledo Blau / Stone Beige leather.
2005 120i Silver blau / Boston Beige Leather.
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  #4  
Old 05-14-2011, 06:31 AM
Lastcombo's Avatar
Lastcombo Lastcombo is offline
Officially Welcomed to the 'Fest
Location: Netherlands Lelystad
 
Join Date: Oct 2010
Posts: 1,878
Mein Auto: BMW745I E65 ,BMW318 IS 94
Quote:
Originally Posted by skittso View Post
I noticed a large amount of threads on problems with tranmissions on these 7's

I thought I might start a thread were we could put down problems we have had with our transmissions and what fixed them.

When I purchased my 735i, 6 months ago it had the usual slam back into 1st.
After visiting the BMW dealer a few times reprogamming, resetting adaptions, changing oils and filter. Was better but still came into 1st badly. Even to the point at one time I swear the back axle was being torn out. They told me it needed a new transmission $10,000.
Went to ZF transmission specialist he rebuilt the Mechatronix on the tranny. It changed up and down smoother but still slamed now and then. I took it back.
I had a large discussion with him about these boxes.

He told me:-

They are very complicated piece of machinery. He went on to say the gearbox itself are fairly bulletproof. You will have very few problems with this section of the box. Providing you change the oil regularly. About every 60,000 to 80,000 kms. The oil level is also critical to be at the right level. Mine had done 138,000kms and inside was like brand new. Most of the problems are with the mechatronix as it is full of ceramic seals and sensors that use hydraulic pressure to change gears. As time goes by these seals absorb oil, wear slightly and sensor become less sensitive not allowing the right amount of pressure for changing gears.
I also read on hear somewere that they have a very complicated electronics system. When we let our foot of the pedal to slow down that these gearboxes are pre-empting what we are going to do. They have 3 different programmes of changing down gears so as to assist slowing the car down. These depending on brake pressure and speed. They also constantly adapt to brake pressure as you are braking. This is why when someone brakes suddenly infront of you and you brake hard you will feel the transmission and engine pulling against the car. If you are traveling along and only apply slight pressure the the brake pedal you will fell very little help from the transmission and engine.

Saying that though it ended up being the Guibo joint. Funny thing is I asked them about this first up. The car was serviced by BMW from the start and I dont understand why it is not part of a normal service at a certain amount of milage.

The reason why I thought it was this is because if I let the car coast along and only applied a light pressure to the brake pedal (so it was like there was tension on the drivetrain) it would change down smoothly and not do it. If I was braking hard (removing the tension from the drivetrain) it would change harshly into 1st.
Any other time you were driving the car up the gears it changed fine. Overtaking someone and accelerated hard it would change back smoothly. Going into D and R it changed smoothly.

I think sometimes BMW takes the opinion that its too hard and just replace it. They also told me they dont rebuild transmission they just replace with new.

I also dont understand why BMW would put a sports orientated gearbox with paddle shift buttons on a luxury vehicle.

Hope this helps someone.
Dealer like to replace parts then actually fixing the problem,i also discovered it lately
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  #5  
Old 05-14-2011, 07:26 AM
hanssae hanssae is offline
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Location: Norway
 
Join Date: Mar 2010
Posts: 98
Mein Auto: 2004 730D
Here is my way to fix it . . . .

http://www.bimmerfest.com/forums/sho...510&highlight=
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  #6  
Old 06-24-2011, 09:12 AM
7SERIESBMW 7SERIESBMW is offline
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Location: Toronto
 
Join Date: Apr 2011
Posts: 75
Mein Auto: 2006 750li
Thanks Hanssae, has this worked for anyone else?
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  #7  
Old 05-20-2014, 03:26 AM
Spin740 Spin740 is offline
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Location: pak
 
Join Date: May 2014
Posts: 2
Mein Auto: Bmw 7 series e65
hello everyone !! i'm new to this forum, recently acquired an e65 740i 2007. the transmission on the car is mad when i'm cruising around say at 30-50 mph when i let my foot of the gas there is a jerking motion that can be felt,the down shifts are rough,rpm spikes and there is a slight power loss at times.I replaced the guibo joint that didn't help,the local bmw shop told me not to replace the tranny oil as it is filled for life.... ANY advice would be appreciated.
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  #8  
Old 07-26-2014, 10:40 AM
TonyLondonUk TonyLondonUk is offline
TonyLondonUk***127468;*** 127463;
Location: London
 
Join Date: Jul 2014
Posts: 21
Mein Auto: 745i
Right Iv done nearly everything this thread said todo, from changing oil & filer in box,
Re checking amount of oil, emptied 1.5Ltrs also purchased a brand new Agm BMW battery, also done the new sleeve &
Adaptor on machatronics, also had it on diagnostic before battery & after batter no errors found involving battery or anything else except for interior light
Iv spent money in this car serviced it well taken care of by indy BMW specialist in London, car is fsh from BMW & 116k on the clock original miles
Iv learnt today that the stabilisers needs changing from well known part suppler 112, but it's not priority car is fine otherwise this gear box over heat problem, I am very close to take a sledge hammer to it, I also did the adaptions 45sec peddle hold down position 2, yes great response & effortless driving, but still the dreadful "trans over heated" error comes up, Iv read dealers are clueless towards it & get there punters to try new battery's 280) then new oil takes 6-7 Ltrs 20 a pop very expensive, also this sleeve & adaptor plug square thing, mine that came out looked perfect I fact better then the new 1 from BMW Direct, the dealer days he needs to check the car, we've had it in diagnostics did all that Iv mentioned & he says he needs to check it still? There's nothing else to check, there is a box that the gearbox oil runs threw a type of radiator located in the engine but I mean why would that go, Iv had the vally pan pipe 6k job sorted thanks to a USA American company that makes an expandable pipe 300 labour 400 done like new problem resolved, Iv had lots of water leaks from hoses & t connectors sorted, Iv changed all the coils, Had full service everything except diff oil There's not much else it needs, oh stabiliser arms 110 each needs doing otherwise car is mint, lots of people are talking about this but Iv not seen 1 person reply & say it has resolved it & this did this that or the other, Iv also not changed the American word guibo, disc adaptor to drive train but I can't can't see how this is causing the overheat problem indy also had a look & it seems fine, plus it's a huge job can't take the risk removing exhaust etc as it won't help plus it's not broken anyway I am lost confused & tearing out my hair this is my only car & it is used daily to & from please please please anyone know it experienced this but has not covered it on this forum for so a reason inbox me or reply as I love my BMW & can't afford a new car or any other car in fact just about having the cash to fix this 1 lots if comments no real help so far please read please help if you have a clue or expectance or if your a BMW tech THANK YOU ***55357;***56852;
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