|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Search | Today's Posts | Mark Forums Read |
|
BMW 3-Series (E90 E92) Forum
>
Auto box feels like it is snatching gears and over revving?
|
|
02-13-2016, 05:54 AM | #1 |
Major General
13161
Rep 7,482
Posts |
Auto box feels like it is snatching gears and over revving?
So this has started this week. Fluid and filter changed at 70k miles. Now well above 90k.
N52B25 with 6AT Sometimes it feels like the car has down shifted without my say so and is hanging in gear. Then I have to let off the gas completely and it goes to the appropriate gear. The best way I can sum it up is that D mode feels like S mode! Any input appreciated ? |
02-13-2016, 09:08 AM | #3 |
Colonel
283
Rep 2,798
Posts |
I'd be looking at 2 things without going to the extent of say having the issue diagnosed as there are 2 possible route causes of the complaint you've highlighted, one is as stated by litany (though inspect the underside before resetting anything)the other is to re look at the gearbox looking from the underside of be re visiting the sump its self and the sleeve. If there is no leakage present and the sumps dry it might be worth re visiting the fluid in the gearbox, if you've done their service and X amounts gone in there is an possibility that there could be a certain shortfall re fluid amount taken by the gearbox.
We spend a fair bit more time maybe than you'd think ensuring as much fluid goes in as possible we've had cars in where the fluids and sump have been changed yet the gearbox though dry doesn't quite feel right when we've to visited the gearbox we've managed to get upto a further litre in after the service has been done. Usually when the service takes place the fluid will be filled until the gearbox starts to welt fluid out and some places will say right that's it plug in wipe off. The key seems to be as we do run the car up (temperature is key here) with someone in he car you run the car through the gears while underneath a second individual is with pump in hand ready to add more fluid again when ready koenwfouoss added as the first fill has had time to circulate the fluids added again until the box spits the second batch of fluid out. Again after this we will run bribe car up always observing the fluid quantity we've used then there maybe a call for a quick third attempt(this will 100% depend on how the fill up procedure has gone previously) then again you'd run the car up check for leaks then the car after covers are re fitted is bought down. ZF supply 7 litres of fluid in their kits and that for a reason on average you'll get anywhere between 5.8 and 6.3 litres of fluid in these boxes there will be differences between one box and and other fact. After this we re set gearbox box adaptations and now engine adaptations and allow the 2 to re acquaint themselves with new fluid possibly less drag and between them the car will find its way. Usually after say 30-50 miles you generally get some idea how it'll drive going forward. |
Appreciate
0
|
02-13-2016, 10:50 AM | #4 |
Lieutenant
71
Rep 552
Posts |
Absolutely what Steve said here. I did my research before doing my box myself after having similar symptoms to you. Mine had been leaking for a while. I really took my time and managed to get about 6 and a third of the seven litre bottles of the ZF fluid in to mine but it took patience. That smoothed changes out straight away. Got around to doing adaptations a few weeks later and the gearbox felt like new. Hope that helps
|
Appreciate
0
|
02-13-2016, 11:57 AM | #5 | |
Major General
13161
Rep 7,482
Posts |
Quote:
|
|
Appreciate
0
|
02-13-2016, 03:07 PM | #6 |
Colonel
283
Rep 2,798
Posts |
Not a problem, but I'd also want to see if there are any gearbox issues recorded to be safe (seen one that had fluid and sump replaced only to have a pre exsisting fault) but chances are what's been highlighted above is the area that will need addressing.
|
Appreciate
0
|
02-18-2016, 09:30 PM | #7 |
Private
5
Rep 93
Posts |
Hey gents
Jumping on this convo, some great advise for the transmission oil change. I'm due to do mine auto box 2009 335i, can one of you be kind enough and point me in the direction where is best to get oil, sump/filter/gasket hoping there is a place to go that supply a kit. Off topic also require final drive oil too.Thankyou |
Appreciate
0
|
02-21-2016, 06:19 AM | #8 | |
Lieutenant
143
Rep 509
Posts |
Quote:
I had an ex-BMW indy tell me to just leave the gearbox well alone unless I actually started noticing any issues. i.e. don't service it for the sake of it. He said that a few times, customers have requested a gearbox service anyway and it's made matters worse as the fluid and "gunk" in there is holding the whole thing together. If you drain that away and service the box, you're just opening yourself up to potential issues. What do you guys recommend to your customers? And if you think a gearbox service is definitely necessary, after how many miles would you say it should be done? |
|
Appreciate
0
|
02-21-2016, 06:21 AM | #9 | |
Lieutenant
143
Rep 509
Posts |
Quote:
Luckily mine's sorted. Good luck! |
|
Appreciate
0
|
02-21-2016, 10:51 AM | #10 | |
Colonel
283
Rep 2,798
Posts |
Quote:
The real shame re all this is although the manufacturer says sealed for life(and they have done so with previous models from the E31's through to say the E39 5 Series's as an example) although the statement stands why can you obtain fluid and filter and sleeve kits from your local BMW parts departments. They know what is going on fact so why continue with the sealed for life statement when it's clear the box cannot meet the statement. I've actually got a 730d coming into me over a 2 day period, it was booked in for us to look at previously but didn't show, on the phone customer reported an all to common story, my advise was to get the car up to me for a look, thinking that by changing the sump and effectivally carrying out the service all being well and if there were no recorded faults in the car, with the recommended service and resetting adaptations it'll live to fight another day. The customer actually didn't turn up for the appointment i'd arranged, but instead went to his local BMW dealer who confirmed the box was indeed leaking, they carried out a diagnosis and the required visual inspection to confirm the leak, then topped it up to the required level and so I was told billed the customer over £250 for. Customer called me to confirm they'd topped up the fluid and the car now drove OK. But what about the leak. Well they'd not done anything re this as they recommended that with fluid in the gearbox the car should be driven to see if it improved matters but confirmed the leak was present but hopefully adding fluid will help. But the leaks still there, the fluid will once again find the leak and then issues will return, then the penny dropped, the procedure is a sticking plaster over a large wound, for me if you see a leak if the cats got mileage you attend to the problem. And thsts not topping up fluid on s component they can see is leaking. If you look at ZF who build the gearbox in their blurb its quite clear that a service is recommended at say 100k's (62.000 miles-from memory)but whatever the figure they'll know their boxes better than anyone else and there advise is servicing is key. Look at Mercedes, gearbox services are built into their service portfolio, like wise VAG Group recommend servicing of their DSG/Auto boxes at specific periods. So yes 100% recommend a service on these boxes say every 4 years maybe 40K(following Mercedes's protocal)to ensure longtem the boxes stand a chance of keeping up with the demands of everyday driving, post work as we've seen recommend re setting adaptations on the gear box as well as the engine so that the 2 can work together and adjust to new fluid and a more free flowing filter. As for your indy not recommending a service I can sort of understand where he's coming from, we work with 3 transmission reconditioners all 100% recommend the procedure for longevity, ZF as you know sell the kits for this very purpose so I think to a degree though I can understand your indy's views they are for whatever reason to me a little wide of the mark, the gunk as you say will eventually create the very issues the service is there to prevent .... a failure Last edited by old grey steve; 02-21-2016 at 11:12 AM.. |
|
Appreciate
2
|
02-21-2016, 04:11 PM | #11 | |
Captain
110
Rep 624
Posts |
Quote:
|
|
Appreciate
0
|
02-21-2016, 06:37 PM | #13 | |
Lieutenant
143
Rep 509
Posts |
Quote:
My wishlist of stuff to do to this car is growing every time I talk to you! Thanks as always for your help! |
|
Appreciate
0
|
Bookmarks |
Thread Tools | Search this Thread |
|
|