BMW e90 Auto - Gear/power problem
Discussion
Wondered if anyone else has had similar gear/power delivery problems with their e90. It is an intermittent fault but happening more regularly.
When going slowly (say 5-15mph), you decide to put your foot down (sometimes to the floor), rather than accelerating, it feels like the car is trying to change down gear (fair enough) but then fails to select one! I then push my foot all the way to the floor and if left there, zero power is coming for 5+ seconds before it decides to select a gear and away we go. The other way to kick it into life it take foot off pedal and nit it hard again and this springs it into life.
Weirdly, I have noticed it happens more frequently on inclines.
Whilst annoying on a normal road, it is potentially dangerous as it has happened when pulling out of a junction and you decide you need more power only for it to cut out and you are stranded for a couple of seconds before it decides to wake up.
Spark plugs all brand new and the local indy couldnt find anything.
Have tried to search google, etc. but it is such a random problem, I couldnt find anything.
Would welcome any thoughts!!
When going slowly (say 5-15mph), you decide to put your foot down (sometimes to the floor), rather than accelerating, it feels like the car is trying to change down gear (fair enough) but then fails to select one! I then push my foot all the way to the floor and if left there, zero power is coming for 5+ seconds before it decides to select a gear and away we go. The other way to kick it into life it take foot off pedal and nit it hard again and this springs it into life.
Weirdly, I have noticed it happens more frequently on inclines.
Whilst annoying on a normal road, it is potentially dangerous as it has happened when pulling out of a junction and you decide you need more power only for it to cut out and you are stranded for a couple of seconds before it decides to wake up.
Spark plugs all brand new and the local indy couldnt find anything.
Have tried to search google, etc. but it is such a random problem, I couldnt find anything.
Would welcome any thoughts!!
Swervin - Sounds like you have the same issue. You are completely correct re leaving your foot where it is. It is bloomin' annoying. And yes, like yours, no error codes. Will get the trans fluid checked when next in and failing that, it maybe the ZF upgrade thing is needed.
Agree re the theory about going up hills - makes sense.
Just hope that one of the above can fix the issue!
Agree re the theory about going up hills - makes sense.
Just hope that one of the above can fix the issue!
Yip, no rise in revs. Just completely flat like it is idling at best. Mine is the same issue as swervin, it feels like it is trying to kick down a gear but momentarily (can last for a good few seconds sometimes) forgets what to do so you get no drive. People prob think Im break testing them when you decide to accelerate like normal but then stop for a few seconds.
Interestingly, it has never once happened when in DS mode (made because it sets off from 1st more often?? no idea why personalty)
Seems to be one to those 'problems' that few people have, even fewer people know how to rectify and because it is intermittent, you shrug your shoulders and put it down to being a quirk and hope it somehow magically stops doing it!!
Interestingly, it has never once happened when in DS mode (made because it sets off from 1st more often?? no idea why personalty)
Seems to be one to those 'problems' that few people have, even fewer people know how to rectify and because it is intermittent, you shrug your shoulders and put it down to being a quirk and hope it somehow magically stops doing it!!
After writing the post, I found a post talking about 'resetting the auto transmission' which had the benefit of seemingly smoother gear changes and more responsive acceleration (but nothing to do with solving my issue). Anyhow, whilst being sceptical about the claims or indeed having any impact on my issue, I decided to try and as there was no downside.
Well, in the last couple of days I have driven a fair bit, and have to say am somewhat pleased. Not only does it genuinely feel like smoother gear changes etc. (hope it is not the placebo effect!), my old problem has not happened once, this is despite me engineering scenarios where it would most likely happen. What seems to be happening is that because it is more responsive, the gearbox is not waiting to change down a gear and therefore triggering the problem.
Swervin - have you tried this? Would be great to see if this helped solve your issue
Well, in the last couple of days I have driven a fair bit, and have to say am somewhat pleased. Not only does it genuinely feel like smoother gear changes etc. (hope it is not the placebo effect!), my old problem has not happened once, this is despite me engineering scenarios where it would most likely happen. What seems to be happening is that because it is more responsive, the gearbox is not waiting to change down a gear and therefore triggering the problem.
Swervin - have you tried this? Would be great to see if this helped solve your issue
It was merely the accelerator reset 'trick'.
Swervin - don't say that!! I had high hopes that all had been solved!! ;-)
I guess only time will tell.
Indeed, it sounds like HDOG may have solved it as again, those are the same problems and it is interesting that you have not had the same problem in 10k miles.
Swervin - don't say that!! I had high hopes that all had been solved!! ;-)
I guess only time will tell.
Indeed, it sounds like HDOG may have solved it as again, those are the same problems and it is interesting that you have not had the same problem in 10k miles.
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