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Steptronic Delay after braking, Just me?
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03-27-2009, 12:04 PM | #1 |
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Steptronic Delay after braking, Just me?
I bought a 2007 328xi with the 6sp steptronic, (my 4th BMW first xi), and I discovered a strange transmission behavior. (Thanks to the "angels" in the white van who pulled out in front of me so I could discover this.)
If I'm in drive, going fast enough that the car is in 6th gear, and I have to hit the brakes fairly hard,(slow to 10-20mph) then I immediately floor it, The transmission is extremely slow, and it only downshifts one gear at a time. Before the dealer worked on it I think the NIC was active, because the car seemed to be just coasting as the engine steps up rpm (1000, 1500, more, more, Oh there we go!) From the time I punch it to the time the car gets into 2nd or 1st and takes off well is 3 seconds or more. Here's all the stuff I know so far: I am going to the floor and hitting the kick-down switch Putting it in DS as I'm braking doesn't help. Clearing the adaptations in the transmission helps very little. The dealer talked to BMW, and installed new software in both the DME and the Transmission control unit. It now provides some power as it's downshifting, just not much as it's still in too high a gear. The only thing that does seem to work is using the time I'm braking to go into manual mode and downshift myself. I will try with DSC off and DTC on, then with both off. I don't want to drive like that every time, but it might help isolate the cause. Would someone with an 07 or later 328xi Steptronic try this out for me? Also is there a good OBDII data logger that someone has used that works well. I'd really like to chart exactly what's going on so I can suggest a fix. Thanks in advance |
03-27-2009, 12:48 PM | #3 |
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My wife's car does something similar. 328 xi, auto. Immediately after braking hard the car is a dog. Seems like that's a time when you might want to be able to 'get out of the way', or something similar. We've talked with BMW about it, and haven't had any luck. I'm curious to hear what you find out with this post...
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03-27-2009, 01:20 PM | #5 |
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I'd appreciate it if you'd try this test with her car when you get a chance:
(On a straight lonely road of course!) Bring it up to 45mph in normal drive mode, stop accelerating, wait until it's in top gear (about 1500 rpm), get on the brakes firmly to slow it to 10-15 mph, then immediately floor it. If her car is acting like mine you'll be able to see the transmission leisurely downshift one gear at a time by watching the tach. If it takes about 3-4 seconds we have the same problem. Also see if you can tell if the car is accelerating at all while it's downshifting. I don't think mine was before the dealership reprogrammed it. I see this as a safety issue. I just wanted to get around a moron when I discovered the problem, If I'd had to brake hard on the freeway then just sat there for a while I might have gotten nailed. Also My build date is December 2006, curious about that for hers if her car has the same problem.. |
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03-27-2009, 01:44 PM | #6 |
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Same thing
I just purchased a 07 328xi a few weeks back and have the same issue. I was pulling out of a gas station, rolling at about 5 or 10mph, jammed it to the floor and it hesitated big time before finally going.. It's only done it about 2 times since I've had it but the hesitation is definitely there..
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03-27-2009, 02:30 PM | #7 |
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Try it right after braking. & Build date?
I'd really appreciate it if you'd try it's kickdown right after firm braking next time you're really bored on a straight lonely road.
It's beginning to look like the only folks with this problem are 07 328xi owners, Wouldn't surprise me if it was only the early builds. I want BMW to fix mine. If we can isolate the common aspects we may be able to lean on them a little. I don't have to stand on the brakes, then floor it very often, but it does happen, & I want to be able to get out of the way if I need to. This news article from 2006 http://www.autoracing1.com/htmfiles/...4BMW3Coupe.asp talks about the new 6sp Steptronic & how wonderful it is. (at least for the 335 guys!) Theirs is a -TU for Technically Upgraded. |
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03-28-2009, 02:26 PM | #8 |
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So has anyone tried the test?
I've seen a couple folks indicate they may have the problem, but I haven't had anyone go out and try a 328xi, to see if theirs acts the same.
(Thanks to NoSpleeny for trying it out on his 335xi, The "TU" Steptronic apparently doesn't have the issue.) I want this fixed. If it's only my car, it's broken. If It's all or a subset of 328xi's with Steptronic, BMW should come up with a fix for us all, before someone gets injured or killed for daring to expect their car to go in a reasonable time. The NIC noted in the SIB for 335's jerk on takeoff, may have been part of it. Before the dealer worked on my car, there didn't seem to be any power going to the ground until the final gear choice. Now it accelerates very slowly while it's working it's way down the gears. Thanks in advance. |
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04-05-2009, 07:14 AM | #10 |
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Mine do the same thing 335i 2009.
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04-06-2009, 02:23 PM | #12 |
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Mine does the same thing (335xi), but it is not too bad - lasts less about a second. Switching to DS or using manual mode solves the issue for me.
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04-08-2009, 12:50 PM | #13 |
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I floored it from a standstill and it went away in first gear but the second gear didnt come....it´s a step. It just revved.
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04-10-2009, 03:10 PM | #14 |
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BMWNA Help? I'm Hoping
I've reported the problem to BMW in New Jersey. They initially assigned my e-mail to BMW financial (I have no idea why). So they're going to talk to the service department here. (Oh goody, the place that keeps saying "it's not an M3". Duh it's not a Kia either, they shift properly after braking.....) They may have an engineer look into it.
I hope that doesn't translate to: "We don't want to admit this is in any way bad, or our fault." Great another weekend with this thing still being screwed up. |
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06-02-2009, 05:42 PM | #15 |
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The engineer's "Help"
Bone head from BMW tells me; 1. Well how often do you have to brake hard then floor it. (Just once on the freeway with the truckers doing 75+ may be too many times thanks.) 2. Well there's forces built up that need to be dissipated. (Interesting, what forces? the engine is doing 1000 rpm and I know the wheels are only doing 10 mph. what's left to dissipate?) He didn't know. All I can figure is there is still some valves in the trans that are held in place by hydraulic pressure that needs to be bled off. You'd think of all manufacturers BMW would insist that the transmission works better.
If you've got a 07 or later 328xi, and you have to stand on the brakes, shift into neutral while you're braking. Then you can take off in only 2 seconds, instead of 3+ if you immediately shift into drive at the end of the brake cycle. (Manually shifting down gives you the indication you're in the right gear, but looking at the tach, & the speedo, you know different. What a POS!) Anyone want a 07 CPO'd 328xi? |
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06-03-2009, 11:06 AM | #17 |
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DoltDodger - Sorry - haven't followed this post for a while. I'll try my wife's 2007 328xi in the manner you described. She's certainly had a few interesting moments with her car as well, where it seems for about 3-4 seconds that the car will never start moving, just as you mentioned. I'll try out your prescription.
This lag is THE REASON why I got a manual 328... the AT 335 that I drove was really good (didn't notice this lag at all), but a bit too spendy for me. |
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06-03-2009, 11:10 AM | #18 |
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Wanted to call this out specifically:
For my wife the real issue has been - driving on country road, slowing down to make a turn. Roll through turn onto other road, floor it (b/c there's a BAT coming), and the car leisurely shifts, and again, and again, and again, before really accelerating. This means that by the time the car should have been at 50mph, you're still a sitting duck. Not very pleasant |
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06-03-2009, 03:41 PM | #19 |
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My '07 328Xi did exactly this. Going about 60 mph, traffic in my lane slowed up suddenly and I braked; there was an opening in the lane to my left, so I moved left and punched it and... 2 seconds of the car thinking about it's options and an Audi moving hot up my ass.
This is definitely a safety issue. ETA: I just called my dealer, and they said BMW is working on an update to the software because other drivers have complained about the same thing. |
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06-09-2009, 11:00 PM | #20 | |
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Quote:
SIB 24 09 00 lists the various applications: http://www.bmwtis.com/tsb/bulletins/...p/B240900g.htm
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07-08-2009, 05:37 PM | #22 |
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I think the car settles in on 2nd or 3rd gear after heaving braking when going fast. I don't think the car gears down fast enough. It probably won't happen if you manually engage 1st at a stop. If you try this again and in D, try manually switching it to manual to see which gear your car is engaged in. I think that the cars will be engaged in 2nd for the most part everytime. Not really sure why this is.
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"hard braking", 328xi, 6sp, delay, steptronic |
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